TY  - CONF
AU  - Jelić, Ivana
AU  - Bosnjakovic, Jovana
AU  - Kostić, Aleksandar
AU  - Sljivic-Ivanovic, Marija
AU  - Dimovic, Slavko
AU  - Savić, Aleksandar R.
PY  - 2019
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/2021
AB  - The aim of this article is to review the utilization of various types of waste in geopolimerization
technology processes. The geopolymerization represents a process comprising of the dissolution of aluminosilicate solids in a strongly alkaline medium followed by condensation of free alumina-silica oligomers to form a tetrahedral polymeric structure. Advantage of this technology represents the possibility of utilization of any silica and alumina-containing waste material that could be dissolved in an alkaline solution. Production of geopolymers from waste not only provides less raw material consumption but also addresses issues regarding the disposal of wastes. Fly ash, red mud, construction and demolition waste (C&DW), slags, or mine waste are the most utilized waste types in combination with supplementary waste materials according to their characteristics. Conducted investigations showed that the use of various waste materials leads to the production of geopolymers with a broad range of final properties. Despite a high number of published Publications and patents, the large-scale utilization of waste is still missing.
PB  - University of Belgrade, Technical Faculty in Bor
C3  - Proceedings of the 51st International October Conference On Mining and Metallurgy
T1  - Utilization of Waste In Geopolimerization A Review
UR  - https://hdl.handle.net/21.15107/rcub_grafar_2021
ER  - 

@conference{
author = "Jelić, Ivana and Bosnjakovic, Jovana and Kostić, Aleksandar and Sljivic-Ivanovic, Marija and Dimovic, Slavko and Savić, Aleksandar R.",
year = "2019",
abstract = "The aim of this article is to review the utilization of various types of waste in geopolimerization
technology processes. The geopolymerization represents a process comprising of the dissolution of aluminosilicate solids in a strongly alkaline medium followed by condensation of free alumina-silica oligomers to form a tetrahedral polymeric structure. Advantage of this technology represents the possibility of utilization of any silica and alumina-containing waste material that could be dissolved in an alkaline solution. Production of geopolymers from waste not only provides less raw material consumption but also addresses issues regarding the disposal of wastes. Fly ash, red mud, construction and demolition waste (C&DW), slags, or mine waste are the most utilized waste types in combination with supplementary waste materials according to their characteristics. Conducted investigations showed that the use of various waste materials leads to the production of geopolymers with a broad range of final properties. Despite a high number of published Publications and patents, the large-scale utilization of waste is still missing.",
publisher = "University of Belgrade, Technical Faculty in Bor",
journal = "Proceedings of the 51st International October Conference On Mining and Metallurgy",
title = "Utilization of Waste In Geopolimerization A Review",
url = "https://hdl.handle.net/21.15107/rcub_grafar_2021"
}

Jelić, I., Bosnjakovic, J., Kostić, A., Sljivic-Ivanovic, M., Dimovic, S.,& Savić, A. R.. (2019). Utilization of Waste In Geopolimerization A Review. in Proceedings of the 51st International October Conference On Mining and Metallurgy
University of Belgrade, Technical Faculty in Bor..
https://hdl.handle.net/21.15107/rcub_grafar_2021

Jelić I, Bosnjakovic J, Kostić A, Sljivic-Ivanovic M, Dimovic S, Savić AR. Utilization of Waste In Geopolimerization A Review. in Proceedings of the 51st International October Conference On Mining and Metallurgy. 2019;.
https://hdl.handle.net/21.15107/rcub_grafar_2021 .

Jelić, Ivana, Bosnjakovic, Jovana, Kostić, Aleksandar, Sljivic-Ivanovic, Marija, Dimovic, Slavko, Savić, Aleksandar R., "Utilization of Waste In Geopolimerization A Review" in Proceedings of the 51st International October Conference On Mining and Metallurgy (2019),
https://hdl.handle.net/21.15107/rcub_grafar_2021 .

TY  - JOUR
AU  - Vakanjac, Boris
AU  - Jelić, Ivana
AU  - Rikalović, Milena
AU  - Ristić-Vakanjac, Vesna
AU  - Nikezić, Dušan
AU  - Naunović, Zorana
AU  - Dimović, Slavko
PY  - 2019
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/2941
AB  - The present study deals with the abundance of the most common accessory elements of radioactivity carriers on the Stara Planina mountain at four defined locations. All investigated locations have increased radioactivity, greater than 200 cps, up to 1250 cps. In all examined samples the following elements were detected and their concentrations were determined: Zr, Rb, W, Mo, Sn, Zn, Cu, As, Sb, Ba, Ni, Cr, V, and Ti. The analysis showed that depending on the sample, elevated concentrations of all detected elements except titanium were found. As all localities containing the listed detected elements are located near watercourses, all the present elements, and in particular, those with elevated concentrations can be relatively easily transferred to the environment by water action. Likewise, there is the possibility of eolic erosion from the investigated deposits and tailing dams whereby these chemical elements and/or radionuclides would be distributed to areas away from the primary sources of natural radioactivity. These have a high risk of spreading and therefore have harmful or radioecological effects on the environment. The study indicated a need for adequate monitoring, and risk assessment of the examined locations, which could prevent the distribution of these elements further into the environment.
T2  - Nuclear Technology and Radiation Protection
T1  - Investigation of accessory elements of representative petrologic radioactivity carriers at Stara Planina, Serbia
IS  - 4
VL  - 34
DO  - https://doi.org/10.2298/NTRP190709039V
ER  - 

