TY  - CONF
AU  - Čokeša, Đuro
AU  - Marković, Mirjana
AU  - Potkonjak, Nebojša
AU  - Kaluđerović, Branka
AU  - Radmanović, Svjetlana
AU  - Šerbula, Snežana
PY  - 2023
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/12847
AB  - Arsenite–humic acid-binding process was investigated using the Isothermal Titration Calorimetry(ITC). The ITC data were successfully (R2=0.996-0.936) interpreted by applying the MNIS model,enabling thermodynamic parameters to be determined. The MNIS model was adjusted to the arsenite–HA binding process assuming hydrogen bonding as the dominant type of interaction in the system.Negative enthalpy change values indicated the arsenite–HAs binding as an exothermic process.Negative ΔG values (-(27.85-26.83) kJ mol-1) pointed out to spontaneous binding reaction, leading tothe formation of the arsenite–HA complexes. High binding constants values ((7.57-5.02)105 M-1)clearly demonstrated pronounced binding affinity. As ΔS values (0.041-0.027) kJ mol-1 K-1) wereapparently positive, but close to zero, and ΔH>ΔS, the reaction could be considered enthalpy driven.Reaction heats and H values (-(18.96-15.64) kJ mol-1) confirmed hydrogen bonds as the mostascendant interaction type in the arsenite–HA complex. Thermodynamic and reaction parametersclearly indicated that arsenite–HA complexes are formed at common soil pH values, confirming thepossible influence of humic acids on increased As mobility, and its reduced bioavailability.
PB  - Bor : University of Belgrade, Technical Faculty in Bor
C3  - EcoTER’22 : 29th International Conference Ecological Truth and Environmental Research : Proceedings
T1  - Arsenite–soil humic acid binding by isothermal titration calorimetry: Thermodynamics and MNIS model
SP  - 121
EP  - 126
UR  - https://hdl.handle.net/21.15107/rcub_vinar_12847
ER  - 

@conference{
author = "Čokeša, Đuro and Marković, Mirjana and Potkonjak, Nebojša and Kaluđerović, Branka and Radmanović, Svjetlana and Šerbula, Snežana",
year = "2023",
abstract = "Arsenite–humic acid-binding process was investigated using the Isothermal Titration Calorimetry(ITC). The ITC data were successfully (R2=0.996-0.936) interpreted by applying the MNIS model,enabling thermodynamic parameters to be determined. The MNIS model was adjusted to the arsenite–HA binding process assuming hydrogen bonding as the dominant type of interaction in the system.Negative enthalpy change values indicated the arsenite–HAs binding as an exothermic process.Negative ΔG values (-(27.85-26.83) kJ mol-1) pointed out to spontaneous binding reaction, leading tothe formation of the arsenite–HA complexes. High binding constants values ((7.57-5.02)105 M-1)clearly demonstrated pronounced binding affinity. As ΔS values (0.041-0.027) kJ mol-1 K-1) wereapparently positive, but close to zero, and ΔH>ΔS, the reaction could be considered enthalpy driven.Reaction heats and H values (-(18.96-15.64) kJ mol-1) confirmed hydrogen bonds as the mostascendant interaction type in the arsenite–HA complex. Thermodynamic and reaction parametersclearly indicated that arsenite–HA complexes are formed at common soil pH values, confirming thepossible influence of humic acids on increased As mobility, and its reduced bioavailability.",
publisher = "Bor : University of Belgrade, Technical Faculty in Bor",
journal = "EcoTER’22 : 29th International Conference Ecological Truth and Environmental Research : Proceedings",
title = "Arsenite–soil humic acid binding by isothermal titration calorimetry: Thermodynamics and MNIS model",
pages = "121-126",
url = "https://hdl.handle.net/21.15107/rcub_vinar_12847"
}

Čokeša, Đ., Marković, M., Potkonjak, N., Kaluđerović, B., Radmanović, S.,& Šerbula, S.. (2023). Arsenite–soil humic acid binding by isothermal titration calorimetry: Thermodynamics and MNIS model. in EcoTER’22 : 29th International Conference Ecological Truth and Environmental Research : Proceedings
Bor : University of Belgrade, Technical Faculty in Bor., 121-126.
https://hdl.handle.net/21.15107/rcub_vinar_12847

