TY  - JOUR
AU  - Popović, Aleksandar R.
AU  - Anđelković, Boban D.
AU  - Đorđević, Dragana S.
AU  - Sakan, Sanja M.
AU  - Vujisić, Ljubodrag V.
AU  - Veličković, Sava
AU  - Relić, Dubravka
PY  - 2022
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5377
AB  - In order to further define the potential use of FTIR-ATR spectroscopy, as a non-destructive and reliable technique, for the analysis of the characteristics of post stamps, certified originals of the Principality of Serbia stamps (“Prince Michael issues”) issued in 1866 and 1868 as well as their forgeries were ana­lyzed. Spectra enabling the comparison of the paper, dye and glue of stamps of so-called “Vienna issues”, having denominations of 10 (orange-yellow), 20 (pink) and 40 para (blue) and “Belgrade issues” (1 para-green and 2 para-reddish brown), as well as 24 expert-certified forgeries, were taken. It was shown that the applied technology was, in most of the cases, a fast and suitable technique for establishing clear differences between the spectral characteristics of the paper and dye used for the original stamps, and forgeries that were most probably made decades after the printing of the genuine stamps. The differences between print­ings of the same issues of the genuine stamps were also elaborated. It is pro­posed, for the first time in philatelic history, the possibility that “Vienna issues” stamps may have been printed on two different papers, and, having in mind the technology of printing in the 19th century, potentially, not even at the same time or in the same printing house.
T2  - Journal of the Serbian Chemical Society
T1  - To Professor Petar Pfendt, In calidum, et plurium retributivus memoriae: FTIR-ATR analysis of post stamps of the Principality of Serbia issued in 1866 and 1868 and their forgeries
EP  - 40
IS  - 1
SP  - 27
VL  - 87
DO  - 10.2298/JSC210901090P
ER  - 

@article{
author = "Popović, Aleksandar R. and Anđelković, Boban D. and Đorđević, Dragana S. and Sakan, Sanja M. and Vujisić, Ljubodrag V. and Veličković, Sava and Relić, Dubravka",
year = "2022",
abstract = "In order to further define the potential use of FTIR-ATR spectroscopy, as a non-destructive and reliable technique, for the analysis of the characteristics of post stamps, certified originals of the Principality of Serbia stamps (“Prince Michael issues”) issued in 1866 and 1868 as well as their forgeries were ana­lyzed. Spectra enabling the comparison of the paper, dye and glue of stamps of so-called “Vienna issues”, having denominations of 10 (orange-yellow), 20 (pink) and 40 para (blue) and “Belgrade issues” (1 para-green and 2 para-reddish brown), as well as 24 expert-certified forgeries, were taken. It was shown that the applied technology was, in most of the cases, a fast and suitable technique for establishing clear differences between the spectral characteristics of the paper and dye used for the original stamps, and forgeries that were most probably made decades after the printing of the genuine stamps. The differences between print­ings of the same issues of the genuine stamps were also elaborated. It is pro­posed, for the first time in philatelic history, the possibility that “Vienna issues” stamps may have been printed on two different papers, and, having in mind the technology of printing in the 19th century, potentially, not even at the same time or in the same printing house.",
journal = "Journal of the Serbian Chemical Society",
title = "To Professor Petar Pfendt, In calidum, et plurium retributivus memoriae: FTIR-ATR analysis of post stamps of the Principality of Serbia issued in 1866 and 1868 and their forgeries",
pages = "40-27",
number = "1",
volume = "87",
doi = "10.2298/JSC210901090P"
}

Popović, A. R., Anđelković, B. D., Đorđević, D. S., Sakan, S. M., Vujisić, L. V., Veličković, S.,& Relić, D.. (2022). To Professor Petar Pfendt, In calidum, et plurium retributivus memoriae: FTIR-ATR analysis of post stamps of the Principality of Serbia issued in 1866 and 1868 and their forgeries. in Journal of the Serbian Chemical Society, 87(1), 27-40.
https://doi.org/10.2298/JSC210901090P

Popović AR, Anđelković BD, Đorđević DS, Sakan SM, Vujisić LV, Veličković S, Relić D. To Professor Petar Pfendt, In calidum, et plurium retributivus memoriae: FTIR-ATR analysis of post stamps of the Principality of Serbia issued in 1866 and 1868 and their forgeries. in Journal of the Serbian Chemical Society. 2022;87(1):27-40.
doi:10.2298/JSC210901090P .

Popović, Aleksandar R., Anđelković, Boban D., Đorđević, Dragana S., Sakan, Sanja M., Vujisić, Ljubodrag V., Veličković, Sava, Relić, Dubravka, "To Professor Petar Pfendt, In calidum, et plurium retributivus memoriae: FTIR-ATR analysis of post stamps of the Principality of Serbia issued in 1866 and 1868 and their forgeries" in Journal of the Serbian Chemical Society, 87, no. 1 (2022):27-40,
https://doi.org/10.2298/JSC210901090P . .

TY  - JOUR
AU  - Marković, Jelena P.
AU  - Jović, Mihajlo D.
AU  - Smičiklas, Ivana D.
AU  - Šljivić-Ivanović, Marija Z.
AU  - Onjia, Antonije
AU  - Trivunac, Katarina
AU  - Popović, Aleksandar R.
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4166
AB  - As soil cadmium (Cd) contamination becomes a serious concern and one of the significant environmental pollution issues all over the world, knowledge of the basic chemistry, origin, inputs, sources, quantity, chemical forms, reactions, as well as the fate and transport of Cd in different types of soil is crucial for better understanding Cd bioavailability, health risks and remedial options. This study aimed to increase the current knowledge on the complex interdependence between the factors affecting behavior, transport and fate of Cd in the soil and to test and compare the performance of the stabilization agents in different soil types. Soils demonstrated various sorption affinity and capacity for Cd accumulation, which proved to be positively correlated with soil pH and the cation exchange capacity (CEC). With increasing levels of contamination, sequential extraction analysis showed the highest increase of relative Cd amounts in the exchangeable fraction regardless of the soil properties, suggesting that added Cd is principally associated with the easily accessible and mobile fraction. For different initial Cd concentrations and soil types, Cd sorption reached the quasi-equilibrium within 24 h of contact. Prolonged aging (two months) influenced the natural stabilization of Cd in all types of soil, but only at low contamination level. The application of both, conventional (slaked lime Ca(OH)(2)) and alternative phosphate-rich (annealed bovine bones B-400) amendments, resulted in Cd relocation and reduction of exchangeable Cd content. Although the effect was smaller when apatite amendment was utilized, observed redistribution of Cd to more stable soil fractions is preferable for achieving long-term stabilization. Cd concentrations extracted in exchangeable and acid soluble fractions after the treatments of contaminated soil samples suggest that the practical applicability of in situ immobilization depends on the soil properties and the level of contamination, as well as that effect, should be monitored for the possible re-mobilization of Cd.
PB  - Academic Press Inc Elsevier Science, San Diego
T2  - Ecotoxicology and Environmental Safety
T1  - Cadmium retention and distribution in contaminated soil: effects and interactions of soil properties, contamination level, aging time and in situ immobilization agents
EP  - 314
SP  - 305
VL  - 174
DO  - 10.1016/j.ecoenv.2019.03.001
ER  - 