@article{
author = "Vakanjac, Boris and Jelić, Ivana and Rikalović, Milena and Ristić-Vakanjac, Vesna and Nikezić, Dušan and Naunović, Zorana and Dimović, Slavko",
year = "2019",
abstract = "The present study deals with the abundance of the most common accessory elements of radioactivity carriers on the Stara Planina mountain at four defined locations. All investigated locations have increased radioactivity, greater than 200 cps, up to 1250 cps. In all examined samples the following elements were detected and their concentrations were determined: Zr, Rb, W, Mo, Sn, Zn, Cu, As, Sb, Ba, Ni, Cr, V, and Ti. The analysis showed that depending on the sample, elevated concentrations of all detected elements except titanium were found. As all localities containing the listed detected elements are located near watercourses, all the present elements, and in particular, those with elevated concentrations can be relatively easily transferred to the environment by water action. Likewise, there is the possibility of eolic erosion from the investigated deposits and tailing dams whereby these chemical elements and/or radionuclides would be distributed to areas away from the primary sources of natural radioactivity. These have a high risk of spreading and therefore have harmful or radioecological effects on the environment. The study indicated a need for adequate monitoring, and risk assessment of the examined locations, which could prevent the distribution of these elements further into the environment.",
journal = "Nuclear Technology and Radiation Protection",
title = "Investigation of accessory elements of representative petrologic radioactivity carriers at Stara Planina, Serbia",
number = "4",
volume = "34",
doi = "https://doi.org/10.2298/NTRP190709039V"
}

Vakanjac, B., Jelić, I., Rikalović, M., Ristić-Vakanjac, V., Nikezić, D., Naunović, Z.,& Dimović, S.. (2019). Investigation of accessory elements of representative petrologic radioactivity carriers at Stara Planina, Serbia. in Nuclear Technology and Radiation Protection, 34(4).
https://doi.org/https://doi.org/10.2298/NTRP190709039V

Vakanjac B, Jelić I, Rikalović M, Ristić-Vakanjac V, Nikezić D, Naunović Z, Dimović S. Investigation of accessory elements of representative petrologic radioactivity carriers at Stara Planina, Serbia. in Nuclear Technology and Radiation Protection. 2019;34(4).
doi:https://doi.org/10.2298/NTRP190709039V .

Vakanjac, Boris, Jelić, Ivana, Rikalović, Milena, Ristić-Vakanjac, Vesna, Nikezić, Dušan, Naunović, Zorana, Dimović, Slavko, "Investigation of accessory elements of representative petrologic radioactivity carriers at Stara Planina, Serbia" in Nuclear Technology and Radiation Protection, 34, no. 4 (2019),
https://doi.org/https://doi.org/10.2298/NTRP190709039V . .

TY  - JOUR
AU  - Karanac, Milica
AU  - Dolić, Maja B.
AU  - Veljović, Đorđe
AU  - Rajaković-Ognjanović, Vladana
AU  - Veličković, Zlate
AU  - Pavićević, Vladimir
AU  - Marinković, Aleksandar
PY  - 2018
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/937
AB  - This study focuses on the use of raw fly ash (FA) and modified fly ash - activated by lime (MFA), as effective and low-cost adsorbents for the removal of heavy metals (Zn2+, Pb2+ and As(V)), followed by the revalorization of the exhausted adsorbent. The granulometric, elemental analysis, point of zero charge (pH(pzc), radiochemical and structural characterization were conducted using X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET), scanning electron microscopy (SEM), Fourier transform infrared (FTIR) and gamma spectrometry techniques. The optimal conditions and key factors influencing the adsorption process were assessed using the response surface method (RSM). The adsorption capacity of the MFA adsorbent for Zn2+, Pb2+ and As(V) removal, calculated by the Langmuir model, was found to be 33.13, 26.06, and 29.71 mg g(-1), respectively. The kinetic and thermodynamic parameters indicated that the adsorption process is spontaneous and endothermic. Due to their low desorption potential of the exhausted adsorbents, their effective reuse was established to be feasible. For this reason, the valorization of this material as an additive in construction materials was thereafter studied, where testing its toxicity leaching (TCLP) as well as the mechanical properties of construction material containing exhausted MFA confirmed its safe use. Hence, this study points to a possible "two-in-one" reuse of coal ash, initially as an adsorbent and later as an additive in a construction material.
PB  - Elsevier Ltd
T2  - Waste Management
T1  - The removal of Zn2+, Pb2+, and As(V) ions by lime activated fly ash and valorization of the exhausted adsorbent
EP  - 378
SP  - 366
VL  - 78
DO  - 10.1016/j.wasman.2018.05.052
ER  - 