Čokeša Đ, Marković M, Potkonjak N, Kaluđerović B, Radmanović S, Šerbula S. Arsenite–soil humic acid binding by isothermal titration calorimetry: Thermodynamics and MNIS model. in EcoTER’22 : 29th International Conference Ecological Truth and Environmental Research : Proceedings. 2023;:121-126.
https://hdl.handle.net/21.15107/rcub_vinar_12847 .

Čokeša, Đuro, Marković, Mirjana, Potkonjak, Nebojša, Kaluđerović, Branka, Radmanović, Svjetlana, Šerbula, Snežana, "Arsenite–soil humic acid binding by isothermal titration calorimetry: Thermodynamics and MNIS model" in EcoTER’22 : 29th International Conference Ecological Truth and Environmental Research : Proceedings (2023):121-126,
https://hdl.handle.net/21.15107/rcub_vinar_12847 .

TY  - JOUR
AU  - Jovanović, Uroš D.
AU  - Marković, Mirjana
AU  - Čokeša, Đuro
AU  - Živković, Nikola V.
AU  - Radmanović, Svjetlana B.
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/10351
AB  - The main goal of this work was to estimate the influence of carboxyl and phenolic groups, as well as aromatic, aliphatic and polysaccharide components, on the soil humic acids (HA) self-aggregation process. Soil HAs (leptosol and regosol) were separated using base resin getting fractions with different functional group contents. Blocking of carboxyl groups was performed using the esterification procedure to estimate the participation of each functional group in the HA aggregation. The presence of HA structural components was evaluated by potentiometric titration and ATR-FTIR. The aggregation was monitored at pH 3 using dynamic light scattering. Results indicated that the higher group content, the HA aggregation is less pronounced. A significant positive correlation of aliphatic C and aggregate size revealed their dominant influence in the HA self-aggregation. A lower abundance of aliphatic C in HA fractions could be considered as not sufficient to start the process. An increase of aromatic C in esters likely pointed out to its participation in hydrophobic bonding and, consequently, more pronounced aggregation. The relation of HA self-aggregate size with carboxyl and phenolic group, as well as aliphatic C, at low pH, could be considered universal regardless of the structural characteristics of the original or modified HA forms.
T2  - Journal of the Serbian Chemical Society
T1  - Self-aggregation of soil humic acids with respect to their structural characteristics
VL  - 87
IS  - 6
SP  - 761
EP  - 773
DO  - 10.2298/JSC211125010J
ER  - 

@article{
author = "Jovanović, Uroš D. and Marković, Mirjana and Čokeša, Đuro and Živković, Nikola V. and Radmanović, Svjetlana B.",
year = "2022",
abstract = "The main goal of this work was to estimate the influence of carboxyl and phenolic groups, as well as aromatic, aliphatic and polysaccharide components, on the soil humic acids (HA) self-aggregation process. Soil HAs (leptosol and regosol) were separated using base resin getting fractions with different functional group contents. Blocking of carboxyl groups was performed using the esterification procedure to estimate the participation of each functional group in the HA aggregation. The presence of HA structural components was evaluated by potentiometric titration and ATR-FTIR. The aggregation was monitored at pH 3 using dynamic light scattering. Results indicated that the higher group content, the HA aggregation is less pronounced. A significant positive correlation of aliphatic C and aggregate size revealed their dominant influence in the HA self-aggregation. A lower abundance of aliphatic C in HA fractions could be considered as not sufficient to start the process. An increase of aromatic C in esters likely pointed out to its participation in hydrophobic bonding and, consequently, more pronounced aggregation. The relation of HA self-aggregate size with carboxyl and phenolic group, as well as aliphatic C, at low pH, could be considered universal regardless of the structural characteristics of the original or modified HA forms.",
journal = "Journal of the Serbian Chemical Society",
title = "Self-aggregation of soil humic acids with respect to their structural characteristics",
volume = "87",
number = "6",
pages = "761-773",
doi = "10.2298/JSC211125010J"
}

