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  - 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  - 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  - 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 . .