@article{
author = "Marković, Jelena P. and Jović, Mihajlo D. and Smičiklas, Ivana D. and Šljivić-Ivanović, Marija Z. and Onjia, Antonije and Trivunac, Katarina and Popović, Aleksandar R.",
year = "2019",
abstract = "As soil cadmium (Cd) contamination becomes a serious concern and one of the significant environmental pollution issues all over the world, knowledge of the basic chemistry, origin, inputs, sources, quantity, chemical forms, reactions, as well as the fate and transport of Cd in different types of soil is crucial for better understanding Cd bioavailability, health risks and remedial options. This study aimed to increase the current knowledge on the complex interdependence between the factors affecting behavior, transport and fate of Cd in the soil and to test and compare the performance of the stabilization agents in different soil types. Soils demonstrated various sorption affinity and capacity for Cd accumulation, which proved to be positively correlated with soil pH and the cation exchange capacity (CEC). With increasing levels of contamination, sequential extraction analysis showed the highest increase of relative Cd amounts in the exchangeable fraction regardless of the soil properties, suggesting that added Cd is principally associated with the easily accessible and mobile fraction. For different initial Cd concentrations and soil types, Cd sorption reached the quasi-equilibrium within 24 h of contact. Prolonged aging (two months) influenced the natural stabilization of Cd in all types of soil, but only at low contamination level. The application of both, conventional (slaked lime Ca(OH)(2)) and alternative phosphate-rich (annealed bovine bones B-400) amendments, resulted in Cd relocation and reduction of exchangeable Cd content. Although the effect was smaller when apatite amendment was utilized, observed redistribution of Cd to more stable soil fractions is preferable for achieving long-term stabilization. Cd concentrations extracted in exchangeable and acid soluble fractions after the treatments of contaminated soil samples suggest that the practical applicability of in situ immobilization depends on the soil properties and the level of contamination, as well as that effect, should be monitored for the possible re-mobilization of Cd.",
publisher = "Academic Press Inc Elsevier Science, San Diego",
journal = "Ecotoxicology and Environmental Safety",
title = "Cadmium retention and distribution in contaminated soil: effects and interactions of soil properties, contamination level, aging time and in situ immobilization agents",
pages = "314-305",
volume = "174",
doi = "10.1016/j.ecoenv.2019.03.001"
}

Marković, J. P., Jović, M. D., Smičiklas, I. D., Šljivić-Ivanović, M. Z., Onjia, A., Trivunac, K.,& Popović, A. R.. (2019). Cadmium retention and distribution in contaminated soil: effects and interactions of soil properties, contamination level, aging time and in situ immobilization agents. in Ecotoxicology and Environmental Safety
Academic Press Inc Elsevier Science, San Diego., 174, 305-314.
https://doi.org/10.1016/j.ecoenv.2019.03.001

Marković JP, Jović MD, Smičiklas ID, Šljivić-Ivanović MZ, Onjia A, Trivunac K, Popović AR. Cadmium retention and distribution in contaminated soil: effects and interactions of soil properties, contamination level, aging time and in situ immobilization agents. in Ecotoxicology and Environmental Safety. 2019;174:305-314.
doi:10.1016/j.ecoenv.2019.03.001 .

Marković, Jelena P., Jović, Mihajlo D., Smičiklas, Ivana D., Šljivić-Ivanović, Marija Z., Onjia, Antonije, Trivunac, Katarina, Popović, Aleksandar R., "Cadmium retention and distribution in contaminated soil: effects and interactions of soil properties, contamination level, aging time and in situ immobilization agents" in Ecotoxicology and Environmental Safety, 174 (2019):305-314,
https://doi.org/10.1016/j.ecoenv.2019.03.001 . .

TY  - JOUR
AU  - Suručić, Ljiljana T.
AU  - Nastasović, Aleksandra
AU  - Rakić, Aleksandra
AU  - Onjia, Antonije
AU  - Popović, Aleksandar R.
AU  - Janjić, Goran
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4197
PB  - 5th World Congress on Mechanical, Chemical, and Material Engineering, MCM 2019
T2  - Proceedings of the World Congress on Mechanical, Chemical, and Material Engineering
T1  - Comparative study of W(VI) and Cr(VI) oxyanions binding ability with magnetic polymer nanocomposite
DO  - 10.11159/iccpe19.125
ER  - 

@article{
author = "Suručić, Ljiljana T. and Nastasović, Aleksandra and Rakić, Aleksandra and Onjia, Antonije and Popović, Aleksandar R. and Janjić, Goran",
year = "2019",
publisher = "5th World Congress on Mechanical, Chemical, and Material Engineering, MCM 2019",
journal = "Proceedings of the World Congress on Mechanical, Chemical, and Material Engineering",
title = "Comparative study of W(VI) and Cr(VI) oxyanions binding ability with magnetic polymer nanocomposite",
doi = "10.11159/iccpe19.125"
}

Suručić, L. T., Nastasović, A., Rakić, A., Onjia, A., Popović, A. R.,& Janjić, G.. (2019). Comparative study of W(VI) and Cr(VI) oxyanions binding ability with magnetic polymer nanocomposite. in Proceedings of the World Congress on Mechanical, Chemical, and Material Engineering
5th World Congress on Mechanical, Chemical, and Material Engineering, MCM 2019..
https://doi.org/10.11159/iccpe19.125

Suručić LT, Nastasović A, Rakić A, Onjia A, Popović AR, Janjić G. Comparative study of W(VI) and Cr(VI) oxyanions binding ability with magnetic polymer nanocomposite. in Proceedings of the World Congress on Mechanical, Chemical, and Material Engineering. 2019;.
doi:10.11159/iccpe19.125 .

Suručić, Ljiljana T., Nastasović, Aleksandra, Rakić, Aleksandra, Onjia, Antonije, Popović, Aleksandar R., Janjić, Goran, "Comparative study of W(VI) and Cr(VI) oxyanions binding ability with magnetic polymer nanocomposite" in Proceedings of the World Congress on Mechanical, Chemical, and Material Engineering (2019),
https://doi.org/10.11159/iccpe19.125 . .

TY  - JOUR
AU  - Suručić, Ljiljana T.
AU  - Janjić, Goran
AU  - Rakić, Aleksandra
AU  - Nastasović, Aleksandra
AU  - Popović, Aleksandar R.
AU  - Milčić, Miloš
AU  - Onjia, Antonije
PY  - 2019
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/4217
AB  - With regard to the harmful effects of heavy metals on human health and the environment, the demand for synthesis and investigation of macromolecules with large capacity of harmful substances sorption is ever greater. Quantum-chemical methods may be applied in structural modeling, prediction, and characterization of such molecules and reactions. Sorption of metal ions (Cu2+, Cd2+, Co2+, and Ni2+) to triethylenetetramine-functionalized copolymer poly(GMA-co-EGDMA)-teta was successfully modeled by quantum chemical calculations, at the B3LYP//6-311++G**/lanl2dz level. Optimized structures of metal complexes were used for calculation of real binding energy of metal ion within the complex (Er). Solvent and hydrolyzation effects were essential for obtaining the objective values. Solvent effect was included in Er by using the total solvation energy for reaction of formation of tetaOH complex (Es1, the first approach) or by using dehydration energy of free metal ion (Es2, the second approach). Experimental results were confirmed in our theoretical analyses (using the second approach).
PB  - Springer, New York
T2  - Journal of Molecular Modeling
T1  - Theoretical modeling of sorption of metal ions on amino-functionalized macroporous copolymer in aqueous solution
IS  - 6
VL  - 25
DO  - 10.1007/s00894-019-4053-0
ER  - 