Jovanović, U. D., Marković, M., Čokeša, Đ., Živković, N. V.,& Radmanović, S. B.. (2022). Self-aggregation of soil humic acids with respect to their structural characteristics. in Journal of the Serbian Chemical Society, 87(6), 761-773.
https://doi.org/10.2298/JSC211125010J

Jovanović UD, Marković M, Čokeša Đ, Živković NV, Radmanović SB. Self-aggregation of soil humic acids with respect to their structural characteristics. in Journal of the Serbian Chemical Society. 2022;87(6):761-773.
doi:10.2298/JSC211125010J .

Jovanović, Uroš D., Marković, Mirjana, Čokeša, Đuro, Živković, Nikola V., Radmanović, Svjetlana B., "Self-aggregation of soil humic acids with respect to their structural characteristics" in Journal of the Serbian Chemical Society, 87, no. 6 (2022):761-773,
https://doi.org/10.2298/JSC211125010J . .

TY  - CONF
AU  - Radenković, Mirjana
AU  - Božić, Gavrilo
AU  - Krneta-Nikolić, Jelena D.
AU  - Topalović, Dušan
AU  - Radmanović, Svjetlana
PY  - 2022
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/11108
AB  - Mountain ecosystems are going through changes due to numerous physical-chemical processes in the environment rather than the anthropogenic activities. Primordial radioactivity of rock and soil material migrates and fractionates in other environmental sections like waters, air and biota. Having a feature to accumulate different minerals and trace element present in soil and three substrates, fungi indicates their composition and related processes. The aim of this study is uptake of radionuclides by fungi in the schist soil of the Stara Planina, mountain famous for biodiversity as well as for enhanced natural radioactivity areas. Samples of various fungi species (stipes and cups) and their soil substrates have been collected in summer season 2019. Collected soil samples are pedologically characterized and analysed by gamma-spectrometry (HP Ge) after the secular radioactive equilibrium had been reached. Soil characterization has shown the share of coarse fragments, sand, silt and clay in the schist (shale) structure while pH value was 4.80-5.33 and organic carbon content 3.10%. The content of significant natural radionuclides 40K, 226Ra, 232Th, 238U and manmade 137Cs was (in Bq/kg) was 500±30, 27±2, 26±2, 32±4, 1.6±0.2 respectively. Dried fungi samples were analysed by gamma spectrometry showing the natural radionuclide content in wide range of values. Obtained results indicate dependence of the radionuclides uptake from the substrate on their abundance in schist soil type as well as the fungus specie physiology. Slight difference was observed in results between content in species with different types of nutrient uptake (mycorrhizal and saprobic). The 137Cs content varied from 2-20 Bq/kg. Further knowledge on the local population habits in use of edible fungi species would enable dose assessment for the representatives of the public and contribute to a further research on the Stara Planina mountain ecosystem.
PB  - RAD Centre, Niš, Serbia
C3  - RAD 2022 : 10th Jubilee International Conference on Radiation in Various Fields of Research : book of abstracts; July 25-29; Herceg Novi, Montenegro
T1  - Radioactivity of fungi in schist-type soil
in the Stara Planina mountain ecosystem
SP  - 116
DO  - 10.21175/rad.sum.abstr.book.2022.27.7
ER  - 

