TY  - JOUR
AU  - Dolić, Maja B.
AU  - Rajaković-Ognjanović, Vladana
AU  - Štrbac, Svetlana B.
AU  - Dimitrijević, Suzana I.
AU  - Mitrić, Miodrag N.
AU  - Onjia, Antonije
AU  - Rajaković, Ljubinka V.
PY  - 2017
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/858
AB  - The objective of this study was to investigate the modification of materials used in wastewater treatment for possible antimicrobial application(s). Granulated activated carbon (GAC) and natural clinoptilolite (CLI) were activated using Cu2+-and Zn2+-ions and the disinfection ability of the resulting materials was tested. Studies of the sorption and desorption kinetics were performed in order to determine and clarify the antimicrobial activity of the metal-activated sorbents. The exact sorption capacities of the selected sorbents, GAC and CLI, activated through use of Cu2+-ions, were 15.90 and 3.60 mg/g, respectively, while for the materials activated by Zn2+-ions, the corresponding capacities were 14.00 and 4.72 mg/g,. The desorption rates were 2 and 3 orders of magnitude lower than their sorption efficacy for the Cu2+-, and Zn2+-activated sorbents, respectively. The intermediate sorption capacity and low desorption rate indicated that the overall antimicrobial activity of the metal-modified sorbents was a result of metal ions immobilized onto surface sites. The effect of antimicrobial activity of free ions desorbed from the metal-activated surface may thus be disregarded. The antimicrobial activities of Cu/GAC, Zn/GAC, Cu/CLI and Zn/ CLI were also tested against Escherichia coli, Staphylococcus aureus, and Candida albicans. After 15 min exposure, the highest levels of cell inactivation were obtained through the Cu/CLI and the Cu/GAC against E. coli, 100.0 and 98.24%, respectively. However, for S. aureus and yeast cell inactivation, all Cu2+-and Zn2+-activated sorbents proved to be unsatisfactory. A characterization of the sorbents was performed by Xray diffraction (XRD), X-ray photo electron spectroscopy (XPS), and field emission scanning electron microscopy (FE-SEM). A concentration of the adsorbed and released ions was determined by inductively coupled plasma-optical emission spectroscopy (ICP-OES) and mass spectrometry (ICP-MS). The results showed that the antimicrobial performance of the activated sorbents depended on the surface characteristics of the material, which itself designates the distribution and the bioavailability of the activating agent.
PB  - Elsevier B.V.
T2  - New Biotechnology
T1  - Natural sorbents modified by divalent Cu2+- and Zn2+- ions and their corresponding antimicrobial activity
EP  - 159
SP  - 150
VL  - 39
DO  - 10.1016/j.nbt.2017.03.001
ER  - 

@article{
author = "Dolić, Maja B. and Rajaković-Ognjanović, Vladana and Štrbac, Svetlana B. and Dimitrijević, Suzana I. and Mitrić, Miodrag N. and Onjia, Antonije and Rajaković, Ljubinka V.",
year = "2017",
abstract = "The objective of this study was to investigate the modification of materials used in wastewater treatment for possible antimicrobial application(s). Granulated activated carbon (GAC) and natural clinoptilolite (CLI) were activated using Cu2+-and Zn2+-ions and the disinfection ability of the resulting materials was tested. Studies of the sorption and desorption kinetics were performed in order to determine and clarify the antimicrobial activity of the metal-activated sorbents. The exact sorption capacities of the selected sorbents, GAC and CLI, activated through use of Cu2+-ions, were 15.90 and 3.60 mg/g, respectively, while for the materials activated by Zn2+-ions, the corresponding capacities were 14.00 and 4.72 mg/g,. The desorption rates were 2 and 3 orders of magnitude lower than their sorption efficacy for the Cu2+-, and Zn2+-activated sorbents, respectively. The intermediate sorption capacity and low desorption rate indicated that the overall antimicrobial activity of the metal-modified sorbents was a result of metal ions immobilized onto surface sites. The effect of antimicrobial activity of free ions desorbed from the metal-activated surface may thus be disregarded. The antimicrobial activities of Cu/GAC, Zn/GAC, Cu/CLI and Zn/ CLI were also tested against Escherichia coli, Staphylococcus aureus, and Candida albicans. After 15 min exposure, the highest levels of cell inactivation were obtained through the Cu/CLI and the Cu/GAC against E. coli, 100.0 and 98.24%, respectively. However, for S. aureus and yeast cell inactivation, all Cu2+-and Zn2+-activated sorbents proved to be unsatisfactory. A characterization of the sorbents was performed by Xray diffraction (XRD), X-ray photo electron spectroscopy (XPS), and field emission scanning electron microscopy (FE-SEM). A concentration of the adsorbed and released ions was determined by inductively coupled plasma-optical emission spectroscopy (ICP-OES) and mass spectrometry (ICP-MS). The results showed that the antimicrobial performance of the activated sorbents depended on the surface characteristics of the material, which itself designates the distribution and the bioavailability of the activating agent.",
publisher = "Elsevier B.V.",
journal = "New Biotechnology",
title = "Natural sorbents modified by divalent Cu2+- and Zn2+- ions and their corresponding antimicrobial activity",
pages = "159-150",
volume = "39",
doi = "10.1016/j.nbt.2017.03.001"
}

Dolić, M. B., Rajaković-Ognjanović, V., Štrbac, S. B., Dimitrijević, S. I., Mitrić, M. N., Onjia, A.,& Rajaković, L. V.. (2017). Natural sorbents modified by divalent Cu2+- and Zn2+- ions and their corresponding antimicrobial activity. in New Biotechnology
Elsevier B.V.., 39, 150-159.
https://doi.org/10.1016/j.nbt.2017.03.001

Dolić MB, Rajaković-Ognjanović V, Štrbac SB, Dimitrijević SI, Mitrić MN, Onjia A, Rajaković LV. Natural sorbents modified by divalent Cu2+- and Zn2+- ions and their corresponding antimicrobial activity. in New Biotechnology. 2017;39:150-159.
doi:10.1016/j.nbt.2017.03.001 .

Dolić, Maja B., Rajaković-Ognjanović, Vladana, Štrbac, Svetlana B., Dimitrijević, Suzana I., Mitrić, Miodrag N., Onjia, Antonije, Rajaković, Ljubinka V., "Natural sorbents modified by divalent Cu2+- and Zn2+- ions and their corresponding antimicrobial activity" in New Biotechnology, 39 (2017):150-159,
https://doi.org/10.1016/j.nbt.2017.03.001 . .

TY  - JOUR
AU  - Dolić, Maja B.
AU  - Rajaković-Ognjanović, Vladana
AU  - Štrbac, Svetlana B.
AU  - Rakočević, Zlatko Lj.
AU  - Veljović, Đorđe
AU  - Dimitrijević, Suzana I.
AU  - Rajaković, Ljubinka V.
PY  - 2015
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/723
AB  - This study is focused on the surface modifications of the materials that are used for antimicrobial water treatment. Sorbents of different origin were activated by Ag+-ions. The selection of the most appropriate materials and the most effective activation agents was done according to the results of the sorption and desorption kinetic studies. Sorption capacities of selected sorbents: granulated activated carbon (GAC), zeolite (Z), and titanium dioxide (T), activated by Ag+-ions were following: 42.06, 13.51 and 17.53 mg/g, respectively. The antimicrobial activity of Ag/Z, Ag/GAC and Ag/T sorbents were tested against Gram-negative bacteria E. coli, Gram-positive bacteria S. aureus and yeast C. albicans. After 15 min of exposure period, the highest cell removal was obtained using Ag/Z against S. aureus and E. coli, 98.8 and 93.5%, respectively. Yeast cell inactivation was unsatisfactory for all three activated sorbents. The antimicrobial pathway of the activated sorbents has been examined by two separate tests - Ag+-ions desorbed from the activated surface to the aqueous phase and microbial cell removal caused by the Ag+-ions from the solid phase (activated surface sites). The results indicated that disinfection process significantly depended on the microbial-activated sites interactions on the modified surface. The chemical state of the activating agent had crucial impact to the inhibition rate. The characterization of the native and modified sorbents was performed by X-ray diffraction technique, X-ray photoelectron spectroscopy and scanning electron microscope. The concentration of adsorbed and released ions was determined by inductively coupled plasma optical emission spectroscopy and mass spectrometry. The antimicrobial efficiency of activated sorbents was related not only to the concentration of the activating agent, but moreover on the surface characteristics of the material, which affects the distribution and the accessibility of the activating agent.
PB  - Elsevier B.V.
T2  - Applied Surface Science
T1  - The antimicrobial efficiency of silver activated sorbents
EP  - 831
SP  - 819
VL  - 357
DO  - 10.1016/j.apsusc.2015.09.032
ER  - 

@article{
author = "Dolić, Maja B. and Rajaković-Ognjanović, Vladana and Štrbac, Svetlana B. and Rakočević, Zlatko Lj. and Veljović, Đorđe and Dimitrijević, Suzana I. and Rajaković, Ljubinka V.",
year = "2015",
abstract = "This study is focused on the surface modifications of the materials that are used for antimicrobial water treatment. Sorbents of different origin were activated by Ag+-ions. The selection of the most appropriate materials and the most effective activation agents was done according to the results of the sorption and desorption kinetic studies. Sorption capacities of selected sorbents: granulated activated carbon (GAC), zeolite (Z), and titanium dioxide (T), activated by Ag+-ions were following: 42.06, 13.51 and 17.53 mg/g, respectively. The antimicrobial activity of Ag/Z, Ag/GAC and Ag/T sorbents were tested against Gram-negative bacteria E. coli, Gram-positive bacteria S. aureus and yeast C. albicans. After 15 min of exposure period, the highest cell removal was obtained using Ag/Z against S. aureus and E. coli, 98.8 and 93.5%, respectively. Yeast cell inactivation was unsatisfactory for all three activated sorbents. The antimicrobial pathway of the activated sorbents has been examined by two separate tests - Ag+-ions desorbed from the activated surface to the aqueous phase and microbial cell removal caused by the Ag+-ions from the solid phase (activated surface sites). The results indicated that disinfection process significantly depended on the microbial-activated sites interactions on the modified surface. The chemical state of the activating agent had crucial impact to the inhibition rate. The characterization of the native and modified sorbents was performed by X-ray diffraction technique, X-ray photoelectron spectroscopy and scanning electron microscope. The concentration of adsorbed and released ions was determined by inductively coupled plasma optical emission spectroscopy and mass spectrometry. The antimicrobial efficiency of activated sorbents was related not only to the concentration of the activating agent, but moreover on the surface characteristics of the material, which affects the distribution and the accessibility of the activating agent.",
publisher = "Elsevier B.V.",
journal = "Applied Surface Science",
title = "The antimicrobial efficiency of silver activated sorbents",
pages = "831-819",
volume = "357",
doi = "10.1016/j.apsusc.2015.09.032"
}

Dolić, M. B., Rajaković-Ognjanović, V., Štrbac, S. B., Rakočević, Z. Lj., Veljović, Đ., Dimitrijević, S. I.,& Rajaković, L. V.. (2015). The antimicrobial efficiency of silver activated sorbents. in Applied Surface Science
Elsevier B.V.., 357, 819-831.
https://doi.org/10.1016/j.apsusc.2015.09.032

Dolić MB, Rajaković-Ognjanović V, Štrbac SB, Rakočević ZL, Veljović Đ, Dimitrijević SI, Rajaković LV. The antimicrobial efficiency of silver activated sorbents. in Applied Surface Science. 2015;357:819-831.
doi:10.1016/j.apsusc.2015.09.032 .

Dolić, Maja B., Rajaković-Ognjanović, Vladana, Štrbac, Svetlana B., Rakočević, Zlatko Lj., Veljović, Đorđe, Dimitrijević, Suzana I., Rajaković, Ljubinka V., "The antimicrobial efficiency of silver activated sorbents" in Applied Surface Science, 357 (2015):819-831,
https://doi.org/10.1016/j.apsusc.2015.09.032 . .