@article{
author = "Suručić, Ljiljana T. and Janjić, Goran and Rakić, Aleksandra and Nastasović, Aleksandra and Popović, Aleksandar R. and Milčić, Miloš and Onjia, Antonije",
year = "2019",
abstract = "With regard to the harmful effects of heavy metals on human health and the environment, the demand for synthesis and investigation of macromolecules with large capacity of harmful substances sorption is ever greater. Quantum-chemical methods may be applied in structural modeling, prediction, and characterization of such molecules and reactions. Sorption of metal ions (Cu2+, Cd2+, Co2+, and Ni2+) to triethylenetetramine-functionalized copolymer poly(GMA-co-EGDMA)-teta was successfully modeled by quantum chemical calculations, at the B3LYP//6-311++G**/lanl2dz level. Optimized structures of metal complexes were used for calculation of real binding energy of metal ion within the complex (Er). Solvent and hydrolyzation effects were essential for obtaining the objective values. Solvent effect was included in Er by using the total solvation energy for reaction of formation of tetaOH complex (Es1, the first approach) or by using dehydration energy of free metal ion (Es2, the second approach). Experimental results were confirmed in our theoretical analyses (using the second approach).",
publisher = "Springer, New York",
journal = "Journal of Molecular Modeling",
title = "Theoretical modeling of sorption of metal ions on amino-functionalized macroporous copolymer in aqueous solution",
number = "6",
volume = "25",
doi = "10.1007/s00894-019-4053-0"
}

Suručić, L. T., Janjić, G., Rakić, A., Nastasović, A., Popović, A. R., Milčić, M.,& Onjia, A.. (2019). Theoretical modeling of sorption of metal ions on amino-functionalized macroporous copolymer in aqueous solution. in Journal of Molecular Modeling
Springer, New York., 25(6).
https://doi.org/10.1007/s00894-019-4053-0

Suručić LT, Janjić G, Rakić A, Nastasović A, Popović AR, Milčić M, Onjia A. Theoretical modeling of sorption of metal ions on amino-functionalized macroporous copolymer in aqueous solution. in Journal of Molecular Modeling. 2019;25(6).
doi:10.1007/s00894-019-4053-0 .

Suručić, Ljiljana T., Janjić, Goran, Rakić, Aleksandra, Nastasović, Aleksandra, Popović, Aleksandar R., Milčić, Miloš, Onjia, Antonije, "Theoretical modeling of sorption of metal ions on amino-functionalized macroporous copolymer in aqueous solution" in Journal of Molecular Modeling, 25, no. 6 (2019),
https://doi.org/10.1007/s00894-019-4053-0 . .

TY  - JOUR
AU  - Marković, Jelena P.
AU  - Jović, Mihajlo D.
AU  - Smičiklas, Ivana D.
AU  - Šljivić-Ivanović, Marija Z.
AU  - Smiljanić, Slavko N.
AU  - Onjia, Antonije
AU  - Popović, Aleksandar R.
PY  - 2018
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3958
AB  - The objective of the present study was to determine the impact of cadmium (Cd) concentration in the soil on its uptake by tobacco plants, and to compare the ability of diverse extraction procedures for determining Cd bioavailability and predicting soil-to-plant transfer and Cd plant concentrations. The pseudo-total digestion procedure, modified Tessier sequential extraction and six standard single-extraction tests for estimation of metal mobility and bioavailability were used for the leaching of Cd from a native soil, as well as samples artificially contaminated over a wide range of Cd concentrations. The results of various leaching tests were compared between each other, as well as with the amounts of Cd taken up by tobacco plants in pot experiments. In the native soil sample, most of the Cd was found in fractions not readily available under natural conditions, but with increasing pollution level, Cd amounts in readily available forms increased. With increasing concentrations of Cd in the soil, the quantity of pollutant taken up in tobacco also increased, while the transfer factor (TF) decreased. Linear and non-linear empirical models were developed for predicting the uptake of Cd by tobacco plants based on the results of selected leaching tests. The non-linear equations for ISO 14870 (diethylenetriaminepentaacetic acid extraction - DTPA), ISO/TS 21268-2 (CaCl2 leaching procedure), US EPA 1311 (toxicity characteristic leaching procedure - TCLP) single step extractions, and the sum of the first two fractions of the sequential extraction, exhibited the best correlation with the experimentally determined concentrations of Cd in plants over the entire range of pollutant concentrations. This approach can improve and facilitate the assessment of human exposure to Cd by tobacco smoking, but may also have wider applicability in predicting soil-to-plant transfer.
PB  - Taylor & Francis Inc, Philadelphia
T2  - Journal of Environmental Science and Health Part A-Toxic/Hazardous Substances & Environmental Engine
T1  - Estimation of Cadmium uptake by tobacco plants from laboratory leaching tests
EP  - 361
IS  - 4
SP  - 352
VL  - 53
DO  - 10.1080/10934529.2017.1401396
ER  - 

@article{
author = "Marković, Jelena P. and Jović, Mihajlo D. and Smičiklas, Ivana D. and Šljivić-Ivanović, Marija Z. and Smiljanić, Slavko N. and Onjia, Antonije and Popović, Aleksandar R.",
year = "2018",
abstract = "The objective of the present study was to determine the impact of cadmium (Cd) concentration in the soil on its uptake by tobacco plants, and to compare the ability of diverse extraction procedures for determining Cd bioavailability and predicting soil-to-plant transfer and Cd plant concentrations. The pseudo-total digestion procedure, modified Tessier sequential extraction and six standard single-extraction tests for estimation of metal mobility and bioavailability were used for the leaching of Cd from a native soil, as well as samples artificially contaminated over a wide range of Cd concentrations. The results of various leaching tests were compared between each other, as well as with the amounts of Cd taken up by tobacco plants in pot experiments. In the native soil sample, most of the Cd was found in fractions not readily available under natural conditions, but with increasing pollution level, Cd amounts in readily available forms increased. With increasing concentrations of Cd in the soil, the quantity of pollutant taken up in tobacco also increased, while the transfer factor (TF) decreased. Linear and non-linear empirical models were developed for predicting the uptake of Cd by tobacco plants based on the results of selected leaching tests. The non-linear equations for ISO 14870 (diethylenetriaminepentaacetic acid extraction - DTPA), ISO/TS 21268-2 (CaCl2 leaching procedure), US EPA 1311 (toxicity characteristic leaching procedure - TCLP) single step extractions, and the sum of the first two fractions of the sequential extraction, exhibited the best correlation with the experimentally determined concentrations of Cd in plants over the entire range of pollutant concentrations. This approach can improve and facilitate the assessment of human exposure to Cd by tobacco smoking, but may also have wider applicability in predicting soil-to-plant transfer.",
publisher = "Taylor & Francis Inc, Philadelphia",
journal = "Journal of Environmental Science and Health Part A-Toxic/Hazardous Substances & Environmental Engine",
title = "Estimation of Cadmium uptake by tobacco plants from laboratory leaching tests",
pages = "361-352",
number = "4",
volume = "53",
doi = "10.1080/10934529.2017.1401396"
}