@article{
author = "Karanac, Milica and Dolić, Maja B. and Veljović, Đorđe and Rajaković-Ognjanović, Vladana and Veličković, Zlate and Pavićević, Vladimir and Marinković, Aleksandar",
year = "2018",
abstract = "This study focuses on the use of raw fly ash (FA) and modified fly ash - activated by lime (MFA), as effective and low-cost adsorbents for the removal of heavy metals (Zn2+, Pb2+ and As(V)), followed by the revalorization of the exhausted adsorbent. The granulometric, elemental analysis, point of zero charge (pH(pzc), radiochemical and structural characterization were conducted using X-ray diffraction (XRD), Brunauer-Emmett-Teller (BET), scanning electron microscopy (SEM), Fourier transform infrared (FTIR) and gamma spectrometry techniques. The optimal conditions and key factors influencing the adsorption process were assessed using the response surface method (RSM). The adsorption capacity of the MFA adsorbent for Zn2+, Pb2+ and As(V) removal, calculated by the Langmuir model, was found to be 33.13, 26.06, and 29.71 mg g(-1), respectively. The kinetic and thermodynamic parameters indicated that the adsorption process is spontaneous and endothermic. Due to their low desorption potential of the exhausted adsorbents, their effective reuse was established to be feasible. For this reason, the valorization of this material as an additive in construction materials was thereafter studied, where testing its toxicity leaching (TCLP) as well as the mechanical properties of construction material containing exhausted MFA confirmed its safe use. Hence, this study points to a possible "two-in-one" reuse of coal ash, initially as an adsorbent and later as an additive in a construction material.",
publisher = "Elsevier Ltd",
journal = "Waste Management",
title = "The removal of Zn2+, Pb2+, and As(V) ions by lime activated fly ash and valorization of the exhausted adsorbent",
pages = "378-366",
volume = "78",
doi = "10.1016/j.wasman.2018.05.052"
}

Karanac, M., Dolić, M. B., Veljović, Đ., Rajaković-Ognjanović, V., Veličković, Z., Pavićević, V.,& Marinković, A.. (2018). The removal of Zn2+, Pb2+, and As(V) ions by lime activated fly ash and valorization of the exhausted adsorbent. in Waste Management
Elsevier Ltd., 78, 366-378.
https://doi.org/10.1016/j.wasman.2018.05.052

Karanac M, Dolić MB, Veljović Đ, Rajaković-Ognjanović V, Veličković Z, Pavićević V, Marinković A. The removal of Zn2+, Pb2+, and As(V) ions by lime activated fly ash and valorization of the exhausted adsorbent. in Waste Management. 2018;78:366-378.
doi:10.1016/j.wasman.2018.05.052 .

Karanac, Milica, Dolić, Maja B., Veljović, Đorđe, Rajaković-Ognjanović, Vladana, Veličković, Zlate, Pavićević, Vladimir, Marinković, Aleksandar, "The removal of Zn2+, Pb2+, and As(V) ions by lime activated fly ash and valorization of the exhausted adsorbent" in Waste Management, 78 (2018):366-378,
https://doi.org/10.1016/j.wasman.2018.05.052 . .

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  - 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  - Cujić, Mirjana
AU  - Dragović, Snežana
AU  - Sabovljević, Marko
AU  - Slavkovic-Beskoski, Latinka
AU  - Kilibarda, Milan
AU  - Savović, Jelena
AU  - Onjia, Antonije
PY  - 2014
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/634
T2  - Clean-Soil Air Water
T1  - Use of Mosses as Biomonitors of Major, Minor and Trace Element Deposition Around the Largest Thermal Power Plant in Serbia
EP  - 11
IS  - 1
SP  - 5
VL  - 42
DO  - 10.1002/clen.201100656
ER  - 

@article{
author = "Cujić, Mirjana and Dragović, Snežana and Sabovljević, Marko and Slavkovic-Beskoski, Latinka and Kilibarda, Milan and Savović, Jelena and Onjia, Antonije",
year = "2014",
journal = "Clean-Soil Air Water",
title = "Use of Mosses as Biomonitors of Major, Minor and Trace Element Deposition Around the Largest Thermal Power Plant in Serbia",
pages = "11-5",
number = "1",
volume = "42",
doi = "10.1002/clen.201100656"
}