TY  - JOUR
AU  - Dolić, Maja B.
AU  - Rajaković-Ognjanović, Vladana
AU  - Marković, Jelena P.
AU  - Jankovic-Mandić, Ljiljana J.
AU  - Mitrić, Miodrag N.
AU  - Onjia, Antonije
AU  - Rajaković, Ljubinka V.
PY  - 2015
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/705
AB  - Natural minerals, such as quartz, clinoptilolite and calcite, are useful as sorbents for various applications, but their content of heavy metals ions is the most problematic obstacle to their application. Before their (re)use, the minerals must be purified. In this work, the subject was desorption of lead from a natural multi-component mineral sample consisting of a mixture of silicates (mainly quartz and clinoptilolite) and calcite formations. Besides deionized water, different extraction solutions were tested: NaCl, KCl, CaCl2, MgCl2, HCl, HNO3, EDTA, EDTA/HCl, EDTA/NaOAc-HOAc, HOAc, NaOAc and NaOAc-HOAc. Several parameters were varied in order to obtain the optimal conditions for the desorption process: the concentration of the extraction solution, the ratio of the mass of the sample and volume of the extractant, and the pH value of the suspension. The best purification effect in one desorption cycle was obtained when 0.1 M EDTA, at a pH value of 3.5 (0.2 M EDTA was mixed with 0.01 M acetic buffer, at pH value 3.0, in ratio 1:1) was applied. Sequential extraction (5 consecutive iterations) was performed to provide a more efficient purification process. The lead content (58.20 mg/kg) was decreased by: 20% (using HOAc), 21% (using EDTA) and by more than 50% (using EDTA/NaOAc-HOAc). The pH value and conductivity were measured at all critical points to clarify the mechanism of the desorption process. The formation of Pb-EDTA complex is the result of two parallel phenomena, complexing and ion-exchange. An enhanced adsorption capacity and an improved microelement profile for the purified samples were also attained. The mineralogical and radiochemical performances of the sample were determined by the X-ray diffraction and gamma spectrometry techniques. Microelement analyses of the native and purified samples were performed by inductively coupled plasma optical emission spectroscopy (ICP-OES).
PB  - Elsevier B.V.
T2  - Applied Surface Science
T1  - The effect of different extractants on lead desorption from a natural mineral
EP  - 231
SP  - 221
VL  - 324
DO  - 10.1016/j.apsusc.2014.10.112
ER  - 

@article{
author = "Dolić, Maja B. and Rajaković-Ognjanović, Vladana and Marković, Jelena P. and Jankovic-Mandić, Ljiljana J. and Mitrić, Miodrag N. and Onjia, Antonije and Rajaković, Ljubinka V.",
year = "2015",
abstract = "Natural minerals, such as quartz, clinoptilolite and calcite, are useful as sorbents for various applications, but their content of heavy metals ions is the most problematic obstacle to their application. Before their (re)use, the minerals must be purified. In this work, the subject was desorption of lead from a natural multi-component mineral sample consisting of a mixture of silicates (mainly quartz and clinoptilolite) and calcite formations. Besides deionized water, different extraction solutions were tested: NaCl, KCl, CaCl2, MgCl2, HCl, HNO3, EDTA, EDTA/HCl, EDTA/NaOAc-HOAc, HOAc, NaOAc and NaOAc-HOAc. Several parameters were varied in order to obtain the optimal conditions for the desorption process: the concentration of the extraction solution, the ratio of the mass of the sample and volume of the extractant, and the pH value of the suspension. The best purification effect in one desorption cycle was obtained when 0.1 M EDTA, at a pH value of 3.5 (0.2 M EDTA was mixed with 0.01 M acetic buffer, at pH value 3.0, in ratio 1:1) was applied. Sequential extraction (5 consecutive iterations) was performed to provide a more efficient purification process. The lead content (58.20 mg/kg) was decreased by: 20% (using HOAc), 21% (using EDTA) and by more than 50% (using EDTA/NaOAc-HOAc). The pH value and conductivity were measured at all critical points to clarify the mechanism of the desorption process. The formation of Pb-EDTA complex is the result of two parallel phenomena, complexing and ion-exchange. An enhanced adsorption capacity and an improved microelement profile for the purified samples were also attained. The mineralogical and radiochemical performances of the sample were determined by the X-ray diffraction and gamma spectrometry techniques. Microelement analyses of the native and purified samples were performed by inductively coupled plasma optical emission spectroscopy (ICP-OES).",
publisher = "Elsevier B.V.",
journal = "Applied Surface Science",
title = "The effect of different extractants on lead desorption from a natural mineral",
pages = "231-221",
volume = "324",
doi = "10.1016/j.apsusc.2014.10.112"
}

Dolić, M. B., Rajaković-Ognjanović, V., Marković, J. P., Jankovic-Mandić, L. J., Mitrić, M. N., Onjia, A.,& Rajaković, L. V.. (2015). The effect of different extractants on lead desorption from a natural mineral. in Applied Surface Science
Elsevier B.V.., 324, 221-231.
https://doi.org/10.1016/j.apsusc.2014.10.112

Dolić MB, Rajaković-Ognjanović V, Marković JP, Jankovic-Mandić LJ, Mitrić MN, Onjia A, Rajaković LV. The effect of different extractants on lead desorption from a natural mineral. in Applied Surface Science. 2015;324:221-231.
doi:10.1016/j.apsusc.2014.10.112 .

Dolić, Maja B., Rajaković-Ognjanović, Vladana, Marković, Jelena P., Jankovic-Mandić, Ljiljana J., Mitrić, Miodrag N., Onjia, Antonije, Rajaković, Ljubinka V., "The effect of different extractants on lead desorption from a natural mineral" in Applied Surface Science, 324 (2015):221-231,
https://doi.org/10.1016/j.apsusc.2014.10.112 . .

TY  - JOUR
AU  - Rajaković-Ognjanović, Vladana
AU  - Lekić, Branislava
AU  - Živojinović, Dragana Z.
AU  - Rajaković, Ljubinka V.
PY  - 2014
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/620
AB  - Analysis and monitoring of arsenic is still a challenging analytical task. Due to its complex behaviour (different forms of arsenic that can be present depending on pH and oxidation states of arsenic) as well as demanding analytical procedures and instrumental tools for control of arsenic concentration in drinking water which is set to 10 mu g L-1, there are still some open questions and issues when arsenic is the scientific topic. In this paper the idea was to use a multivariate statistical approach to identify the key variables and their relation to high arsenic concentration in surface waters of Serbia. The main idea was to identify and connect the key water quality parameters with arsenic concentration and to suggest adequate treatment technologies for water purification and arsenic removal. The data set for multivariate statistical approach were water quality parameters of surface water samples from Serbia. The artificial neural network (ANN) was applied for data analysis. After applying ANN the results showed strong relation between arsenic concentration and P-tot, SO42-, COD, carbonate, N-org, DO, and SiO2 content. What could be concluded from the obtained results is that high concentration of organic matter, proportional to nutrients (nitrogen and phosphorus), silica (SiO2) and dissolved oxygen highly correlates with the dissolved arsenic which implies that the most adequate technology for the water treatment could be precipitation, which in general includes coagulation. What remains unquestioned and needs to be performed is arsenic speciation analysis.
T2  - Environmental Engineering and Management Journal
T1  - Challenging analytical task: analysis and monitoring of arsenic species in water
EP  - 2282
IS  - 9
SP  - 2275
VL  - 13
DO  - 10.30638/eemj.2014.254
ER  - 

@article{
author = "Rajaković-Ognjanović, Vladana and Lekić, Branislava and Živojinović, Dragana Z. and Rajaković, Ljubinka V.",
year = "2014",
abstract = "Analysis and monitoring of arsenic is still a challenging analytical task. Due to its complex behaviour (different forms of arsenic that can be present depending on pH and oxidation states of arsenic) as well as demanding analytical procedures and instrumental tools for control of arsenic concentration in drinking water which is set to 10 mu g L-1, there are still some open questions and issues when arsenic is the scientific topic. In this paper the idea was to use a multivariate statistical approach to identify the key variables and their relation to high arsenic concentration in surface waters of Serbia. The main idea was to identify and connect the key water quality parameters with arsenic concentration and to suggest adequate treatment technologies for water purification and arsenic removal. The data set for multivariate statistical approach were water quality parameters of surface water samples from Serbia. The artificial neural network (ANN) was applied for data analysis. After applying ANN the results showed strong relation between arsenic concentration and P-tot, SO42-, COD, carbonate, N-org, DO, and SiO2 content. What could be concluded from the obtained results is that high concentration of organic matter, proportional to nutrients (nitrogen and phosphorus), silica (SiO2) and dissolved oxygen highly correlates with the dissolved arsenic which implies that the most adequate technology for the water treatment could be precipitation, which in general includes coagulation. What remains unquestioned and needs to be performed is arsenic speciation analysis.",
journal = "Environmental Engineering and Management Journal",
title = "Challenging analytical task: analysis and monitoring of arsenic species in water",
pages = "2282-2275",
number = "9",
volume = "13",
doi = "10.30638/eemj.2014.254"
}

Rajaković-Ognjanović, V., Lekić, B., Živojinović, D. Z.,& Rajaković, L. V.. (2014). Challenging analytical task: analysis and monitoring of arsenic species in water. in Environmental Engineering and Management Journal, 13(9), 2275-2282.
https://doi.org/10.30638/eemj.2014.254

Rajaković-Ognjanović V, Lekić B, Živojinović DZ, Rajaković LV. Challenging analytical task: analysis and monitoring of arsenic species in water. in Environmental Engineering and Management Journal. 2014;13(9):2275-2282.
doi:10.30638/eemj.2014.254 .

Rajaković-Ognjanović, Vladana, Lekić, Branislava, Živojinović, Dragana Z., Rajaković, Ljubinka V., "Challenging analytical task: analysis and monitoring of arsenic species in water" in Environmental Engineering and Management Journal, 13, no. 9 (2014):2275-2282,
https://doi.org/10.30638/eemj.2014.254 . .

TY  - JOUR
AU  - Ilić, Nikola I.
AU  - Lazarević, Slavica S.
AU  - Rajaković-Ognjanović, Vladana
AU  - Rajaković, Ljubinka V.
AU  - Janacković, Đorđe T.
AU  - Petrović, Rada D.
PY  - 2014
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/611
AB  - The sorption of inorganic arsenic species, As(III) and As(V), from water by sepiolite modified with hydrated iron(III) oxide was investigated at 25 degrees C through batch studies. The influence of the initial pH value, the initial As concentration, the contact time and the type of water on the sorption capacity was investigated. Two types of water were used, deionised and groundwater. The maximal sorption capacity for As(III) dissolved in deionised water was observed at an initial and final pH value 7.0, while the bonding of As(V) was observed to be almost pH independent for pH value in the range from 2.0 to 7.0, while a significant decrease in the sorption capacity was observed at pH values above 7.0. The sorption capacity at initial pH 7.0 was about 10 mg g(-1) for As(III) and 4.2 mg g(-1) for As(V) in deionised water. The capacity in groundwater was decreased by 40 % for As(III) and by 20 % for As(V). The Langmuir model and pseudo-second order kinetic model revealed good agreement with the experimental results. The results showed that Fe(III)-modified sepiolite exhibits significant affinity for arsenic removal and it has the potential for application in water purification processes.
PB  - Srpsko hemijsko društvo, Beograd
T2  - Journal of the Serbian Chemical Society
T1  - The sorption of inorganic arsenic on modified sepiolite: the effect of hydrated iron(III) oxide
EP  - 828
IS  - 7
SP  - 815
VL  - 79
DO  - 10.2298/JSC130912017I
ER  - 