Marković, J. P., Jović, M. D., Smičiklas, I. D., Šljivić-Ivanović, M. Z., Smiljanić, S. N., Onjia, A.,& Popović, A. R.. (2018). Estimation of Cadmium uptake by tobacco plants from laboratory leaching tests. in Journal of Environmental Science and Health Part A-Toxic/Hazardous Substances & Environmental Engine
Taylor & Francis Inc, Philadelphia., 53(4), 352-361.
https://doi.org/10.1080/10934529.2017.1401396

Marković JP, Jović MD, Smičiklas ID, Šljivić-Ivanović MZ, Smiljanić SN, Onjia A, Popović AR. Estimation of Cadmium uptake by tobacco plants from laboratory leaching tests. in Journal of Environmental Science and Health Part A-Toxic/Hazardous Substances & Environmental Engine. 2018;53(4):352-361.
doi:10.1080/10934529.2017.1401396 .

Marković, Jelena P., Jović, Mihajlo D., Smičiklas, Ivana D., Šljivić-Ivanović, Marija Z., Smiljanić, Slavko N., Onjia, Antonije, Popović, Aleksandar R., "Estimation of Cadmium uptake by tobacco plants from laboratory leaching tests" in Journal of Environmental Science and Health Part A-Toxic/Hazardous Substances & Environmental Engine, 53, no. 4 (2018):352-361,
https://doi.org/10.1080/10934529.2017.1401396 . .

TY  - JOUR
AU  - Panić, Vesna
AU  - Seslija, Sanja I.
AU  - Popović, Ivanka
AU  - Spasojević, Vuk D.
AU  - Popović, Aleksandar R.
AU  - Nikolić, Vladimir B.
AU  - Spasojević, Pavle
PY  - 2017
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3728
AB  - For the preparation of fully biobased unsaturated polyester resins (UPRs), the replacement of styrene with alternate nonpetroleum-based monomers turned out to be one of the most challenging tasks. Its complexity lies in the fact that reactive diluents (RD) have to have low viscosity and volatility, good compatibility with prepolymer, and capability to homopolymerize and copolymerize with its unsaturations. In this context, we directed our efforts to develop fully biobased UPRs using the dialkyl itaconates as an alternative to styrene. Therefore, a series of 100% biobased UPRs were prepared from itaconic acid and 1,2-propandiol and diluted by dialkyl itaconates. The resins were characterized by Fourier transform infrared spectroscopy, NMR, volatility, and viscosity measurements, while the cured samples were characterized by dynamic mechanical properties, thermomechanical analysis, thermogravimetric analysis data, and tensile tests. The influence of RD structure on the properties of cured samples was discussed in detail. It was shown that the prepared resins had evaporation rates of dialkyl itaconates of several orders of magnitude less compared to styrene. The cured resins with dimethyl itaconate showed comparable or even better thermal and mechanical properties compared to the one with styrene. This investigation showed that itaconic acid and dialkyl itaconates are promising bioresources for the preparation of fully biobased UPRs for mass consumption.
PB  - Amer Chemical Soc, Washington
T2  - Biomacromolecules
T1  - Simple One-Pot Synthesis of Fully Biobased Unsaturated Polyester Resins Based on Itaconic Acid
EP  - 3891
IS  - 12
SP  - 3881
VL  - 18
DO  - 10.1021/acs.biomac.7b00840
ER  - 

@article{
author = "Panić, Vesna and Seslija, Sanja I. and Popović, Ivanka and Spasojević, Vuk D. and Popović, Aleksandar R. and Nikolić, Vladimir B. and Spasojević, Pavle",
year = "2017",
abstract = "For the preparation of fully biobased unsaturated polyester resins (UPRs), the replacement of styrene with alternate nonpetroleum-based monomers turned out to be one of the most challenging tasks. Its complexity lies in the fact that reactive diluents (RD) have to have low viscosity and volatility, good compatibility with prepolymer, and capability to homopolymerize and copolymerize with its unsaturations. In this context, we directed our efforts to develop fully biobased UPRs using the dialkyl itaconates as an alternative to styrene. Therefore, a series of 100% biobased UPRs were prepared from itaconic acid and 1,2-propandiol and diluted by dialkyl itaconates. The resins were characterized by Fourier transform infrared spectroscopy, NMR, volatility, and viscosity measurements, while the cured samples were characterized by dynamic mechanical properties, thermomechanical analysis, thermogravimetric analysis data, and tensile tests. The influence of RD structure on the properties of cured samples was discussed in detail. It was shown that the prepared resins had evaporation rates of dialkyl itaconates of several orders of magnitude less compared to styrene. The cured resins with dimethyl itaconate showed comparable or even better thermal and mechanical properties compared to the one with styrene. This investigation showed that itaconic acid and dialkyl itaconates are promising bioresources for the preparation of fully biobased UPRs for mass consumption.",
publisher = "Amer Chemical Soc, Washington",
journal = "Biomacromolecules",
title = "Simple One-Pot Synthesis of Fully Biobased Unsaturated Polyester Resins Based on Itaconic Acid",
pages = "3891-3881",
number = "12",
volume = "18",
doi = "10.1021/acs.biomac.7b00840"
}

Panić, V., Seslija, S. I., Popović, I., Spasojević, V. D., Popović, A. R., Nikolić, V. B.,& Spasojević, P.. (2017). Simple One-Pot Synthesis of Fully Biobased Unsaturated Polyester Resins Based on Itaconic Acid. in Biomacromolecules
Amer Chemical Soc, Washington., 18(12), 3881-3891.
https://doi.org/10.1021/acs.biomac.7b00840

Panić V, Seslija SI, Popović I, Spasojević VD, Popović AR, Nikolić VB, Spasojević P. Simple One-Pot Synthesis of Fully Biobased Unsaturated Polyester Resins Based on Itaconic Acid. in Biomacromolecules. 2017;18(12):3881-3891.
doi:10.1021/acs.biomac.7b00840 .

Panić, Vesna, Seslija, Sanja I., Popović, Ivanka, Spasojević, Vuk D., Popović, Aleksandar R., Nikolić, Vladimir B., Spasojević, Pavle, "Simple One-Pot Synthesis of Fully Biobased Unsaturated Polyester Resins Based on Itaconic Acid" in Biomacromolecules, 18, no. 12 (2017):3881-3891,
https://doi.org/10.1021/acs.biomac.7b00840 . .