@conference{
author = "Radenković, Mirjana and Božić, Gavrilo and Krneta-Nikolić, Jelena D. and Topalović, Dušan and Radmanović, Svjetlana",
year = "2022",
abstract = "Mountain ecosystems are going through changes due to numerous physical-chemical processes in the environment rather than the anthropogenic activities. Primordial radioactivity of rock and soil material migrates and fractionates in other environmental sections like waters, air and biota. Having a feature to accumulate different minerals and trace element present in soil and three substrates, fungi indicates their composition and related processes. The aim of this study is uptake of radionuclides by fungi in the schist soil of the Stara Planina, mountain famous for biodiversity as well as for enhanced natural radioactivity areas. Samples of various fungi species (stipes and cups) and their soil substrates have been collected in summer season 2019. Collected soil samples are pedologically characterized and analysed by gamma-spectrometry (HP Ge) after the secular radioactive equilibrium had been reached. Soil characterization has shown the share of coarse fragments, sand, silt and clay in the schist (shale) structure while pH value was 4.80-5.33 and organic carbon content 3.10%. The content of significant natural radionuclides 40K, 226Ra, 232Th, 238U and manmade 137Cs was (in Bq/kg) was 500±30, 27±2, 26±2, 32±4, 1.6±0.2 respectively. Dried fungi samples were analysed by gamma spectrometry showing the natural radionuclide content in wide range of values. Obtained results indicate dependence of the radionuclides uptake from the substrate on their abundance in schist soil type as well as the fungus specie physiology. Slight difference was observed in results between content in species with different types of nutrient uptake (mycorrhizal and saprobic). The 137Cs content varied from 2-20 Bq/kg. Further knowledge on the local population habits in use of edible fungi species would enable dose assessment for the representatives of the public and contribute to a further research on the Stara Planina mountain ecosystem.",
publisher = "RAD Centre, Niš, Serbia",
journal = "RAD 2022 : 10th Jubilee International Conference on Radiation in Various Fields of Research : book of abstracts; July 25-29; Herceg Novi, Montenegro",
title = "Radioactivity of fungi in schist-type soil
in the Stara Planina mountain ecosystem",
pages = "116",
doi = "10.21175/rad.sum.abstr.book.2022.27.7"
}

Radenković, M., Božić, G., Krneta-Nikolić, J. D., Topalović, D.,& Radmanović, S.. (2022). Radioactivity of fungi in schist-type soil
in the Stara Planina mountain ecosystem. in RAD 2022 : 10th Jubilee International Conference on Radiation in Various Fields of Research : book of abstracts; July 25-29; Herceg Novi, Montenegro
RAD Centre, Niš, Serbia., 116.
https://doi.org/10.21175/rad.sum.abstr.book.2022.27.7

Radenković M, Božić G, Krneta-Nikolić JD, Topalović D, Radmanović S. Radioactivity of fungi in schist-type soil
in the Stara Planina mountain ecosystem. in RAD 2022 : 10th Jubilee International Conference on Radiation in Various Fields of Research : book of abstracts; July 25-29; Herceg Novi, Montenegro. 2022;:116.
doi:10.21175/rad.sum.abstr.book.2022.27.7 .

Radenković, Mirjana, Božić, Gavrilo, Krneta-Nikolić, Jelena D., Topalović, Dušan, Radmanović, Svjetlana, "Radioactivity of fungi in schist-type soil
in the Stara Planina mountain ecosystem" in RAD 2022 : 10th Jubilee International Conference on Radiation in Various Fields of Research : book of abstracts; July 25-29; Herceg Novi, Montenegro (2022):116,
https://doi.org/10.21175/rad.sum.abstr.book.2022.27.7 . .

TY  - JOUR
AU  - Radmanović, Svjetlana B.
AU  - Marković, Mirjana
AU  - Jovanović, Uroš D.
AU  - Gajić-Kvaščev, Maja
AU  - Čokeša, Đuro
AU  - Lilić, Jasmina
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9020
AB  - Part of Cu post flotation tailings of Serbia ZiJin Bor Copper, Serbia, was reclaimed by restoration of top soil with arable soils, and revegetation in 1991. Humic acids isolated from these Technosols were investigated to find out if their properties underwent any changes since reclamation. Two groups of control samples were used. Elemental composition (CHNS analysis) falls within the range of average soil humic acids. Humic acids belong to the type B pointing out to its lower humification degree (UV?Vis). Relative abundances of functional groups are ranged as follows: polysaccharide C ??aromatic C > carboxyl C > OH group > aliphatic C. Aromaticity indexes are low, 1.88? 3.25 (ATR-FTIR). Basic units at pH 10 are in the 11.7?26.8 nm range. Pronounced reaggregation (1462-?5218 nm) at pH 3 points out to less expressed humic acid sol stability, as well as to increase in aromatic condensation degree (dynamic light scattering). No significant changes have occurred in technosol humic acids since the recultivation, confirming stability of their properties over time (PCA). Nevertheless, humic acids from very strongly acidic Technosols show higher humifycation degree possibly originating from arable soils used in reclamation, but more likely from low soil pH and low litter input, results of unsuccessful reclamation.
T2  - Journal of the Serbian Chemical Society
T1  - Properties of humic acids from copper tailings 20 years after reclamation
VL  - 85
IS  - 3
SP  - 407
EP  - 419
DO  - 10.2298/JSC190717112R
ER  - 