@article{
author = "Ilić, Nikola I. and Lazarević, Slavica S. and Rajaković-Ognjanović, Vladana and Rajaković, Ljubinka V. and Janacković, Đorđe T. and Petrović, Rada D.",
year = "2014",
abstract = "The sorption of inorganic arsenic species, As(III) and As(V), from water by sepiolite modified with hydrated iron(III) oxide was investigated at 25 degrees C through batch studies. The influence of the initial pH value, the initial As concentration, the contact time and the type of water on the sorption capacity was investigated. Two types of water were used, deionised and groundwater. The maximal sorption capacity for As(III) dissolved in deionised water was observed at an initial and final pH value 7.0, while the bonding of As(V) was observed to be almost pH independent for pH value in the range from 2.0 to 7.0, while a significant decrease in the sorption capacity was observed at pH values above 7.0. The sorption capacity at initial pH 7.0 was about 10 mg g(-1) for As(III) and 4.2 mg g(-1) for As(V) in deionised water. The capacity in groundwater was decreased by 40 % for As(III) and by 20 % for As(V). The Langmuir model and pseudo-second order kinetic model revealed good agreement with the experimental results. The results showed that Fe(III)-modified sepiolite exhibits significant affinity for arsenic removal and it has the potential for application in water purification processes.",
publisher = "Srpsko hemijsko društvo, Beograd",
journal = "Journal of the Serbian Chemical Society",
title = "The sorption of inorganic arsenic on modified sepiolite: the effect of hydrated iron(III) oxide",
pages = "828-815",
number = "7",
volume = "79",
doi = "10.2298/JSC130912017I"
}

Ilić, N. I., Lazarević, S. S., Rajaković-Ognjanović, V., Rajaković, L. V., Janacković, Đ. T.,& Petrović, R. D.. (2014). The sorption of inorganic arsenic on modified sepiolite: the effect of hydrated iron(III) oxide. in Journal of the Serbian Chemical Society
Srpsko hemijsko društvo, Beograd., 79(7), 815-828.
https://doi.org/10.2298/JSC130912017I

Ilić NI, Lazarević SS, Rajaković-Ognjanović V, Rajaković LV, Janacković ĐT, Petrović RD. The sorption of inorganic arsenic on modified sepiolite: the effect of hydrated iron(III) oxide. in Journal of the Serbian Chemical Society. 2014;79(7):815-828.
doi:10.2298/JSC130912017I .

Ilić, Nikola I., Lazarević, Slavica S., Rajaković-Ognjanović, Vladana, Rajaković, Ljubinka V., Janacković, Đorđe T., Petrović, Rada D., "The sorption of inorganic arsenic on modified sepiolite: the effect of hydrated iron(III) oxide" in Journal of the Serbian Chemical Society, 79, no. 7 (2014):815-828,
https://doi.org/10.2298/JSC130912017I . .

TY  - JOUR
AU  - Marković, Dana D.
AU  - Lekić, Branislava
AU  - Rajaković-Ognjanović, Vladana
AU  - Onjia, Antonije
AU  - Rajaković, Ljubinka V.
PY  - 2014
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/622
AB  - Numerous regression approaches to isotherm parameters estimation appear in the literature. The real insight into the proper modeling pattern can be achieved only by testing methods on a very big number of cases. Experimentally, it cannot be done in a reasonable time, so the Monte Carlo simulation method was applied. The objective of this paper is to introduce and compare numerical approaches that involve different levels of knowledge about the noise structure of the analytical method used for initial and equilibrium concentration determination. Six levels of homoscedastic noise and five types of heteroscedastic noise precision models were considered. Performance of the methods was statistically evaluated based on median percentage error and mean absolute relative error in parameter estimates. The present study showed a clear distinction between two cases. When equilibrium experiments are performed only once, for the homoscedastic case, the winning error function is ordinary least squares, while for the case of heteroscedastic noise the use of orthogonal distance regression or Margart's percent standard deviation is suggested. It was found that in case when experiments are repeated three times the simple method of weighted least squares performed as well as more complicated orthogonal distance regression method.
T2  - Scientific World Journal
T1  - A New Approach in Regression Analysis for Modeling Adsorption Isotherms
DO  - 10.1155/2014/930879
ER  - 

@article{
author = "Marković, Dana D. and Lekić, Branislava and Rajaković-Ognjanović, Vladana and Onjia, Antonije and Rajaković, Ljubinka V.",
year = "2014",
abstract = "Numerous regression approaches to isotherm parameters estimation appear in the literature. The real insight into the proper modeling pattern can be achieved only by testing methods on a very big number of cases. Experimentally, it cannot be done in a reasonable time, so the Monte Carlo simulation method was applied. The objective of this paper is to introduce and compare numerical approaches that involve different levels of knowledge about the noise structure of the analytical method used for initial and equilibrium concentration determination. Six levels of homoscedastic noise and five types of heteroscedastic noise precision models were considered. Performance of the methods was statistically evaluated based on median percentage error and mean absolute relative error in parameter estimates. The present study showed a clear distinction between two cases. When equilibrium experiments are performed only once, for the homoscedastic case, the winning error function is ordinary least squares, while for the case of heteroscedastic noise the use of orthogonal distance regression or Margart's percent standard deviation is suggested. It was found that in case when experiments are repeated three times the simple method of weighted least squares performed as well as more complicated orthogonal distance regression method.",
journal = "Scientific World Journal",
title = "A New Approach in Regression Analysis for Modeling Adsorption Isotherms",
doi = "10.1155/2014/930879"
}

Marković, D. D., Lekić, B., Rajaković-Ognjanović, V., Onjia, A.,& Rajaković, L. V.. (2014). A New Approach in Regression Analysis for Modeling Adsorption Isotherms. in Scientific World Journal.
https://doi.org/10.1155/2014/930879

Marković DD, Lekić B, Rajaković-Ognjanović V, Onjia A, Rajaković LV. A New Approach in Regression Analysis for Modeling Adsorption Isotherms. in Scientific World Journal. 2014;.
doi:10.1155/2014/930879 .

Marković, Dana D., Lekić, Branislava, Rajaković-Ognjanović, Vladana, Onjia, Antonije, Rajaković, Ljubinka V., "A New Approach in Regression Analysis for Modeling Adsorption Isotherms" in Scientific World Journal (2014),
https://doi.org/10.1155/2014/930879 . .

TY  - JOUR
AU  - Mirković, Maja
AU  - Lekić, Branislava
AU  - Rajaković-Ognjanović, Vladana
AU  - Jankovic-Mandić, Ljiljana J.
AU  - Jović, Mihajlo
AU  - Onjia, Antonije
AU  - Rajaković, Ljubinka V.
PY  - 2014
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/1024
T2  - Ecologica
T1  - Mogućnosti primene sorbenata aktiviranih jonima metala za mikrobiološko precišćavanje vode
EP  - 795
IS  - 76
SP  - 791
VL  - 21
UR  - https://hdl.handle.net/21.15107/rcub_grafar_1024
ER  - 

@article{
author = "Mirković, Maja and Lekić, Branislava and Rajaković-Ognjanović, Vladana and Jankovic-Mandić, Ljiljana J. and Jović, Mihajlo and Onjia, Antonije and Rajaković, Ljubinka V.",
year = "2014",
journal = "Ecologica",
title = "Mogućnosti primene sorbenata aktiviranih jonima metala za mikrobiološko precišćavanje vode",
pages = "795-791",
number = "76",
volume = "21",
url = "https://hdl.handle.net/21.15107/rcub_grafar_1024"
}

Mirković, M., Lekić, B., Rajaković-Ognjanović, V., Jankovic-Mandić, L. J., Jović, M., Onjia, A.,& Rajaković, L. V.. (2014). Mogućnosti primene sorbenata aktiviranih jonima metala za mikrobiološko precišćavanje vode. in Ecologica, 21(76), 791-795.
https://hdl.handle.net/21.15107/rcub_grafar_1024

Mirković M, Lekić B, Rajaković-Ognjanović V, Jankovic-Mandić LJ, Jović M, Onjia A, Rajaković LV. Mogućnosti primene sorbenata aktiviranih jonima metala za mikrobiološko precišćavanje vode. in Ecologica. 2014;21(76):791-795.
https://hdl.handle.net/21.15107/rcub_grafar_1024 .

Mirković, Maja, Lekić, Branislava, Rajaković-Ognjanović, Vladana, Jankovic-Mandić, Ljiljana J., Jović, Mihajlo, Onjia, Antonije, Rajaković, Ljubinka V., "Mogućnosti primene sorbenata aktiviranih jonima metala za mikrobiološko precišćavanje vode" in Ecologica, 21, no. 76 (2014):791-795,
https://hdl.handle.net/21.15107/rcub_grafar_1024 .

TY  - JOUR
AU  - Lekić, Branislava
AU  - Marković, Dana D.
AU  - Rajaković-Ognjanović, Vladana
AU  - Đukić, Aleksandar
AU  - Rajaković, Ljubinka V.
PY  - 2013
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/531
AB  - In this study, removal of arsenic ions using two industrial by-products as adsorbents is represented. Removal of As(III) and As(V) from water was carried out with industrial by-products: residual from the groundwater treatment process, iron-manganese oxide coated sand (IMOCS), and blast furnace slag from steel production (BFS), both inexpensive and locally available. In addition, the BFS was modified in order to minimise its deteriorating impact on the initial water quality. Kinetic and equilibrium studies were carried out using batch and fixed-bed column adsorption techniques under the conditions that are likely to occur in real water treatment systems. To evaluate the application for real groundwater treatment, the capacities of the selected materials were further compared to those exhibited by commercial sorbents, which were examined under the same experimental conditions. IMOCS was found to be a good and inexpensive sorbent for arsenic, while BFS and modified slag showed the highest affinity towards arsenic. All examined waste materials exhibited better sorption performances for As(V). The maximum sorption capacity in the batch reactor was obtained for blast furnace slag, 4040 mu gAs(V)/g.
PB  - Hindawi Limited
T2  - Journal of Chemistry
T1  - Arsenic Removal from Water Using Industrial By-Products
DO  - 10.1155/2013/121024
ER  - 

@article{
author = "Lekić, Branislava and Marković, Dana D. and Rajaković-Ognjanović, Vladana and Đukić, Aleksandar and Rajaković, Ljubinka V.",
year = "2013",
abstract = "In this study, removal of arsenic ions using two industrial by-products as adsorbents is represented. Removal of As(III) and As(V) from water was carried out with industrial by-products: residual from the groundwater treatment process, iron-manganese oxide coated sand (IMOCS), and blast furnace slag from steel production (BFS), both inexpensive and locally available. In addition, the BFS was modified in order to minimise its deteriorating impact on the initial water quality. Kinetic and equilibrium studies were carried out using batch and fixed-bed column adsorption techniques under the conditions that are likely to occur in real water treatment systems. To evaluate the application for real groundwater treatment, the capacities of the selected materials were further compared to those exhibited by commercial sorbents, which were examined under the same experimental conditions. IMOCS was found to be a good and inexpensive sorbent for arsenic, while BFS and modified slag showed the highest affinity towards arsenic. All examined waste materials exhibited better sorption performances for As(V). The maximum sorption capacity in the batch reactor was obtained for blast furnace slag, 4040 mu gAs(V)/g.",
publisher = "Hindawi Limited",
journal = "Journal of Chemistry",
title = "Arsenic Removal from Water Using Industrial By-Products",
doi = "10.1155/2013/121024"
}

Lekić, B., Marković, D. D., Rajaković-Ognjanović, V., Đukić, A.,& Rajaković, L. V.. (2013). Arsenic Removal from Water Using Industrial By-Products. in Journal of Chemistry
Hindawi Limited..
https://doi.org/10.1155/2013/121024

Lekić B, Marković DD, Rajaković-Ognjanović V, Đukić A, Rajaković LV. Arsenic Removal from Water Using Industrial By-Products. in Journal of Chemistry. 2013;.
doi:10.1155/2013/121024 .

Lekić, Branislava, Marković, Dana D., Rajaković-Ognjanović, Vladana, Đukić, Aleksandar, Rajaković, Ljubinka V., "Arsenic Removal from Water Using Industrial By-Products" in Journal of Chemistry (2013),
https://doi.org/10.1155/2013/121024 . .