TY  - JOUR
AU  - Marković, Jelena P.
AU  - Jović, Mihajlo D.
AU  - Smičiklas, Ivana D.
AU  - Pezo, Lato
AU  - Šljivić-Ivanović, Marija Z.
AU  - Onjia, Antonije
AU  - Popović, Aleksandar R.
PY  - 2016
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/3261
AB  - The distribution of elements in soil fractions affects their mobility and availability and thus their potential beneficial or harmful impact on ecosystems, biota and humans. Different mineralogical and chemical characteristics of soil influence elemental distribution. In the present study, chemical speciation of macro and micro elements (Al, Fe, Mn, K, Cd, Cr, Cu, Li, Ba, Ni, Pb and Zn) in unpolluted soils of different types, collected from the territory of the Republic of Serbia, were analysed by sequential extraction procedure. The impact of the physicochemical soil properties on the content, distribution, mobility and availability of elements was investigated. Principal component analysis was employed for the evaluation and characterization of the experimental data, understanding of the relationships between soil properties and the distribution, affiliation and connection of the elements. Finally, an artificial neural network (ANN) model was developed to explore the applicability of this approach for the prediction of the elemental distribution based on soil properties. Good agreement between the model and the experimental results implied that the ANN could be considered as a useful tool for control and prediction purposes.
PB  - Elsevier Science Bv, Amsterdam
T2  - Journal of Geochemical Exploration
T1  - Chemical speciation of metals in unpolluted soils of different types: Correlation with soil characteristics and an ANN modelling approach
EP  - 80
SP  - 71
VL  - 165
DO  - 10.1016/j.gexplo.2016.03.004
ER  - 

@article{
author = "Marković, Jelena P. and Jović, Mihajlo D. and Smičiklas, Ivana D. and Pezo, Lato and Šljivić-Ivanović, Marija Z. and Onjia, Antonije and Popović, Aleksandar R.",
year = "2016",
abstract = "The distribution of elements in soil fractions affects their mobility and availability and thus their potential beneficial or harmful impact on ecosystems, biota and humans. Different mineralogical and chemical characteristics of soil influence elemental distribution. In the present study, chemical speciation of macro and micro elements (Al, Fe, Mn, K, Cd, Cr, Cu, Li, Ba, Ni, Pb and Zn) in unpolluted soils of different types, collected from the territory of the Republic of Serbia, were analysed by sequential extraction procedure. The impact of the physicochemical soil properties on the content, distribution, mobility and availability of elements was investigated. Principal component analysis was employed for the evaluation and characterization of the experimental data, understanding of the relationships between soil properties and the distribution, affiliation and connection of the elements. Finally, an artificial neural network (ANN) model was developed to explore the applicability of this approach for the prediction of the elemental distribution based on soil properties. Good agreement between the model and the experimental results implied that the ANN could be considered as a useful tool for control and prediction purposes.",
publisher = "Elsevier Science Bv, Amsterdam",
journal = "Journal of Geochemical Exploration",
title = "Chemical speciation of metals in unpolluted soils of different types: Correlation with soil characteristics and an ANN modelling approach",
pages = "80-71",
volume = "165",
doi = "10.1016/j.gexplo.2016.03.004"
}

Marković, J. P., Jović, M. D., Smičiklas, I. D., Pezo, L., Šljivić-Ivanović, M. Z., Onjia, A.,& Popović, A. R.. (2016). Chemical speciation of metals in unpolluted soils of different types: Correlation with soil characteristics and an ANN modelling approach. in Journal of Geochemical Exploration
Elsevier Science Bv, Amsterdam., 165, 71-80.
https://doi.org/10.1016/j.gexplo.2016.03.004

Marković JP, Jović MD, Smičiklas ID, Pezo L, Šljivić-Ivanović MZ, Onjia A, Popović AR. Chemical speciation of metals in unpolluted soils of different types: Correlation with soil characteristics and an ANN modelling approach. in Journal of Geochemical Exploration. 2016;165:71-80.
doi:10.1016/j.gexplo.2016.03.004 .

Marković, Jelena P., Jović, Mihajlo D., Smičiklas, Ivana D., Pezo, Lato, Šljivić-Ivanović, Marija Z., Onjia, Antonije, Popović, Aleksandar R., "Chemical speciation of metals in unpolluted soils of different types: Correlation with soil characteristics and an ANN modelling approach" in Journal of Geochemical Exploration, 165 (2016):71-80,
https://doi.org/10.1016/j.gexplo.2016.03.004 . .

TY  - JOUR
AU  - Nikolić, Vladimir
AU  - Veličković, Sava
AU  - Popović, Aleksandar R.
PY  - 2014
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5777
AB  - Polystyrene graft corn starch copolymers (PS-g-starch) were synthesized by emulsion polymerization using sodium dodecylsulfate (SDS) as the emulsifier and potassium persulfate (PPS) as the initiator. Influences of temperature (25-75 A degrees C), monomer (0.56-0.96 mol/dm(3)) and initiator (0.007-0.020 mol/dm(3)) concentration, reaction time (15-300 min), and type of amine activator and its concentration (0.005-0.08 mol/dm(3)) on the percentage of grafting (G, %) and yield (Y, %) were investigated. Amines showed dual impact on grafting reaction, some of them were activators and other were inhibitors, where N,N-dimethylethanolamine gave the maximal and 1-(2-hydroxyethyl) piperazine gave the minimal value of percentage of grafting. The maximum percentage of grafting was 32.55 %, while in case of piperazine derivate percentage of grafting was zero. Successful grafting was confirmed by Fourier Transform Infrared Spectroscopy (FTIR) and Scanning Electron Microscopy (SEM). The maximum percentage of grafting was obtained under the following reaction conditions: 10.00 g of starch, monomer concentration was 0.96 mol/dm(3), initiator concentration was 0.015 mol/dm(3), reaction time was 15 min, temperature of 75 A degrees C, and N,N-dimethylethanolamine was used as activator in concentration of 0.01 mol/dm(3).
PB  - Springer, Dordrecht
T2  - Journal of Polymer Research
T1  - Influence of amine activators and reaction parameters on grafting reaction between polystyrene and starch
IS  - 2
SP  - 363
VL  - 21
DO  - 10.1007/s10965-014-0363-1
ER  - 

@article{
author = "Nikolić, Vladimir and Veličković, Sava and Popović, Aleksandar R.",
year = "2014",
abstract = "Polystyrene graft corn starch copolymers (PS-g-starch) were synthesized by emulsion polymerization using sodium dodecylsulfate (SDS) as the emulsifier and potassium persulfate (PPS) as the initiator. Influences of temperature (25-75 A degrees C), monomer (0.56-0.96 mol/dm(3)) and initiator (0.007-0.020 mol/dm(3)) concentration, reaction time (15-300 min), and type of amine activator and its concentration (0.005-0.08 mol/dm(3)) on the percentage of grafting (G, %) and yield (Y, %) were investigated. Amines showed dual impact on grafting reaction, some of them were activators and other were inhibitors, where N,N-dimethylethanolamine gave the maximal and 1-(2-hydroxyethyl) piperazine gave the minimal value of percentage of grafting. The maximum percentage of grafting was 32.55 %, while in case of piperazine derivate percentage of grafting was zero. Successful grafting was confirmed by Fourier Transform Infrared Spectroscopy (FTIR) and Scanning Electron Microscopy (SEM). The maximum percentage of grafting was obtained under the following reaction conditions: 10.00 g of starch, monomer concentration was 0.96 mol/dm(3), initiator concentration was 0.015 mol/dm(3), reaction time was 15 min, temperature of 75 A degrees C, and N,N-dimethylethanolamine was used as activator in concentration of 0.01 mol/dm(3).",
publisher = "Springer, Dordrecht",
journal = "Journal of Polymer Research",
title = "Influence of amine activators and reaction parameters on grafting reaction between polystyrene and starch",
number = "2",
pages = "363",
volume = "21",
doi = "10.1007/s10965-014-0363-1"
}

Nikolić, V., Veličković, S.,& Popović, A. R.. (2014). Influence of amine activators and reaction parameters on grafting reaction between polystyrene and starch. in Journal of Polymer Research
Springer, Dordrecht., 21(2), 363.
https://doi.org/10.1007/s10965-014-0363-1

Nikolić V, Veličković S, Popović AR. Influence of amine activators and reaction parameters on grafting reaction between polystyrene and starch. in Journal of Polymer Research. 2014;21(2):363.
doi:10.1007/s10965-014-0363-1 .