@article{
author = "Radmanović, Svjetlana B. and Marković, Mirjana and Jovanović, Uroš D. and Gajić-Kvaščev, Maja and Čokeša, Đuro and Lilić, Jasmina",
year = "2020",
abstract = "Part of Cu post flotation tailings of Serbia ZiJin Bor Copper, Serbia, was reclaimed by restoration of top soil with arable soils, and revegetation in 1991. Humic acids isolated from these Technosols were investigated to find out if their properties underwent any changes since reclamation. Two groups of control samples were used. Elemental composition (CHNS analysis) falls within the range of average soil humic acids. Humic acids belong to the type B pointing out to its lower humification degree (UV?Vis). Relative abundances of functional groups are ranged as follows: polysaccharide C ??aromatic C > carboxyl C > OH group > aliphatic C. Aromaticity indexes are low, 1.88? 3.25 (ATR-FTIR). Basic units at pH 10 are in the 11.7?26.8 nm range. Pronounced reaggregation (1462-?5218 nm) at pH 3 points out to less expressed humic acid sol stability, as well as to increase in aromatic condensation degree (dynamic light scattering). No significant changes have occurred in technosol humic acids since the recultivation, confirming stability of their properties over time (PCA). Nevertheless, humic acids from very strongly acidic Technosols show higher humifycation degree possibly originating from arable soils used in reclamation, but more likely from low soil pH and low litter input, results of unsuccessful reclamation.",
journal = "Journal of the Serbian Chemical Society",
title = "Properties of humic acids from copper tailings 20 years after reclamation",
volume = "85",
number = "3",
pages = "407-419",
doi = "10.2298/JSC190717112R"
}

Radmanović, S. B., Marković, M., Jovanović, U. D., Gajić-Kvaščev, M., Čokeša, Đ.,& Lilić, J.. (2020). Properties of humic acids from copper tailings 20 years after reclamation. in Journal of the Serbian Chemical Society, 85(3), 407-419.
https://doi.org/10.2298/JSC190717112R

Radmanović SB, Marković M, Jovanović UD, Gajić-Kvaščev M, Čokeša Đ, Lilić J. Properties of humic acids from copper tailings 20 years after reclamation. in Journal of the Serbian Chemical Society. 2020;85(3):407-419.
doi:10.2298/JSC190717112R .

Radmanović, Svjetlana B., Marković, Mirjana, Jovanović, Uroš D., Gajić-Kvaščev, Maja, Čokeša, Đuro, Lilić, Jasmina, "Properties of humic acids from copper tailings 20 years after reclamation" in Journal of the Serbian Chemical Society, 85, no. 3 (2020):407-419,
https://doi.org/10.2298/JSC190717112R . .