TY  - JOUR
AU  - Živojinović, Dragana Z.
AU  - Rajaković-Ognjanović, Vladana
AU  - Onjia, Antonije
AU  - Rajaković, Ljubinka V.
PY  - 2013
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/523
AB  - In this study, a multivariate statistical approach was used to identify the key variables responsible for process water quality in a power plant. The ion species that could cause corrosion in one of the major thermal power plants (TPP) in Serbia were monitored. A suppressed ion chromatographic (IC) method for the determination of the target anions and cations at trace levels was applied. In addition, some metals important for corrosion, i.e., copper and iron, were also analysed by the graphite furnace atomic absorption spectrophotometric (GFAAS) method. The control parameters, i.e., pH, dissolved oxygen and silica, were measured on-line. The analysis of a series of representative samples from the TPP Nikola Tesla, collected in different plant operation modes, was performed. Every day laboratory and on-line analysis provides a large number of data in relation to the quality of water in the water-steam cycle (WSC) which should be evaluated and processed. The goal of this investigation was to apply multivariate statistical techniques and choose the most applicable technique for this case. Factor analysis (FA), especially principal component analysis (PCA) and cluster analysis (CA) were investigated. These methods were applied for the evaluation of the spatial/temporal variations of process water and for the estimation of 13 quality parameters which were monitored at 11 locations in the WSC in different working conditions during a twelve month period. It was concluded that PCA was the most useful method for identifying functional relations between the elements. After data reduction, four main factors controlling the variability were identified. Hierarchical cluster analysis (HCA) was applied for sample differentiation according to the sample location and working mode of the TPP. On the basis of this research, the new design of an optimal monitoring strategy for future analysis was proposed with a reduced number of measured parameters and with reduced frequency of their measurements.
T2  - Central European Journal of Chemistry
T1  - Spatial variations in the distribution of trace ionic impurities in the water-steam cycle in a thermal power plant based on a multivariate statistical approach
EP  - 1470
IS  - 9
SP  - 1456
VL  - 11
DO  - 10.2478/s11532-013-0286-4
ER  - 

@article{
author = "Živojinović, Dragana Z. and Rajaković-Ognjanović, Vladana and Onjia, Antonije and Rajaković, Ljubinka V.",
year = "2013",
abstract = "In this study, a multivariate statistical approach was used to identify the key variables responsible for process water quality in a power plant. The ion species that could cause corrosion in one of the major thermal power plants (TPP) in Serbia were monitored. A suppressed ion chromatographic (IC) method for the determination of the target anions and cations at trace levels was applied. In addition, some metals important for corrosion, i.e., copper and iron, were also analysed by the graphite furnace atomic absorption spectrophotometric (GFAAS) method. The control parameters, i.e., pH, dissolved oxygen and silica, were measured on-line. The analysis of a series of representative samples from the TPP Nikola Tesla, collected in different plant operation modes, was performed. Every day laboratory and on-line analysis provides a large number of data in relation to the quality of water in the water-steam cycle (WSC) which should be evaluated and processed. The goal of this investigation was to apply multivariate statistical techniques and choose the most applicable technique for this case. Factor analysis (FA), especially principal component analysis (PCA) and cluster analysis (CA) were investigated. These methods were applied for the evaluation of the spatial/temporal variations of process water and for the estimation of 13 quality parameters which were monitored at 11 locations in the WSC in different working conditions during a twelve month period. It was concluded that PCA was the most useful method for identifying functional relations between the elements. After data reduction, four main factors controlling the variability were identified. Hierarchical cluster analysis (HCA) was applied for sample differentiation according to the sample location and working mode of the TPP. On the basis of this research, the new design of an optimal monitoring strategy for future analysis was proposed with a reduced number of measured parameters and with reduced frequency of their measurements.",
journal = "Central European Journal of Chemistry",
title = "Spatial variations in the distribution of trace ionic impurities in the water-steam cycle in a thermal power plant based on a multivariate statistical approach",
pages = "1470-1456",
number = "9",
volume = "11",
doi = "10.2478/s11532-013-0286-4"
}

Živojinović, D. Z., Rajaković-Ognjanović, V., Onjia, A.,& Rajaković, L. V.. (2013). Spatial variations in the distribution of trace ionic impurities in the water-steam cycle in a thermal power plant based on a multivariate statistical approach. in Central European Journal of Chemistry, 11(9), 1456-1470.
https://doi.org/10.2478/s11532-013-0286-4

Živojinović DZ, Rajaković-Ognjanović V, Onjia A, Rajaković LV. Spatial variations in the distribution of trace ionic impurities in the water-steam cycle in a thermal power plant based on a multivariate statistical approach. in Central European Journal of Chemistry. 2013;11(9):1456-1470.
doi:10.2478/s11532-013-0286-4 .

Živojinović, Dragana Z., Rajaković-Ognjanović, Vladana, Onjia, Antonije, Rajaković, Ljubinka V., "Spatial variations in the distribution of trace ionic impurities in the water-steam cycle in a thermal power plant based on a multivariate statistical approach" in Central European Journal of Chemistry, 11, no. 9 (2013):1456-1470,
https://doi.org/10.2478/s11532-013-0286-4 . .

TY  - JOUR
AU  - Rajaković, Ljubinka V.
AU  - Todorović, Žaklina N.
AU  - Rajaković-Ognjanović, Vladana
AU  - Onjia, Antonije
PY  - 2013
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/503
AB  - Arsenic exists in the form of various chemical species differing in their physicochemical behaviour, toxicity, bioavailability and biotransformation. The determination of arsenic species is an important issue for environmental, clinical and food chemistry. However, differentiation of these species is a quite complex analytical task. Numerous speciation procedures have been studied that include electrochemical, chromatographic, spectrometric and hyphenated techniques. This review presents the relevant research in the field of arsenic speciation analysis with novel applications and significant advances. Stability of arsenic species and each of the analytical steps (sample collection, storage, preservation, extraction) of the arsenic speciation methods is particularly evaluated. Analytical validation and performance of these methods are also reviewed.
AB  - Arsen se nalazi u mnogobrojnim hemijskim vrstama koje se razlikuju po fizičko-hemijskom ponašanju, toksičnosti, biodostupnosti i biotransformaciji. Određivanje pojedinih arsenovih jedinjenja je neophodno u hemiji životne sredine, kliničkoj hemiji i hemiji hrane. Međutim, diferencijacija ovih vrsta je vrlo složen analitički zadatak. Za analizu arsenovih vrsta razvijen je veliki broj metoda i postupaka koje uključuju hromatografske, spektrometrijske i elektrohemijske tehnike i njihove kombinacije. U ovom preglednom radu obuhvaćena su relevantna istraživanja u oblasti specijacione analize arsena sa naglaskom na najznačajnija dostignuća i primenu. Održavanje nepromenljivog, originalnog sastava arsenovih specija u toku pojedinačnih analitičkih koraka (prikupljanje uzoraka, čuvanje, konzervisanje, ekstrakcija) posebno su razmatrani. Izdvojene su metode za direktno i indirektno određivanje arsenovih vrsta. Pobrojane su spregnute tehnike koje se najčešće primenjuju u praksi primenom metodologije koja podrazumeva preliminarnu separaciju jedinjenja, a zatim pojedinačno određivanje. Dat je pregled analitičkih svojstava, prednosti i nedostataka najprimerenijih analitičkih metoda, razvijenih upravo za analizu tragova arsenovih vrsta od neorganskih do organskih u različitim matricama. Izdvojene su i detaljnije prezentovane najznačajnije studije o arsenovim jedinjenjima u vodi.
PB  - Srpsko hemijsko društvo, Beograd
T2  - Journal of the Serbian Chemical Society
T1  - Analytical methods for arsenic speciation analysis
T1  - Analitičke metode za analizu arsenovih jedinjenja
EP  - 1479
IS  - 10
SP  - 1461
VL  - 78
DO  - 10.2298/JSC130315064R
ER  - 

@article{
author = "Rajaković, Ljubinka V. and Todorović, Žaklina N. and Rajaković-Ognjanović, Vladana and Onjia, Antonije",
year = "2013",
abstract = "Arsenic exists in the form of various chemical species differing in their physicochemical behaviour, toxicity, bioavailability and biotransformation. The determination of arsenic species is an important issue for environmental, clinical and food chemistry. However, differentiation of these species is a quite complex analytical task. Numerous speciation procedures have been studied that include electrochemical, chromatographic, spectrometric and hyphenated techniques. This review presents the relevant research in the field of arsenic speciation analysis with novel applications and significant advances. Stability of arsenic species and each of the analytical steps (sample collection, storage, preservation, extraction) of the arsenic speciation methods is particularly evaluated. Analytical validation and performance of these methods are also reviewed., Arsen se nalazi u mnogobrojnim hemijskim vrstama koje se razlikuju po fizičko-hemijskom ponašanju, toksičnosti, biodostupnosti i biotransformaciji. Određivanje pojedinih arsenovih jedinjenja je neophodno u hemiji životne sredine, kliničkoj hemiji i hemiji hrane. Međutim, diferencijacija ovih vrsta je vrlo složen analitički zadatak. Za analizu arsenovih vrsta razvijen je veliki broj metoda i postupaka koje uključuju hromatografske, spektrometrijske i elektrohemijske tehnike i njihove kombinacije. U ovom preglednom radu obuhvaćena su relevantna istraživanja u oblasti specijacione analize arsena sa naglaskom na najznačajnija dostignuća i primenu. Održavanje nepromenljivog, originalnog sastava arsenovih specija u toku pojedinačnih analitičkih koraka (prikupljanje uzoraka, čuvanje, konzervisanje, ekstrakcija) posebno su razmatrani. Izdvojene su metode za direktno i indirektno određivanje arsenovih vrsta. Pobrojane su spregnute tehnike koje se najčešće primenjuju u praksi primenom metodologije koja podrazumeva preliminarnu separaciju jedinjenja, a zatim pojedinačno određivanje. Dat je pregled analitičkih svojstava, prednosti i nedostataka najprimerenijih analitičkih metoda, razvijenih upravo za analizu tragova arsenovih vrsta od neorganskih do organskih u različitim matricama. Izdvojene su i detaljnije prezentovane najznačajnije studije o arsenovim jedinjenjima u vodi.",
publisher = "Srpsko hemijsko društvo, Beograd",
journal = "Journal of the Serbian Chemical Society",
title = "Analytical methods for arsenic speciation analysis, Analitičke metode za analizu arsenovih jedinjenja",
pages = "1479-1461",
number = "10",
volume = "78",
doi = "10.2298/JSC130315064R"
}

Rajaković, L. V., Todorović, Ž. N., Rajaković-Ognjanović, V.,& Onjia, A.. (2013). Analytical methods for arsenic speciation analysis. in Journal of the Serbian Chemical Society
Srpsko hemijsko društvo, Beograd., 78(10), 1461-1479.
https://doi.org/10.2298/JSC130315064R

Rajaković LV, Todorović ŽN, Rajaković-Ognjanović V, Onjia A. Analytical methods for arsenic speciation analysis. in Journal of the Serbian Chemical Society. 2013;78(10):1461-1479.
doi:10.2298/JSC130315064R .

Rajaković, Ljubinka V., Todorović, Žaklina N., Rajaković-Ognjanović, Vladana, Onjia, Antonije, "Analytical methods for arsenic speciation analysis" in Journal of the Serbian Chemical Society, 78, no. 10 (2013):1461-1479,
https://doi.org/10.2298/JSC130315064R . .