Nikolić, Vladimir, Veličković, Sava, Popović, Aleksandar R., "Influence of amine activators and reaction parameters on grafting reaction between polystyrene and starch" in Journal of Polymer Research, 21, no. 2 (2014):363,
https://doi.org/10.1007/s10965-014-0363-1 . .

TY  - JOUR
AU  - Nikolić, Vladimir
AU  - Veličković, Sava
AU  - Antonović, Dušan G.
AU  - Popović, Aleksandar R.
PY  - 2013
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5678
AB  - In this paper, a biodegradation study of grafted copolymers of cornstarch and polystyrene (PS) and cornstarch and poly(methacrylic acid) in model river water is described. These copolymers were obtained in the presence of different amine activators. The synthesized copolymers and products of degradation were characterized by Fourier transform infrared (FTIR) spectroscopy and scanning electron microscopy (SEM). Biodegradation was monitored by mass decrease and the number of microorganisms by the Koch method. Biodegradation of both copolymers advanced with time, the starch-graft-poly(methacrylic acid) copolymers had completely degraded after 21 day, and the starch graft polystyrene had partially degraded (45.8-93.1 % mass loss) after 27 days. The differences in the degree of biodegradation are the consequences of the different structures of the samples, and there was a significant negative correlation between the share of polystyrene in the copolymer and the degree of biodegradation. The grafting degree of PS necessary to prevent biodegradation was 54 %. Based on experimental evidence, the mechanisms of both biodegradation processes are proposed, and influence of degree of starch and synthetic component of copolymers on the degradation of the samples were established.
AB  - U ovom radu proučavana je biodegradacija kalemljenih kopolimera kukuruznog skroba i polistirena i kukuruznog skroba i poli(metakrilne kiseline) u rečnoj vodi. Ovi kopolimeri su sintetisani u prisustvu različitih aminoaktivatora. Sintetisani kopolimeri i produkta biodegradacije su karakterisani FTIR spektroskopijom i SEM mikroskopijom. Biodegradacija je praćena gubitkom mase uzoraka, a broj mikroorganizama Kohovom metodom. Stepen biodegradacije obe vrste kopolimera raste sa vremenom. Kalemljeni polimeri skroba i poli(metakrilne kiseline) potpuno se razgrađuju za 21 dan, dok se polimeri na bazi skroba i polistirena delimično razgrađuju nakon 27 dana (45,8-93,1 % od ukupne mase). Razlike u stepenu biodegradacije su posledica različite strukture uzoraka, a postoji i značajna negativna korelacija između udela polistirena u kopolimeru i stepena biodegradacije. Stepen kalemljenja polistirena (udeo polistirena u kopolimeru) koji sprečava biodegradaciju iznosio je 54 %. Na osnovu eksperimentalnih dokaza, predloženi su mehanizmi oba biodegradaciona procesa i ustanovljeni su uticaji količine skroba i sintetske komponente kopolimera na biodegradaciju.
PB  - Serbian Chemical Soc, Belgrade
T2  - Journal of the Serbian Chemical Society
T1  - Biodegradation of starch-graft-polystyrene and starch-graft-poly(methacrylic acid) copolymers in model river water
T1  - Biodegradacija kalemljenih kopolimera skroba i polistirena i skroba i poli(metakrilne kiseline) u rečnoj vodi
EP  - 1441
IS  - 9
SP  - 1425
VL  - 78
DO  - 10.2298/JSC121216051N
ER  - 

@article{
author = "Nikolić, Vladimir and Veličković, Sava and Antonović, Dušan G. and Popović, Aleksandar R.",
year = "2013",
abstract = "In this paper, a biodegradation study of grafted copolymers of cornstarch and polystyrene (PS) and cornstarch and poly(methacrylic acid) in model river water is described. These copolymers were obtained in the presence of different amine activators. The synthesized copolymers and products of degradation were characterized by Fourier transform infrared (FTIR) spectroscopy and scanning electron microscopy (SEM). Biodegradation was monitored by mass decrease and the number of microorganisms by the Koch method. Biodegradation of both copolymers advanced with time, the starch-graft-poly(methacrylic acid) copolymers had completely degraded after 21 day, and the starch graft polystyrene had partially degraded (45.8-93.1 % mass loss) after 27 days. The differences in the degree of biodegradation are the consequences of the different structures of the samples, and there was a significant negative correlation between the share of polystyrene in the copolymer and the degree of biodegradation. The grafting degree of PS necessary to prevent biodegradation was 54 %. Based on experimental evidence, the mechanisms of both biodegradation processes are proposed, and influence of degree of starch and synthetic component of copolymers on the degradation of the samples were established., U ovom radu proučavana je biodegradacija kalemljenih kopolimera kukuruznog skroba i polistirena i kukuruznog skroba i poli(metakrilne kiseline) u rečnoj vodi. Ovi kopolimeri su sintetisani u prisustvu različitih aminoaktivatora. Sintetisani kopolimeri i produkta biodegradacije su karakterisani FTIR spektroskopijom i SEM mikroskopijom. Biodegradacija je praćena gubitkom mase uzoraka, a broj mikroorganizama Kohovom metodom. Stepen biodegradacije obe vrste kopolimera raste sa vremenom. Kalemljeni polimeri skroba i poli(metakrilne kiseline) potpuno se razgrađuju za 21 dan, dok se polimeri na bazi skroba i polistirena delimično razgrađuju nakon 27 dana (45,8-93,1 % od ukupne mase). Razlike u stepenu biodegradacije su posledica različite strukture uzoraka, a postoji i značajna negativna korelacija između udela polistirena u kopolimeru i stepena biodegradacije. Stepen kalemljenja polistirena (udeo polistirena u kopolimeru) koji sprečava biodegradaciju iznosio je 54 %. Na osnovu eksperimentalnih dokaza, predloženi su mehanizmi oba biodegradaciona procesa i ustanovljeni su uticaji količine skroba i sintetske komponente kopolimera na biodegradaciju.",
publisher = "Serbian Chemical Soc, Belgrade",
journal = "Journal of the Serbian Chemical Society",
title = "Biodegradation of starch-graft-polystyrene and starch-graft-poly(methacrylic acid) copolymers in model river water, Biodegradacija kalemljenih kopolimera skroba i polistirena i skroba i poli(metakrilne kiseline) u rečnoj vodi",
pages = "1441-1425",
number = "9",
volume = "78",
doi = "10.2298/JSC121216051N"
}

Nikolić, V., Veličković, S., Antonović, D. G.,& Popović, A. R.. (2013). Biodegradation of starch-graft-polystyrene and starch-graft-poly(methacrylic acid) copolymers in model river water. in Journal of the Serbian Chemical Society
Serbian Chemical Soc, Belgrade., 78(9), 1425-1441.
https://doi.org/10.2298/JSC121216051N

Nikolić V, Veličković S, Antonović DG, Popović AR. Biodegradation of starch-graft-polystyrene and starch-graft-poly(methacrylic acid) copolymers in model river water. in Journal of the Serbian Chemical Society. 2013;78(9):1425-1441.
doi:10.2298/JSC121216051N .