TY  - JOUR
AU  - Radmanović, Svjetlana B.
AU  - Gajić-Kvaščev, Maja 
AU  - Mrvić, Vesna
AU  - Đorđević, Aleksandar
PY  - 2020
UR  - https://vinar.vin.bg.ac.rs/handle/123456789/9755
AB  - According to the Serbian official soil classification system, Rendzina is a soil type with an A-AC-C-R profile, developed on parent rock containing more than 20% of calcareous material (except soils with an A-R profile on hard pure limestone or dolomite). Previous investigations have shown that 29 Rendzina soil profiles from Serbia belong to the reference soil groups (RSGs) of Leptosols, Regosols and Phaeozems according to the World Reference Base for Soil Resources (WRB 2015). The present study addresses the correlations among three WRB RSGs in terms of soil texture, mean weight diameter (MWD), total N content, and humus fractional composition using Principal Component Analysis (PCA). The objective is to better understand the mutual relationship between the classification soil units used in Serbia and the international WRB system. The results show that PCA cannot unequivocally distinguish between these three RSGs. Leptosols and Regosols are highly incoherent groups while the group of Phaeozems is highly coherent, leading to the conclusion that the physical and chemical properties of the soil profiles of Phaoeozems are specific. It is obvious that soil depth and color, which are the overriding factors in the differentiation of Rendzina soils into three WRB RSGs, had no significant effect on these properties. The results further show that soil properties such as texture, MWD, humus fractional composition, etc. cannot be used to correlate Rendzina soils from Serbia with WRB. Instead, careful correlation of individual soil profiles is needed based on quantitative soil data analysis as required by WRB.
T2  - Journal of Agricultural Sciences (Belgrade)
T1  - Characteristics of Rendzina soils in Serbia and their WRB classification
VL  - 65
IS  - 3
SP  - 251
EP  - 261
DO  - 10.2298/JAS2003251R
ER  - 

@article{
author = "Radmanović, Svjetlana B. and Gajić-Kvaščev, Maja  and Mrvić, Vesna and Đorđević, Aleksandar",
year = "2020",
abstract = "According to the Serbian official soil classification system, Rendzina is a soil type with an A-AC-C-R profile, developed on parent rock containing more than 20% of calcareous material (except soils with an A-R profile on hard pure limestone or dolomite). Previous investigations have shown that 29 Rendzina soil profiles from Serbia belong to the reference soil groups (RSGs) of Leptosols, Regosols and Phaeozems according to the World Reference Base for Soil Resources (WRB 2015). The present study addresses the correlations among three WRB RSGs in terms of soil texture, mean weight diameter (MWD), total N content, and humus fractional composition using Principal Component Analysis (PCA). The objective is to better understand the mutual relationship between the classification soil units used in Serbia and the international WRB system. The results show that PCA cannot unequivocally distinguish between these three RSGs. Leptosols and Regosols are highly incoherent groups while the group of Phaeozems is highly coherent, leading to the conclusion that the physical and chemical properties of the soil profiles of Phaoeozems are specific. It is obvious that soil depth and color, which are the overriding factors in the differentiation of Rendzina soils into three WRB RSGs, had no significant effect on these properties. The results further show that soil properties such as texture, MWD, humus fractional composition, etc. cannot be used to correlate Rendzina soils from Serbia with WRB. Instead, careful correlation of individual soil profiles is needed based on quantitative soil data analysis as required by WRB.",
journal = "Journal of Agricultural Sciences (Belgrade)",
title = "Characteristics of Rendzina soils in Serbia and their WRB classification",
volume = "65",
number = "3",
pages = "251-261",
doi = "10.2298/JAS2003251R"
}

Radmanović, S. B., Gajić-Kvaščev, M., Mrvić, V.,& Đorđević, A.. (2020). Characteristics of Rendzina soils in Serbia and their WRB classification. in Journal of Agricultural Sciences (Belgrade), 65(3), 251-261.
https://doi.org/10.2298/JAS2003251R

Radmanović SB, Gajić-Kvaščev M, Mrvić V, Đorđević A. Characteristics of Rendzina soils in Serbia and their WRB classification. in Journal of Agricultural Sciences (Belgrade). 2020;65(3):251-261.
doi:10.2298/JAS2003251R .

Radmanović, Svjetlana B., Gajić-Kvaščev, Maja , Mrvić, Vesna, Đorđević, Aleksandar, "Characteristics of Rendzina soils in Serbia and their WRB classification" in Journal of Agricultural Sciences (Belgrade), 65, no. 3 (2020):251-261,
https://doi.org/10.2298/JAS2003251R . .