TY  - JOUR
AU  - Vukasinovic-Pesić, Vesna L.
AU  - Rajaković-Ognjanović, Vladana
AU  - Blagojević, Nada Z.
AU  - Grudić, Veselinka V.
AU  - Lekić, Branislava
AU  - Rajaković, Ljubinka V.
PY  - 2012
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/429
AB  - In this study, acid heat-activated neutralized red mud (AB) was promoted as an efficient sorbent for the removal of inorganic arsenic from water. Three sorbents: neutralized red mud (Bauxsol), acid-treated Bauxsol (aBauxsol), and AB were investigated for arsenic removal. The sorption of arsenic on these adsorbents was studied as a function of contact time, initial arsenic concentration, and adsorbent dosage. The Langmuir isotherm was the best-fit adsorption isotherm model for the experimental data. The adsorption capacity of the activated red mud for As(V) was found to be 1.49 mg g(-1) at a pH of water of 7.0. It was observed that AB at a dose of 6.0 gL(-1) could effectively remove As(III) and As(V) from water. Anion interference on a molar basis was found to follow the order: phosphate interference was higher than sulfate interference, which was higher than bicarbonate interference.
T2  - Chemical Engineering Communications
T1  - Enhanced Arsenic Removal from Water by Activated Red Mud Based on Hydrated Iron(III) and Titan(IV) Oxides
EP  - 864
IS  - 7
SP  - 849
VL  - 199
DO  - 10.1080/00986445.2011.631235
ER  - 

@article{
author = "Vukasinovic-Pesić, Vesna L. and Rajaković-Ognjanović, Vladana and Blagojević, Nada Z. and Grudić, Veselinka V. and Lekić, Branislava and Rajaković, Ljubinka V.",
year = "2012",
abstract = "In this study, acid heat-activated neutralized red mud (AB) was promoted as an efficient sorbent for the removal of inorganic arsenic from water. Three sorbents: neutralized red mud (Bauxsol), acid-treated Bauxsol (aBauxsol), and AB were investigated for arsenic removal. The sorption of arsenic on these adsorbents was studied as a function of contact time, initial arsenic concentration, and adsorbent dosage. The Langmuir isotherm was the best-fit adsorption isotherm model for the experimental data. The adsorption capacity of the activated red mud for As(V) was found to be 1.49 mg g(-1) at a pH of water of 7.0. It was observed that AB at a dose of 6.0 gL(-1) could effectively remove As(III) and As(V) from water. Anion interference on a molar basis was found to follow the order: phosphate interference was higher than sulfate interference, which was higher than bicarbonate interference.",
journal = "Chemical Engineering Communications",
title = "Enhanced Arsenic Removal from Water by Activated Red Mud Based on Hydrated Iron(III) and Titan(IV) Oxides",
pages = "864-849",
number = "7",
volume = "199",
doi = "10.1080/00986445.2011.631235"
}

Vukasinovic-Pesić, V. L., Rajaković-Ognjanović, V., Blagojević, N. Z., Grudić, V. V., Lekić, B.,& Rajaković, L. V.. (2012). Enhanced Arsenic Removal from Water by Activated Red Mud Based on Hydrated Iron(III) and Titan(IV) Oxides. in Chemical Engineering Communications, 199(7), 849-864.
https://doi.org/10.1080/00986445.2011.631235

Vukasinovic-Pesić VL, Rajaković-Ognjanović V, Blagojević NZ, Grudić VV, Lekić B, Rajaković LV. Enhanced Arsenic Removal from Water by Activated Red Mud Based on Hydrated Iron(III) and Titan(IV) Oxides. in Chemical Engineering Communications. 2012;199(7):849-864.
doi:10.1080/00986445.2011.631235 .

Vukasinovic-Pesić, Vesna L., Rajaković-Ognjanović, Vladana, Blagojević, Nada Z., Grudić, Veselinka V., Lekić, Branislava, Rajaković, Ljubinka V., "Enhanced Arsenic Removal from Water by Activated Red Mud Based on Hydrated Iron(III) and Titan(IV) Oxides" in Chemical Engineering Communications, 199, no. 7 (2012):849-864,
https://doi.org/10.1080/00986445.2011.631235 . .

TY  - JOUR
AU  - Rajaković, Ljubinka V.
AU  - Marković, Dana D.
AU  - Rajaković-Ognjanović, Vladana
AU  - Antanasijević, Davor Z.
PY  - 2012
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/466
AB  - The analytical properties of an analytical method must be evaluated through validation protocols. Beside specificity and/or selectivity, linearity of calibration, repeatability and accuracy, the most important parameters are: LOD (limit of detection) and LOQ (limit of quantification). Through these limits, it is possible to define the smallest concentration of analyte that can be reliably detected and quantified. To establish these limits, an analyst should apply several estimation methods and test a large number of sample replicates. It is difficult to make a compromise between complex statistical programs and the simple analytical demand to have reliable analytical parameters. The differences and equivalency of estimation methods and approaches for analytical limits could be overcome by an experimental comparison. In this paper, the focus is the LOD of inductively coupled plasma-mass spectrometry (ICP-MS) measurements employed for the determination of arsenic. The current approaches for the calculation of the LOD are summarized and critically discussed.
PB  - Elsevier B.V.
T2  - Talanta
T1  - Review: The approaches for estimation of limit of detection for ICP-MS trace analysis of arsenic
EP  - 87
SP  - 79
VL  - 102
DO  - 10.1016/j.talanta.2012.08.016
ER  - 

@article{
author = "Rajaković, Ljubinka V. and Marković, Dana D. and Rajaković-Ognjanović, Vladana and Antanasijević, Davor Z.",
year = "2012",
abstract = "The analytical properties of an analytical method must be evaluated through validation protocols. Beside specificity and/or selectivity, linearity of calibration, repeatability and accuracy, the most important parameters are: LOD (limit of detection) and LOQ (limit of quantification). Through these limits, it is possible to define the smallest concentration of analyte that can be reliably detected and quantified. To establish these limits, an analyst should apply several estimation methods and test a large number of sample replicates. It is difficult to make a compromise between complex statistical programs and the simple analytical demand to have reliable analytical parameters. The differences and equivalency of estimation methods and approaches for analytical limits could be overcome by an experimental comparison. In this paper, the focus is the LOD of inductively coupled plasma-mass spectrometry (ICP-MS) measurements employed for the determination of arsenic. The current approaches for the calculation of the LOD are summarized and critically discussed.",
publisher = "Elsevier B.V.",
journal = "Talanta",
title = "Review: The approaches for estimation of limit of detection for ICP-MS trace analysis of arsenic",
pages = "87-79",
volume = "102",
doi = "10.1016/j.talanta.2012.08.016"
}

Rajaković, L. V., Marković, D. D., Rajaković-Ognjanović, V.,& Antanasijević, D. Z.. (2012). Review: The approaches for estimation of limit of detection for ICP-MS trace analysis of arsenic. in Talanta
Elsevier B.V.., 102, 79-87.
https://doi.org/10.1016/j.talanta.2012.08.016

Rajaković LV, Marković DD, Rajaković-Ognjanović V, Antanasijević DZ. Review: The approaches for estimation of limit of detection for ICP-MS trace analysis of arsenic. in Talanta. 2012;102:79-87.
doi:10.1016/j.talanta.2012.08.016 .

Rajaković, Ljubinka V., Marković, Dana D., Rajaković-Ognjanović, Vladana, Antanasijević, Davor Z., "Review: The approaches for estimation of limit of detection for ICP-MS trace analysis of arsenic" in Talanta, 102 (2012):79-87,
https://doi.org/10.1016/j.talanta.2012.08.016 . .

TY  - JOUR
AU  - Ben Issa, Nureddin
AU  - Rajaković-Ognjanović, Vladana
AU  - Marinković, Aleksandar
AU  - Rajaković, Ljubinka V.
PY  - 2011
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/354
AB  - A simple and efficient method for separation and determination of inorganic arsenic (iAs) and organic arsenic (oAs) in drinking, natural and wastewater was developed. If arsenic is present in water prevailing forms are inorganic acids of As(III) and As(V). oAs can be found in traces as monomethylarsenic acid, MMA(V), and dimethylarsenic acid, DMAs(V). Three types of resins: a strong base anion exchange (SBAE) and two hybrid (HY) resins: HY-Fe and HY-AgCl, based on the activity of hydrated iron oxides and a silver chloride were investigated. It was found that the sorption processes (ion exchange, adsorption and chemisorptions) of arsenic species on SBAE (ion exchange) and HY resins depend on pH values of water. The quantitative separation of molecular and ionic forms of iAs and oAs was achieved by SBAE and pH adjustment, the molecular form of As(III) that exists in the water at pH lt 8.0 was not bonded with SBAE, which was convenient for direct determination of As(III) concentration in the effluent. HY-Fe resin retained all arsenic species except DMAs(V), which makes possible direct measurements of this specie in the effluent. HY-AgCl resin retained all iAs which was convenient for direct determination of oAs species concentration in the effluent. The selective bonding of arsenic species on three types of resins makes possible the development of the procedure for measuring and calculation of all arsenic species in water. In order to determine capacity of resins the preliminary investigations were performed in batch system and fixed bed flow system. Resin capacities were calculated according to breakthrough points in a fixed bed flow system which is the first step in designing of solid phase extraction (SPE) module for arsenic speciation separation and determination. Arsenic adsorption behavior in the presence of impurities showed tolerance with the respect to potential interference of anionic compounds commonly found in natural water. Proposed method was established performing standard procedures: with external standard, certified reference material and standard addition method. Two analytical techniques: the inductively coupled plasma mass spectrometry (ICP-MS) and atomic absorption spectroscopy-hydride generation (AAS-GH) were comparatively applied for the determination of arsenic in all arsenic species in water. ICP-MS detection limit was 0.2 mu g L(-1) and relative standard deviation (RSD) of all arsenic species investigated was between 3.5 and 5.1%.
T2  - Analytica Chimica Acta
T1  - Separation and determination of arsenic species in water by selective exchange and hybrid resins
EP  - 198
IS  - 1
SP  - 191
VL  - 706
DO  - 10.1016/j.aca.2011.08.015
ER  - 

@article{
author = "Ben Issa, Nureddin and Rajaković-Ognjanović, Vladana and Marinković, Aleksandar and Rajaković, Ljubinka V.",
year = "2011",
abstract = "A simple and efficient method for separation and determination of inorganic arsenic (iAs) and organic arsenic (oAs) in drinking, natural and wastewater was developed. If arsenic is present in water prevailing forms are inorganic acids of As(III) and As(V). oAs can be found in traces as monomethylarsenic acid, MMA(V), and dimethylarsenic acid, DMAs(V). Three types of resins: a strong base anion exchange (SBAE) and two hybrid (HY) resins: HY-Fe and HY-AgCl, based on the activity of hydrated iron oxides and a silver chloride were investigated. It was found that the sorption processes (ion exchange, adsorption and chemisorptions) of arsenic species on SBAE (ion exchange) and HY resins depend on pH values of water. The quantitative separation of molecular and ionic forms of iAs and oAs was achieved by SBAE and pH adjustment, the molecular form of As(III) that exists in the water at pH lt 8.0 was not bonded with SBAE, which was convenient for direct determination of As(III) concentration in the effluent. HY-Fe resin retained all arsenic species except DMAs(V), which makes possible direct measurements of this specie in the effluent. HY-AgCl resin retained all iAs which was convenient for direct determination of oAs species concentration in the effluent. The selective bonding of arsenic species on three types of resins makes possible the development of the procedure for measuring and calculation of all arsenic species in water. In order to determine capacity of resins the preliminary investigations were performed in batch system and fixed bed flow system. Resin capacities were calculated according to breakthrough points in a fixed bed flow system which is the first step in designing of solid phase extraction (SPE) module for arsenic speciation separation and determination. Arsenic adsorption behavior in the presence of impurities showed tolerance with the respect to potential interference of anionic compounds commonly found in natural water. Proposed method was established performing standard procedures: with external standard, certified reference material and standard addition method. Two analytical techniques: the inductively coupled plasma mass spectrometry (ICP-MS) and atomic absorption spectroscopy-hydride generation (AAS-GH) were comparatively applied for the determination of arsenic in all arsenic species in water. ICP-MS detection limit was 0.2 mu g L(-1) and relative standard deviation (RSD) of all arsenic species investigated was between 3.5 and 5.1%.",
journal = "Analytica Chimica Acta",
title = "Separation and determination of arsenic species in water by selective exchange and hybrid resins",
pages = "198-191",
number = "1",
volume = "706",
doi = "10.1016/j.aca.2011.08.015"
}

Ben Issa, N., Rajaković-Ognjanović, V., Marinković, A.,& Rajaković, L. V.. (2011). Separation and determination of arsenic species in water by selective exchange and hybrid resins. in Analytica Chimica Acta, 706(1), 191-198.
https://doi.org/10.1016/j.aca.2011.08.015

Ben Issa N, Rajaković-Ognjanović V, Marinković A, Rajaković LV. Separation and determination of arsenic species in water by selective exchange and hybrid resins. in Analytica Chimica Acta. 2011;706(1):191-198.
doi:10.1016/j.aca.2011.08.015 .