Nikolić, Vladimir, Veličković, Sava, Antonović, Dušan G., Popović, Aleksandar R., "Biodegradation of starch-graft-polystyrene and starch-graft-poly(methacrylic acid) copolymers in model river water" in Journal of the Serbian Chemical Society, 78, no. 9 (2013):1425-1441,
https://doi.org/10.2298/JSC121216051N . .

TY  - JOUR
AU  - Nikolić, Vladimir
AU  - Veličković, Sava
AU  - Popović, Aleksandar R.
PY  - 2012
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/5665
AB  - The aim of this work was synthesis of grafted copolymers of poly(methacrylic acid) and starch (PMAA-graft-starch) with high percentage of grafting, G (%). The effect of temperature (55-75 degrees C), concentration of methacrylic acid monomer (0.775-1.452 mol/dm(3)), amount of initiator potassium persulfate (PPS) (0.00075-0.0025 mol), reaction time (30-270 min) and nature and amount (0.001-0.005 mol) of amine activator on percentage of grafting were investigated. The following amine activators were used: N,N-dimethylaminoethanol. N,N-diethylaminoethanol, triethylamine, propylamine, iso-butylamine, pentylamine, hexylamine, 4-(2-hidroxyethyl) morpholine and 1-(2-hidroxyethyl) piperazine. The graft copolymer was characterized by Fourier Transform Infrared Spectroscopy and Scanning Electron Microscopy. The highest G was 40.92%. Reaction conditions were as follows: 10.00 g of starch, monomer concentration was 0.775 mol/dm(3), temperature of 70 degrees C, the amount of PPS was 0.001 mol. The 4-(2-hidroxyethyl) morpholine was used as amine activator in amount of 0.001 mol. (C) 2012 Elsevier Ltd. All rights reserved.
PB  - Elsevier Sci Ltd, Oxford
T2  - Carbohydrate Polymers
T1  - Amine activators influence on grafting reaction between methacrylic acid and starch
EP  - 1413
IS  - 4
SP  - 1407
VL  - 88
DO  - 10.1016/j.carbpol.2012.02.027
ER  - 

@article{
author = "Nikolić, Vladimir and Veličković, Sava and Popović, Aleksandar R.",
year = "2012",
abstract = "The aim of this work was synthesis of grafted copolymers of poly(methacrylic acid) and starch (PMAA-graft-starch) with high percentage of grafting, G (%). The effect of temperature (55-75 degrees C), concentration of methacrylic acid monomer (0.775-1.452 mol/dm(3)), amount of initiator potassium persulfate (PPS) (0.00075-0.0025 mol), reaction time (30-270 min) and nature and amount (0.001-0.005 mol) of amine activator on percentage of grafting were investigated. The following amine activators were used: N,N-dimethylaminoethanol. N,N-diethylaminoethanol, triethylamine, propylamine, iso-butylamine, pentylamine, hexylamine, 4-(2-hidroxyethyl) morpholine and 1-(2-hidroxyethyl) piperazine. The graft copolymer was characterized by Fourier Transform Infrared Spectroscopy and Scanning Electron Microscopy. The highest G was 40.92%. Reaction conditions were as follows: 10.00 g of starch, monomer concentration was 0.775 mol/dm(3), temperature of 70 degrees C, the amount of PPS was 0.001 mol. The 4-(2-hidroxyethyl) morpholine was used as amine activator in amount of 0.001 mol. (C) 2012 Elsevier Ltd. All rights reserved.",
publisher = "Elsevier Sci Ltd, Oxford",
journal = "Carbohydrate Polymers",
title = "Amine activators influence on grafting reaction between methacrylic acid and starch",
pages = "1413-1407",
number = "4",
volume = "88",
doi = "10.1016/j.carbpol.2012.02.027"
}

Nikolić, V., Veličković, S.,& Popović, A. R.. (2012). Amine activators influence on grafting reaction between methacrylic acid and starch. in Carbohydrate Polymers
Elsevier Sci Ltd, Oxford., 88(4), 1407-1413.
https://doi.org/10.1016/j.carbpol.2012.02.027

Nikolić V, Veličković S, Popović AR. Amine activators influence on grafting reaction between methacrylic acid and starch. in Carbohydrate Polymers. 2012;88(4):1407-1413.
doi:10.1016/j.carbpol.2012.02.027 .

Nikolić, Vladimir, Veličković, Sava, Popović, Aleksandar R., "Amine activators influence on grafting reaction between methacrylic acid and starch" in Carbohydrate Polymers, 88, no. 4 (2012):1407-1413,
https://doi.org/10.1016/j.carbpol.2012.02.027 . .

TY  - JOUR
AU  - Sremac, Snežana
AU  - Popović, Aleksandar R.
AU  - Todorović, Žaklina
AU  - Čokeša, Đuro
AU  - Onjia, Antonije
PY  - 2008
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/1347
AB  - An interpretative strategy (factorial design experimentation + total resolution analysis + chromatogram simulation) was employed to optimize the separation of 16 polycyclic aromatic hydrocarbons (PAHs) (naphthalene, acenaphthylene, acenaphthene, fluorene, phenanthrene, anthracene, fluoranthene, pyrene, chrysene, benzo(a)anthracene, benzo(k)fluoranthene, benzo(b)fluoranthene, benzo(a)pyrene, indeno(1,2,3-c,d)pyrene, dibenzo(a,h)anthracene, benzo(g,h,i)perylene) in temperature-programmed gas chromatography (GC). Also, the retention behavior of PAHs in the same GC system was studied by a feed-forward artificial neural network (ANN). GC separation was investigated as a function of one (linear temperature ramp) or two (linear temperature ramp+the final hold temperature) variables. The applied interpretative approach resulted in rather good agreement between the measured and the predicted retention times for PAHs in both one and two variable modeling. The ANN model, strongly affected by the number of input experiments, was shown to be less effective for one variable used, but quite successful when two input variables were used. All PAHs, including difficult to separate peak pairs (benzo(k)fluoranthene/benzo(b)fluoranthene and indeno(1,2,3-c,d)pyrene/dibenzo(a,h)anthracene), were separated in a standard (5% phenyl-95% climethylpolysiloxane) capillary column at an optimum temperature ramp of 8.0 degrees C/min and final hold temperature in the range of 260-320 degrees C.
PB  - Elsevier, Amsterdam
T2  - Talanta
T1  - Interpretative optimization and artificial neural network modeling of the gas chromatographic separation of polycyclic aromatic hydrocarbons
EP  - 71
IS  - 1
SP  - 66
VL  - 76
DO  - 10.1016/j.talanta.2008.02.004
ER  - 