Cujić, M., Dragović, S., Sabovljević, M., Slavkovic-Beskoski, L., Kilibarda, M., Savović, J.,& Onjia, A.. (2014). Use of Mosses as Biomonitors of Major, Minor and Trace Element Deposition Around the Largest Thermal Power Plant in Serbia. in Clean-Soil Air Water, 42(1), 5-11.
https://doi.org/10.1002/clen.201100656

Cujić M, Dragović S, Sabovljević M, Slavkovic-Beskoski L, Kilibarda M, Savović J, Onjia A. Use of Mosses as Biomonitors of Major, Minor and Trace Element Deposition Around the Largest Thermal Power Plant in Serbia. in Clean-Soil Air Water. 2014;42(1):5-11.
doi:10.1002/clen.201100656 .

Cujić, Mirjana, Dragović, Snežana, Sabovljević, Marko, Slavkovic-Beskoski, Latinka, Kilibarda, Milan, Savović, Jelena, Onjia, Antonije, "Use of Mosses as Biomonitors of Major, Minor and Trace Element Deposition Around the Largest Thermal Power Plant in Serbia" in Clean-Soil Air Water, 42, no. 1 (2014):5-11,
https://doi.org/10.1002/clen.201100656 . .

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  - Dragović, Snežana
AU  - Cujić, Mirjana
AU  - Slavkovic-Beskoski, Latinka
AU  - Gajić, Boško
AU  - Bajat, Branislav
AU  - Kilibarda, Milan
AU  - Onjia, Antonije
PY  - 2013
UR  - https://grafar.grf.bg.ac.rs/handle/123456789/543
AB  - The content of trace elements (As, Cd, Co, Cr, Cu, Hg, Mn, Ni, Pb and Zn) in surface soils in the area surrounding the largest coal-fired power plant in Serbia was determined to assess the contribution of emissions to pollution. Analysis of mutual associations between the trace elements and their correlation with soil particle size fractions indicated anthropogenic origin at most sampling sites. Enrichment factor analysis confirmed these findings. Common patterns in trace element concentrations of the analysed soils were identified by hierarchical cluster analysis. Explanatory spatial analysis, used for characterization and mapping of spatial variability patterns, revealed the highest concentrations of trace elements in areas in predominant wind directions.
T2  - Catena
T1  - Trace element distribution in surface soils from a coal burning power production area: A case study from the largest power plant site in Serbia
EP  - 296
SP  - 288
VL  - 104
DO  - 10.1016/j.catena.2012.12.004
ER  - 

@article{
author = "Dragović, Snežana and Cujić, Mirjana and Slavkovic-Beskoski, Latinka and Gajić, Boško and Bajat, Branislav and Kilibarda, Milan and Onjia, Antonije",
year = "2013",
abstract = "The content of trace elements (As, Cd, Co, Cr, Cu, Hg, Mn, Ni, Pb and Zn) in surface soils in the area surrounding the largest coal-fired power plant in Serbia was determined to assess the contribution of emissions to pollution. Analysis of mutual associations between the trace elements and their correlation with soil particle size fractions indicated anthropogenic origin at most sampling sites. Enrichment factor analysis confirmed these findings. Common patterns in trace element concentrations of the analysed soils were identified by hierarchical cluster analysis. Explanatory spatial analysis, used for characterization and mapping of spatial variability patterns, revealed the highest concentrations of trace elements in areas in predominant wind directions.",
journal = "Catena",
title = "Trace element distribution in surface soils from a coal burning power production area: A case study from the largest power plant site in Serbia",
pages = "296-288",
volume = "104",
doi = "10.1016/j.catena.2012.12.004"
}

Dragović, S., Cujić, M., Slavkovic-Beskoski, L., Gajić, B., Bajat, B., Kilibarda, M.,& Onjia, A.. (2013). Trace element distribution in surface soils from a coal burning power production area: A case study from the largest power plant site in Serbia. in Catena, 104, 288-296.
https://doi.org/10.1016/j.catena.2012.12.004

Dragović S, Cujić M, Slavkovic-Beskoski L, Gajić B, Bajat B, Kilibarda M, Onjia A. Trace element distribution in surface soils from a coal burning power production area: A case study from the largest power plant site in Serbia. in Catena. 2013;104:288-296.
doi:10.1016/j.catena.2012.12.004 .

Dragović, Snežana, Cujić, Mirjana, Slavkovic-Beskoski, Latinka, Gajić, Boško, Bajat, Branislav, Kilibarda, Milan, Onjia, Antonije, "Trace element distribution in surface soils from a coal burning power production area: A case study from the largest power plant site in Serbia" in Catena, 104 (2013):288-296,
https://doi.org/10.1016/j.catena.2012.12.004 . .

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 . .