Ben Issa, Nureddin, Rajaković-Ognjanović, Vladana, Marinković, Aleksandar, Rajaković, Ljubinka V., "Separation and determination of arsenic species in water by selective exchange and hybrid resins" in Analytica Chimica Acta, 706, no. 1 (2011):191-198,
https://doi.org/10.1016/j.aca.2011.08.015 . .

TY  - JOUR
AU  - Rajaković-Ognjanović, Vladana
AU  - Živojinović, Dragana Z.
AU  - Grgur, Branimir N.
AU  - Rajaković, Ljubinka V.
PY  - 2011
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/410
AB  - A more effective chemical control in the water-steam cycle (WSC) of thermal power plants (TPP) is proposed in this paper. Minimization of corrosion effects by the production of ultra pure water and its strict control is the basis of all the investigated processes. The research involved the analysis of water samples in the WSC through key water quality parameters and by the most convenient analytical tools. The necessity for the stricter chemical control is demonstrated through a concrete example of the TPP Nikola Tesla, Serbia. After a thorough analysis of the chemical control system of the WSC, diagnostic and control parameters were chosen for continuous systematic measurements. Sodium and chloride ions were recognized as the ions which indicate the corrosion potential of the water and give insight into the proper production and maintenance of water within the WSC. Chemical transformations of crucial corrosion elements, iron and silica, were considered and related to their quantitative values.
T2  - Applied Thermal Engineering
T1  - Improvement of chemical control in the water-steam cycle of thermal power plants
EP  - 128
IS  - 1
SP  - 119
VL  - 31
DO  - 10.1016/j.applthermaleng.2010.08.028
ER  - 

@article{
author = "Rajaković-Ognjanović, Vladana and Živojinović, Dragana Z. and Grgur, Branimir N. and Rajaković, Ljubinka V.",
year = "2011",
abstract = "A more effective chemical control in the water-steam cycle (WSC) of thermal power plants (TPP) is proposed in this paper. Minimization of corrosion effects by the production of ultra pure water and its strict control is the basis of all the investigated processes. The research involved the analysis of water samples in the WSC through key water quality parameters and by the most convenient analytical tools. The necessity for the stricter chemical control is demonstrated through a concrete example of the TPP Nikola Tesla, Serbia. After a thorough analysis of the chemical control system of the WSC, diagnostic and control parameters were chosen for continuous systematic measurements. Sodium and chloride ions were recognized as the ions which indicate the corrosion potential of the water and give insight into the proper production and maintenance of water within the WSC. Chemical transformations of crucial corrosion elements, iron and silica, were considered and related to their quantitative values.",
journal = "Applied Thermal Engineering",
title = "Improvement of chemical control in the water-steam cycle of thermal power plants",
pages = "128-119",
number = "1",
volume = "31",
doi = "10.1016/j.applthermaleng.2010.08.028"
}

Rajaković-Ognjanović, V., Živojinović, D. Z., Grgur, B. N.,& Rajaković, L. V.. (2011). Improvement of chemical control in the water-steam cycle of thermal power plants. in Applied Thermal Engineering, 31(1), 119-128.
https://doi.org/10.1016/j.applthermaleng.2010.08.028

Rajaković-Ognjanović V, Živojinović DZ, Grgur BN, Rajaković LV. Improvement of chemical control in the water-steam cycle of thermal power plants. in Applied Thermal Engineering. 2011;31(1):119-128.
doi:10.1016/j.applthermaleng.2010.08.028 .

Rajaković-Ognjanović, Vladana, Živojinović, Dragana Z., Grgur, Branimir N., Rajaković, Ljubinka V., "Improvement of chemical control in the water-steam cycle of thermal power plants" in Applied Thermal Engineering, 31, no. 1 (2011):119-128,
https://doi.org/10.1016/j.applthermaleng.2010.08.028 . .

TY  - JOUR
AU  - Zarković, Darja B.
AU  - Rajaković-Ognjanović, Vladana
AU  - Rajaković, Ljubinka V.
PY  - 2011
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/346
AB  - This paper analyses the utilization of water and recycled fiber from waste paper for the production in one Serbian cardboard mill. Water and fiber consumption, wastewater generation and its characteristics, as well as sludge recirculation were monitored during production of various paper types, with different grade and weight. The aim was to evaluate production rationality and running stability concerning water and fiber utilization and possibilities for their conservation. Cleaner production measures inside the mill and in the effluent treatment plant were suggested for the improvement of wastewater quality and water conservation. Savings in water and fibers were estimated, with the respect to economic and environmental aspects of proposed cleaner production measures.
T2  - Resources Conservation and Recycling
T1  - Conservation of resources in the pulp and paper industry derived from cleaner production approach
EP  - 1145
IS  - 12
SP  - 1139
VL  - 55
DO  - 10.1016/j.resconrec.2011.07.003
ER  - 

@article{
author = "Zarković, Darja B. and Rajaković-Ognjanović, Vladana and Rajaković, Ljubinka V.",
year = "2011",
abstract = "This paper analyses the utilization of water and recycled fiber from waste paper for the production in one Serbian cardboard mill. Water and fiber consumption, wastewater generation and its characteristics, as well as sludge recirculation were monitored during production of various paper types, with different grade and weight. The aim was to evaluate production rationality and running stability concerning water and fiber utilization and possibilities for their conservation. Cleaner production measures inside the mill and in the effluent treatment plant were suggested for the improvement of wastewater quality and water conservation. Savings in water and fibers were estimated, with the respect to economic and environmental aspects of proposed cleaner production measures.",
journal = "Resources Conservation and Recycling",
title = "Conservation of resources in the pulp and paper industry derived from cleaner production approach",
pages = "1145-1139",
number = "12",
volume = "55",
doi = "10.1016/j.resconrec.2011.07.003"
}

Zarković, D. B., Rajaković-Ognjanović, V.,& Rajaković, L. V.. (2011). Conservation of resources in the pulp and paper industry derived from cleaner production approach. in Resources Conservation and Recycling, 55(12), 1139-1145.
https://doi.org/10.1016/j.resconrec.2011.07.003

Zarković DB, Rajaković-Ognjanović V, Rajaković LV. Conservation of resources in the pulp and paper industry derived from cleaner production approach. in Resources Conservation and Recycling. 2011;55(12):1139-1145.
doi:10.1016/j.resconrec.2011.07.003 .

Zarković, Darja B., Rajaković-Ognjanović, Vladana, Rajaković, Ljubinka V., "Conservation of resources in the pulp and paper industry derived from cleaner production approach" in Resources Conservation and Recycling, 55, no. 12 (2011):1139-1145,
https://doi.org/10.1016/j.resconrec.2011.07.003 . .

TY  - JOUR
AU  - Lekić, Branislava
AU  - Vukasinovic-Pesić, Vesna L.
AU  - Rajaković, Ljubinka V.
PY  - 2011
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/399
AB  - Mechanism and performances of arsenic(III) [As(III)] and arsenic(V) [As(V)] sorption onto hydrated iron(III) oxide (HFO)-coated materials were investigated at neutral pH where arsenic occurs in both molecular and ionic forms. Arsenic sorption by HFO-coated materials was proven to be a multistage process consisting of both macropore and intraparticle diffusion. Higher mass-transfer velocities were obtained for As(III), which is attributed to the beneficial features of HFO. Equilibrium studies revealed the spontaneous and favorable nature of the arsenic sorption process. The maximum sorption capacity and the Gibbs free energy values indicated that HFO-coated materials exhibit more affinity towards As(III). The Langmuir and Freundlich isotherm models revealed both the chemical and physical nature of the sorption process, while the Dubinin-Radushkevich model indicated that physical sorption is a more dominant process with HFO-coated materials. Water Environ. Res., 83, 498 (2011).
PB  - Water Environment Federation
T2  - Water Environment Research
T1  - Enhanced Arsenic Sorption by Hydrated Iron (III) Oxide-Coated Materials-Mechanism and Performances
EP  - 506
IS  - 6
SP  - 498
VL  - 83
DO  - 10.2175/106143010X12851009156484
ER  - 

@article{
author = "Lekić, Branislava and Vukasinovic-Pesić, Vesna L. and Rajaković, Ljubinka V.",
year = "2011",
abstract = "Mechanism and performances of arsenic(III) [As(III)] and arsenic(V) [As(V)] sorption onto hydrated iron(III) oxide (HFO)-coated materials were investigated at neutral pH where arsenic occurs in both molecular and ionic forms. Arsenic sorption by HFO-coated materials was proven to be a multistage process consisting of both macropore and intraparticle diffusion. Higher mass-transfer velocities were obtained for As(III), which is attributed to the beneficial features of HFO. Equilibrium studies revealed the spontaneous and favorable nature of the arsenic sorption process. The maximum sorption capacity and the Gibbs free energy values indicated that HFO-coated materials exhibit more affinity towards As(III). The Langmuir and Freundlich isotherm models revealed both the chemical and physical nature of the sorption process, while the Dubinin-Radushkevich model indicated that physical sorption is a more dominant process with HFO-coated materials. Water Environ. Res., 83, 498 (2011).",
publisher = "Water Environment Federation",
journal = "Water Environment Research",
title = "Enhanced Arsenic Sorption by Hydrated Iron (III) Oxide-Coated Materials-Mechanism and Performances",
pages = "506-498",
number = "6",
volume = "83",
doi = "10.2175/106143010X12851009156484"
}

Lekić, B., Vukasinovic-Pesić, V. L.,& Rajaković, L. V.. (2011). Enhanced Arsenic Sorption by Hydrated Iron (III) Oxide-Coated Materials-Mechanism and Performances. in Water Environment Research
Water Environment Federation., 83(6), 498-506.
https://doi.org/10.2175/106143010X12851009156484

Lekić B, Vukasinovic-Pesić VL, Rajaković LV. Enhanced Arsenic Sorption by Hydrated Iron (III) Oxide-Coated Materials-Mechanism and Performances. in Water Environment Research. 2011;83(6):498-506.
doi:10.2175/106143010X12851009156484 .

Lekić, Branislava, Vukasinovic-Pesić, Vesna L., Rajaković, Ljubinka V., "Enhanced Arsenic Sorption by Hydrated Iron (III) Oxide-Coated Materials-Mechanism and Performances" in Water Environment Research, 83, no. 6 (2011):498-506,
https://doi.org/10.2175/106143010X12851009156484 . .