@article{
author = "Sremac, Snežana and Popović, Aleksandar R. and Todorović, Žaklina and Čokeša, Đuro and Onjia, Antonije",
year = "2008",
abstract = "An interpretative strategy (factorial design experimentation + total resolution analysis + chromatogram simulation) was employed to optimize the separation of 16 polycyclic aromatic hydrocarbons (PAHs) (naphthalene, acenaphthylene, acenaphthene, fluorene, phenanthrene, anthracene, fluoranthene, pyrene, chrysene, benzo(a)anthracene, benzo(k)fluoranthene, benzo(b)fluoranthene, benzo(a)pyrene, indeno(1,2,3-c,d)pyrene, dibenzo(a,h)anthracene, benzo(g,h,i)perylene) in temperature-programmed gas chromatography (GC). Also, the retention behavior of PAHs in the same GC system was studied by a feed-forward artificial neural network (ANN). GC separation was investigated as a function of one (linear temperature ramp) or two (linear temperature ramp+the final hold temperature) variables. The applied interpretative approach resulted in rather good agreement between the measured and the predicted retention times for PAHs in both one and two variable modeling. The ANN model, strongly affected by the number of input experiments, was shown to be less effective for one variable used, but quite successful when two input variables were used. All PAHs, including difficult to separate peak pairs (benzo(k)fluoranthene/benzo(b)fluoranthene and indeno(1,2,3-c,d)pyrene/dibenzo(a,h)anthracene), were separated in a standard (5% phenyl-95% climethylpolysiloxane) capillary column at an optimum temperature ramp of 8.0 degrees C/min and final hold temperature in the range of 260-320 degrees C.",
publisher = "Elsevier, Amsterdam",
journal = "Talanta",
title = "Interpretative optimization and artificial neural network modeling of the gas chromatographic separation of polycyclic aromatic hydrocarbons",
pages = "71-66",
number = "1",
volume = "76",
doi = "10.1016/j.talanta.2008.02.004"
}

Sremac, S., Popović, A. R., Todorović, Ž., Čokeša, Đ.,& Onjia, A.. (2008). Interpretative optimization and artificial neural network modeling of the gas chromatographic separation of polycyclic aromatic hydrocarbons. in Talanta
Elsevier, Amsterdam., 76(1), 66-71.
https://doi.org/10.1016/j.talanta.2008.02.004

Sremac S, Popović AR, Todorović Ž, Čokeša Đ, Onjia A. Interpretative optimization and artificial neural network modeling of the gas chromatographic separation of polycyclic aromatic hydrocarbons. in Talanta. 2008;76(1):66-71.
doi:10.1016/j.talanta.2008.02.004 .

Sremac, Snežana, Popović, Aleksandar R., Todorović, Žaklina, Čokeša, Đuro, Onjia, Antonije, "Interpretative optimization and artificial neural network modeling of the gas chromatographic separation of polycyclic aromatic hydrocarbons" in Talanta, 76, no. 1 (2008):66-71,
https://doi.org/10.1016/j.talanta.2008.02.004 . .

TY  - JOUR
AU  - Ražić, Slavica
AU  - Onjia, Antonije
AU  - Dogo, S
AU  - Slavković, Latinka J.
AU  - Popović, Aleksandar R.
PY  - 2005
UR  - http://TechnoRep.tmf.bg.ac.rs/handle/123456789/813
AB  - The concentrations of Cu, Zn, Mn, Fe, K, Ca, Mg, Al, Ba and B in 26 herbal drugs of special importance in phytopharmacywere studied. Flame atomic absorption and emission spectrometry (FAAS, FAES), as well as inductively coupled plasma atomic emission spectrometry (ICP-AES), were applied in this work. The whole procedure, from sample preparation, via dissolution, to measurements, was validated by using CRM (NIST 1573a-tomato leaves), and the obtained recovery values are in the range from 91 to 102%. Drug samples originated from medicinal plants cultivated in Serbia contained Cu (4.47-14.08 mg kg(-1)), Zn (8.4-54.5 mg kg(-1)), Mn (9-155 mg kg(-1)), Fe (47-546 mg kg(-1)), K (0.20-6.24%), Ca (0.18-1.84%), Mg (0.13-1.09%), Al (16-416 mg kg(-1)), Ba (11.70-84.83 mg kg(-1)) and B (5.1-118.7 mg kg(-1)). In order to get a better insight into the elemental patterns, a common chemometric approach to data evaluation was used. Four significant factors identified by principal component analysis (PCA) were attributed partly to the significant influential sources and high mobility of some elements thus referring to potential anthropogenic contamination as well.
PB  - Elsevier, Amsterdam
T2  - Talanta
T1  - Determination of metal content in some herbal drugs - Empirical and chemometric approach
EP  - 239
IS  - 1
SP  - 233
VL  - 67
DO  - 10.1016/j.talanta.2005.03.023
ER  - 

@article{
author = "Ražić, Slavica and Onjia, Antonije and Dogo, S and Slavković, Latinka J. and Popović, Aleksandar R.",
year = "2005",
abstract = "The concentrations of Cu, Zn, Mn, Fe, K, Ca, Mg, Al, Ba and B in 26 herbal drugs of special importance in phytopharmacywere studied. Flame atomic absorption and emission spectrometry (FAAS, FAES), as well as inductively coupled plasma atomic emission spectrometry (ICP-AES), were applied in this work. The whole procedure, from sample preparation, via dissolution, to measurements, was validated by using CRM (NIST 1573a-tomato leaves), and the obtained recovery values are in the range from 91 to 102%. Drug samples originated from medicinal plants cultivated in Serbia contained Cu (4.47-14.08 mg kg(-1)), Zn (8.4-54.5 mg kg(-1)), Mn (9-155 mg kg(-1)), Fe (47-546 mg kg(-1)), K (0.20-6.24%), Ca (0.18-1.84%), Mg (0.13-1.09%), Al (16-416 mg kg(-1)), Ba (11.70-84.83 mg kg(-1)) and B (5.1-118.7 mg kg(-1)). In order to get a better insight into the elemental patterns, a common chemometric approach to data evaluation was used. Four significant factors identified by principal component analysis (PCA) were attributed partly to the significant influential sources and high mobility of some elements thus referring to potential anthropogenic contamination as well.",
publisher = "Elsevier, Amsterdam",
journal = "Talanta",
title = "Determination of metal content in some herbal drugs - Empirical and chemometric approach",
pages = "239-233",
number = "1",
volume = "67",
doi = "10.1016/j.talanta.2005.03.023"
}

Ražić, S., Onjia, A., Dogo, S., Slavković, L. J.,& Popović, A. R.. (2005). Determination of metal content in some herbal drugs - Empirical and chemometric approach. in Talanta
Elsevier, Amsterdam., 67(1), 233-239.
https://doi.org/10.1016/j.talanta.2005.03.023

Ražić S, Onjia A, Dogo S, Slavković LJ, Popović AR. Determination of metal content in some herbal drugs - Empirical and chemometric approach. in Talanta. 2005;67(1):233-239.
doi:10.1016/j.talanta.2005.03.023 .

Ražić, Slavica, Onjia, Antonije, Dogo, S, Slavković, Latinka J., Popović, Aleksandar R., "Determination of metal content in some herbal drugs - Empirical and chemometric approach" in Talanta, 67, no. 1 (2005):233-239,
https://doi.org/10.1016/j.talanta.2005.03.023 . .