TY  - JOUR
AU  - Lekić, Branislava
AU  - Ljubisavljević, Dejan
AU  - Rajaković, Ljubinka V.
PY  - 2011
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/392
AB  - This paper deals with arsenic removal from water by adsorption with unconventional materials: natural materials (zeolite, bentonite, sepiolite, limonite, pyrolusite), waste materials (waste iron slag, waste sand filter) and modified materials (neutralized waste iron slag, iron(III)-hydroxide coated sand and activated carbon). Under the same conditions are investigated commercial sorbents to compare results. Arsenic removal by adsorption with unconventional materials is investigated in the batch reactor. The best results in batch reactor are obtained with waste materials. Waste iron slag and waste filter sand exhibited equilibrium sorption capacities of 50 μg/g and 30 μg/g, respectively, which is nearly equal to values obtained for the commercial sorbents. Due to the high content of CaO waste iron slag increases significantly water pH (pH=11). In order to minimize its deteriorating impact on the initial water quality, the waste iron slag was neutralized. The new, modified waste iron slag exhibited the highest sorption capacity, 55.
AB  - U ovom radu su prikazani rezultati istraživanja efikasnosti uklanjanja arsena iz vode sorpcijom na nekonvencionalnim materijalima: prirodnim (zeolit, bentonit, sepiolit, limonit, piroluzit), otpadnim (otpadna šljaka, otpadni filtarski pesak) i modifikovanim (modifikovana otpadna šljaka, kvarcni pesak i aktivni ugalj impregnisani gvožđe(III)-hidroksidom). Pod istim uslovima paralelno su ispitivani komercijalni sorbenti radi poređenja rezultata. Uklanjanje arsena iz vode sorpcijom je ispitivana u šaržnom sistemu Najbolji rezultati u šaržnom sistemu dobijeni su sa otpadnim materijalima: za otpadnu šljaku i 30 μg/g za otpadni filtarski pesak (za Co=0,5 mg/L), što je u nivou vrednosti koje su dobijene za komercijalne sorbente za uklanjanje arsena. Zbog visokog sadržaja CaO, otpadna šljaka značajno povećava pH vrednost vode (pH= 11). Neutralizacijom otpadne šljake dobijen je nov materijal, modifikovana otpadna šljaka, većeg sorpcionog kapaciteta: 55.
PB  - Jugoslovensko društvo za odvodnjavanje i navodnjavanje, Beograd
T2  - Vodoprivreda
T1  - Low cost arsenic removal from aqueous solution by adsorption
T1  - Uklanjanje arsena iz vode adsorpcijom na nekonvencionalnim materijalima
EP  - 150
IS  - 4-6
SP  - 127
VL  - 43
UR  - https://hdl.handle.net/21.15107/rcub_grafar_392
ER  - 

@article{
author = "Lekić, Branislava and Ljubisavljević, Dejan and Rajaković, Ljubinka V.",
year = "2011",
abstract = "This paper deals with arsenic removal from water by adsorption with unconventional materials: natural materials (zeolite, bentonite, sepiolite, limonite, pyrolusite), waste materials (waste iron slag, waste sand filter) and modified materials (neutralized waste iron slag, iron(III)-hydroxide coated sand and activated carbon). Under the same conditions are investigated commercial sorbents to compare results. Arsenic removal by adsorption with unconventional materials is investigated in the batch reactor. The best results in batch reactor are obtained with waste materials. Waste iron slag and waste filter sand exhibited equilibrium sorption capacities of 50 μg/g and 30 μg/g, respectively, which is nearly equal to values obtained for the commercial sorbents. Due to the high content of CaO waste iron slag increases significantly water pH (pH=11). In order to minimize its deteriorating impact on the initial water quality, the waste iron slag was neutralized. The new, modified waste iron slag exhibited the highest sorption capacity, 55., U ovom radu su prikazani rezultati istraživanja efikasnosti uklanjanja arsena iz vode sorpcijom na nekonvencionalnim materijalima: prirodnim (zeolit, bentonit, sepiolit, limonit, piroluzit), otpadnim (otpadna šljaka, otpadni filtarski pesak) i modifikovanim (modifikovana otpadna šljaka, kvarcni pesak i aktivni ugalj impregnisani gvožđe(III)-hidroksidom). Pod istim uslovima paralelno su ispitivani komercijalni sorbenti radi poređenja rezultata. Uklanjanje arsena iz vode sorpcijom je ispitivana u šaržnom sistemu Najbolji rezultati u šaržnom sistemu dobijeni su sa otpadnim materijalima: za otpadnu šljaku i 30 μg/g za otpadni filtarski pesak (za Co=0,5 mg/L), što je u nivou vrednosti koje su dobijene za komercijalne sorbente za uklanjanje arsena. Zbog visokog sadržaja CaO, otpadna šljaka značajno povećava pH vrednost vode (pH= 11). Neutralizacijom otpadne šljake dobijen je nov materijal, modifikovana otpadna šljaka, većeg sorpcionog kapaciteta: 55.",
publisher = "Jugoslovensko društvo za odvodnjavanje i navodnjavanje, Beograd",
journal = "Vodoprivreda",
title = "Low cost arsenic removal from aqueous solution by adsorption, Uklanjanje arsena iz vode adsorpcijom na nekonvencionalnim materijalima",
pages = "150-127",
number = "4-6",
volume = "43",
url = "https://hdl.handle.net/21.15107/rcub_grafar_392"
}

Lekić, B., Ljubisavljević, D.,& Rajaković, L. V.. (2011). Low cost arsenic removal from aqueous solution by adsorption. in Vodoprivreda
Jugoslovensko društvo za odvodnjavanje i navodnjavanje, Beograd., 43(4-6), 127-150.
https://hdl.handle.net/21.15107/rcub_grafar_392

Lekić B, Ljubisavljević D, Rajaković LV. Low cost arsenic removal from aqueous solution by adsorption. in Vodoprivreda. 2011;43(4-6):127-150.
https://hdl.handle.net/21.15107/rcub_grafar_392 .

Lekić, Branislava, Ljubisavljević, Dejan, Rajaković, Ljubinka V., "Low cost arsenic removal from aqueous solution by adsorption" in Vodoprivreda, 43, no. 4-6 (2011):127-150,
https://hdl.handle.net/21.15107/rcub_grafar_392 .

TY  - JOUR
AU  - Ben Issa, Nureddin
AU  - Rajaković-Ognjanović, Vladana
AU  - Jovanović, Branislava M.
AU  - Rajaković, Ljubinka V.
PY  - 2010
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/291
AB  - A simple method for the separation and determination of inorganic arsenic (iAs) species in natural and drinking water was developed. Procedures for sample preparation, separation of As(III) and As(V) species and preconcentration of the total iAs on fixed bed columns were defined. Two resins, a strong base anion exchange (SBAE) resin and a hybrid (HY) resin were utilized. The inductively-coupled plasma-mass spectrometry method was applied as the analytical method for the determination of the arsenic concentration in water. The governing factors for the ion exchange/sorption of arsenic on resins in a batch and a fixed bed flow system were analyzed and compared. Acidity of the water, which plays an important role in the control of the ionic or molecular forms of arsenic species, was beneficial for the separation; by adjusting the pH values to less than 8.00, the SBAE resin separated As(V) from As(III) in water by retaining As(V) and allowing As(III) to pass through. The sorption activity of the hydrated iron oxide particles integrated into the HY resin was beneficial for bonding of all iAs species over a wide range of pH values from 5.00 to 11.00. The resin capacities were calculated according to the breakthrough points in a fixed bed flow system. At pH 7.50, the SBAE resin bound more than 370 mu g g(-1) of As(V) while the HY resin bound more than 4150 mu g g(-1) of As(III) and more than 3500 mu g g(-1) of As(V). The high capacities and selectivity of the resins were considered as advantageous for the development and application of two procedures, one for the separation and determination of As(III) (with SBAE) and the other for the preconcentration and determination of the total arsenic (with HY resin). Methods were established through basic analytical procedures (with external standards, certified reference materials and the standard addition method) and by the parallel analysis of some samples using the atomic absorption spectrometry-hydride generation technique. The analytical properties of both procedures were similar: the limit of detection was 0.24 mu g L-1, the limit of quantification was 0.80 mu g L-1 and the relative standard deviations for samples with a content of arsenic from 10.00 to 300.0 mu g L-1 ranged from 1.1 to 5.8%. The interference effects of anions commonly found in water and some organic species which can be present in water were found to be negligible. Verification with certified reference materials proved that the experimental concentrations found for model solutions and real samples were in agreement with the certified values.
T2  - Analytica Chimica Acta
T1  - Determination of inorganic arsenic species in natural waters-Benefits of separation and preconcentration on ion exchange and hybrid resins
EP  - 193
IS  - 2
SP  - 185
VL  - 673
DO  - 10.1016/j.aca.2010.05.027
ER  - 

@article{
author = "Ben Issa, Nureddin and Rajaković-Ognjanović, Vladana and Jovanović, Branislava M. and Rajaković, Ljubinka V.",
year = "2010",
abstract = "A simple method for the separation and determination of inorganic arsenic (iAs) species in natural and drinking water was developed. Procedures for sample preparation, separation of As(III) and As(V) species and preconcentration of the total iAs on fixed bed columns were defined. Two resins, a strong base anion exchange (SBAE) resin and a hybrid (HY) resin were utilized. The inductively-coupled plasma-mass spectrometry method was applied as the analytical method for the determination of the arsenic concentration in water. The governing factors for the ion exchange/sorption of arsenic on resins in a batch and a fixed bed flow system were analyzed and compared. Acidity of the water, which plays an important role in the control of the ionic or molecular forms of arsenic species, was beneficial for the separation; by adjusting the pH values to less than 8.00, the SBAE resin separated As(V) from As(III) in water by retaining As(V) and allowing As(III) to pass through. The sorption activity of the hydrated iron oxide particles integrated into the HY resin was beneficial for bonding of all iAs species over a wide range of pH values from 5.00 to 11.00. The resin capacities were calculated according to the breakthrough points in a fixed bed flow system. At pH 7.50, the SBAE resin bound more than 370 mu g g(-1) of As(V) while the HY resin bound more than 4150 mu g g(-1) of As(III) and more than 3500 mu g g(-1) of As(V). The high capacities and selectivity of the resins were considered as advantageous for the development and application of two procedures, one for the separation and determination of As(III) (with SBAE) and the other for the preconcentration and determination of the total arsenic (with HY resin). Methods were established through basic analytical procedures (with external standards, certified reference materials and the standard addition method) and by the parallel analysis of some samples using the atomic absorption spectrometry-hydride generation technique. The analytical properties of both procedures were similar: the limit of detection was 0.24 mu g L-1, the limit of quantification was 0.80 mu g L-1 and the relative standard deviations for samples with a content of arsenic from 10.00 to 300.0 mu g L-1 ranged from 1.1 to 5.8%. The interference effects of anions commonly found in water and some organic species which can be present in water were found to be negligible. Verification with certified reference materials proved that the experimental concentrations found for model solutions and real samples were in agreement with the certified values.",
journal = "Analytica Chimica Acta",
title = "Determination of inorganic arsenic species in natural waters-Benefits of separation and preconcentration on ion exchange and hybrid resins",
pages = "193-185",
number = "2",
volume = "673",
doi = "10.1016/j.aca.2010.05.027"
}

Ben Issa, N., Rajaković-Ognjanović, V., Jovanović, B. M.,& Rajaković, L. V.. (2010). Determination of inorganic arsenic species in natural waters-Benefits of separation and preconcentration on ion exchange and hybrid resins. in Analytica Chimica Acta, 673(2), 185-193.
https://doi.org/10.1016/j.aca.2010.05.027

Ben Issa N, Rajaković-Ognjanović V, Jovanović BM, Rajaković LV. Determination of inorganic arsenic species in natural waters-Benefits of separation and preconcentration on ion exchange and hybrid resins. in Analytica Chimica Acta. 2010;673(2):185-193.
doi:10.1016/j.aca.2010.05.027 .

Ben Issa, Nureddin, Rajaković-Ognjanović, Vladana, Jovanović, Branislava M., Rajaković, Ljubinka V., "Determination of inorganic arsenic species in natural waters-Benefits of separation and preconcentration on ion exchange and hybrid resins" in Analytica Chimica Acta, 673, no. 2 (2010):185-193,
https://doi.org/10.1016/j.aca.2010.05.027 . .

TY  - JOUR
AU  - Jovanović, Branislava M.
AU  - Rajaković, Ljubinka V.
PY  - 2010
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/302
AB  - The sorption of inorganic arsenic species (arsenite and arsenate) from aqueous solutions onto steel-mill waste and waste filter sand, under neutral conditions, was investigated in this study. Additionally, the steel-mill waste material was modified in order to minimize its deteriorating impact on the initial water quality and to meet the drinking water standards. The influence of contact time and initial arsenic concentration was investigated using batch system techniques. To evaluate the application for real groundwater treatment, the capacities of the obtained waste materials were further compared to those exhibited by commercial sorbents, which were examined under the same experimental conditions. Kinetic studies revealed that waste slag materials are the most efficient in arsenic removal, reaching equilibrium arsenic sorption capacities in the range 47.6-55.2 mu g/g, while waste filter sand exhibited capacities of 25.4-29.8 mu g/g (for an initial arsenic concentration C-o=0.5 mg/L). The higher iron content in the slag materials was considered to be responsible for the better removal efficiencies, and the specific arsenic removal efficiency was estimated to be 220 mu gAs/gFe. The specific arsenic removal efficiency of the second active substance found in waste filter sand, manganese, was estimated to be 115 mu gAs/gMn. Equilibrium studies revealed the occurrence of both chemisorption and physical sorption processes. All the waste materials exhibited higher performances for As (V). The highest maximum sorption capacity was obtained by waste iron slag: 4040 mu g/g for As (V). The waste materials reached the arsenic removal capacities of the examined commercial materials, suggesting the feasibility of their application in real groundwater treatment.
T2  - Journal of Environmental Engineering
T1  - New Approach: Waste Materials as Sorbents for Arsenic Removal from Water
EP  - 1286
IS  - 11
SP  - 1277
VL  - 136
DO  - 10.1061/(ASCE)EE.1943-7870.0000266
ER  - 

@article{
author = "Jovanović, Branislava M. and Rajaković, Ljubinka V.",
year = "2010",
abstract = "The sorption of inorganic arsenic species (arsenite and arsenate) from aqueous solutions onto steel-mill waste and waste filter sand, under neutral conditions, was investigated in this study. Additionally, the steel-mill waste material was modified in order to minimize its deteriorating impact on the initial water quality and to meet the drinking water standards. The influence of contact time and initial arsenic concentration was investigated using batch system techniques. To evaluate the application for real groundwater treatment, the capacities of the obtained waste materials were further compared to those exhibited by commercial sorbents, which were examined under the same experimental conditions. Kinetic studies revealed that waste slag materials are the most efficient in arsenic removal, reaching equilibrium arsenic sorption capacities in the range 47.6-55.2 mu g/g, while waste filter sand exhibited capacities of 25.4-29.8 mu g/g (for an initial arsenic concentration C-o=0.5 mg/L). The higher iron content in the slag materials was considered to be responsible for the better removal efficiencies, and the specific arsenic removal efficiency was estimated to be 220 mu gAs/gFe. The specific arsenic removal efficiency of the second active substance found in waste filter sand, manganese, was estimated to be 115 mu gAs/gMn. Equilibrium studies revealed the occurrence of both chemisorption and physical sorption processes. All the waste materials exhibited higher performances for As (V). The highest maximum sorption capacity was obtained by waste iron slag: 4040 mu g/g for As (V). The waste materials reached the arsenic removal capacities of the examined commercial materials, suggesting the feasibility of their application in real groundwater treatment.",
journal = "Journal of Environmental Engineering",
title = "New Approach: Waste Materials as Sorbents for Arsenic Removal from Water",
pages = "1286-1277",
number = "11",
volume = "136",
doi = "10.1061/(ASCE)EE.1943-7870.0000266"
}

Jovanović, B. M.,& Rajaković, L. V.. (2010). New Approach: Waste Materials as Sorbents for Arsenic Removal from Water. in Journal of Environmental Engineering, 136(11), 1277-1286.
https://doi.org/10.1061/(ASCE)EE.1943-7870.0000266

Jovanović BM, Rajaković LV. New Approach: Waste Materials as Sorbents for Arsenic Removal from Water. in Journal of Environmental Engineering. 2010;136(11):1277-1286.
doi:10.1061/(ASCE)EE.1943-7870.0000266 .

Jovanović, Branislava M., Rajaković, Ljubinka V., "New Approach: Waste Materials as Sorbents for Arsenic Removal from Water" in Journal of Environmental Engineering, 136, no. 11 (2010):1277-1286,
https://doi.org/10.1061/(ASCE)EE.1943-7870.0000266 . .

TY  - JOUR
AU  - Rajaković-Ognjanović, Vladana
AU  - Aleksić, G.
AU  - Rajaković, Ljubinka V.
PY  - 2008
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/205
AB  - This paper has been focused on the sorbent efficiency for motor oil removal from water. Two types of sorbents were investigated: organic and inorganic. Natural wool fibers (NWFs) and recycled-wool-based nonwoven material (RWNM)) were tested as organic type of sorbents. Sepiolite, bentonite and zeolite have been chosen as representative inorganic sorbents. Sorption was carried out in batch sorption system. Efficiency of oil removal was determined by measuring the oil concentration before and after the sorption process. Extractive-gravimetric method and refractive index determination have been applied as analytical methods for determination of oil concentration in water. Governing factors for sorbent efficiency were proposed, analysed and compared. It was concluded that sorption process is mostly affected by mass of sorbent, sorption time, temperature and pH value of water. NWFs, which were the most efficient sorbent showed maximal efficiency and maximal sorption capacity: 0.1 g of NWFs after 10 min at 20 degrees C and pH 8.00 sorbed 3.3 g of motor oil from 300 mL of water polluted with 4.5 g of motor oil. Maximal efficiency for all sorbents investigated was reached after 30 min of sorption processes, it was 95.0% for NWF, 43.0% for NRWM, 20.7% for sepiolite, 19.6% for bentonite and 21.2% for zeolite. Physical adsorption onto all sorbents is a favorable process (sorption efficiency decrease with increasing temperature) while sorption onto bentonite and zeolite is a result of both physical adsorption and chemisorption (sorption efficiency increase with increasing temperature, up to 80 degrees C).
T2  - Journal of Hazardous Materials
T1  - Governing factors for motor oil removal from water with different sorption materials
EP  - 563
IS  - 1-3
SP  - 558
VL  - 154
DO  - 10.1016/j.jhazmat.2007.10.066
ER  - 

@article{
author = "Rajaković-Ognjanović, Vladana and Aleksić, G. and Rajaković, Ljubinka V.",
year = "2008",
abstract = "This paper has been focused on the sorbent efficiency for motor oil removal from water. Two types of sorbents were investigated: organic and inorganic. Natural wool fibers (NWFs) and recycled-wool-based nonwoven material (RWNM)) were tested as organic type of sorbents. Sepiolite, bentonite and zeolite have been chosen as representative inorganic sorbents. Sorption was carried out in batch sorption system. Efficiency of oil removal was determined by measuring the oil concentration before and after the sorption process. Extractive-gravimetric method and refractive index determination have been applied as analytical methods for determination of oil concentration in water. Governing factors for sorbent efficiency were proposed, analysed and compared. It was concluded that sorption process is mostly affected by mass of sorbent, sorption time, temperature and pH value of water. NWFs, which were the most efficient sorbent showed maximal efficiency and maximal sorption capacity: 0.1 g of NWFs after 10 min at 20 degrees C and pH 8.00 sorbed 3.3 g of motor oil from 300 mL of water polluted with 4.5 g of motor oil. Maximal efficiency for all sorbents investigated was reached after 30 min of sorption processes, it was 95.0% for NWF, 43.0% for NRWM, 20.7% for sepiolite, 19.6% for bentonite and 21.2% for zeolite. Physical adsorption onto all sorbents is a favorable process (sorption efficiency decrease with increasing temperature) while sorption onto bentonite and zeolite is a result of both physical adsorption and chemisorption (sorption efficiency increase with increasing temperature, up to 80 degrees C).",
journal = "Journal of Hazardous Materials",
title = "Governing factors for motor oil removal from water with different sorption materials",
pages = "563-558",
number = "1-3",
volume = "154",
doi = "10.1016/j.jhazmat.2007.10.066"
}

Rajaković-Ognjanović, V., Aleksić, G.,& Rajaković, L. V.. (2008). Governing factors for motor oil removal from water with different sorption materials. in Journal of Hazardous Materials, 154(1-3), 558-563.
https://doi.org/10.1016/j.jhazmat.2007.10.066

Rajaković-Ognjanović V, Aleksić G, Rajaković LV. Governing factors for motor oil removal from water with different sorption materials. in Journal of Hazardous Materials. 2008;154(1-3):558-563.
doi:10.1016/j.jhazmat.2007.10.066 .

Rajaković-Ognjanović, Vladana, Aleksić, G., Rajaković, Ljubinka V., "Governing factors for motor oil removal from water with different sorption materials" in Journal of Hazardous Materials, 154, no. 1-3 (2008):558-563,
https://doi.org/10.1016/j.jhazmat.2007.10.066 . .

TY  - JOUR
AU  - Rajaković-Ognjanović, Vladana
AU  - Aleksić, G.
AU  - Radetić, M.
AU  - Rajaković, Ljubinka V.
PY  - 2007
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/162
AB  - The aim of this paper was to investigate the efficiency of different sorbent materials for oil removal from wastewater. Two types of sorbents were investigated: organic (loose natural wool fibers (NWF) and recycled wool based nonwoven material (RWNM)) and inorganic (sepiolite). Sorption was carried out in continuous tubular contractor (initial oil concentration of 1511 mg/dm(3)) and batch tank (initial oil concentration of 5066 mg/dm(3)). Wool-based sorbents showed higher sorption capacity (5.56 g/g for NWF and 5.48 g/g for RWNM) compared to sepiolite (0.19 g/g) in case of sorption in batch tank. The study on sorption in continuous tubular contractor suggested that volume of oily wastewater strongly affected oil removal. The results indicated that the combination of extractive-gravimetric and FTIR spectrophotometric methods can be recommended for precise determination of oil concentration, being suitable as a controlling tool for oil detection.
T2  - Journal of Hazardous Materials
T1  - Efficiency of oil removal from real wastewater with different sorbent materials
EP  - 499
IS  - 1-2
SP  - 494
VL  - 143
DO  - 10.1016/j.jhazmat.2006.09.060
ER  - 

@article{
author = "Rajaković-Ognjanović, Vladana and Aleksić, G. and Radetić, M. and Rajaković, Ljubinka V.",
year = "2007",
abstract = "The aim of this paper was to investigate the efficiency of different sorbent materials for oil removal from wastewater. Two types of sorbents were investigated: organic (loose natural wool fibers (NWF) and recycled wool based nonwoven material (RWNM)) and inorganic (sepiolite). Sorption was carried out in continuous tubular contractor (initial oil concentration of 1511 mg/dm(3)) and batch tank (initial oil concentration of 5066 mg/dm(3)). Wool-based sorbents showed higher sorption capacity (5.56 g/g for NWF and 5.48 g/g for RWNM) compared to sepiolite (0.19 g/g) in case of sorption in batch tank. The study on sorption in continuous tubular contractor suggested that volume of oily wastewater strongly affected oil removal. The results indicated that the combination of extractive-gravimetric and FTIR spectrophotometric methods can be recommended for precise determination of oil concentration, being suitable as a controlling tool for oil detection.",
journal = "Journal of Hazardous Materials",
title = "Efficiency of oil removal from real wastewater with different sorbent materials",
pages = "499-494",
number = "1-2",
volume = "143",
doi = "10.1016/j.jhazmat.2006.09.060"
}

Rajaković-Ognjanović, V., Aleksić, G., Radetić, M.,& Rajaković, L. V.. (2007). Efficiency of oil removal from real wastewater with different sorbent materials. in Journal of Hazardous Materials, 143(1-2), 494-499.
https://doi.org/10.1016/j.jhazmat.2006.09.060

Rajaković-Ognjanović V, Aleksić G, Radetić M, Rajaković LV. Efficiency of oil removal from real wastewater with different sorbent materials. in Journal of Hazardous Materials. 2007;143(1-2):494-499.
doi:10.1016/j.jhazmat.2006.09.060 .

Rajaković-Ognjanović, Vladana, Aleksić, G., Radetić, M., Rajaković, Ljubinka V., "Efficiency of oil removal from real wastewater with different sorbent materials" in Journal of Hazardous Materials, 143, no. 1-2 (2007):494-499,
https://doi.org/10.1016/j.jhazmat.2006.09.060 . .