TY  - JOUR
AU  - Jovanović, Uroš D.
AU  - Marković, Mirjana M.
AU  - Čokeša, Đuro M.
AU  - Živković, Nikola V.
AU  - Radmanović, Svjetlana B.
PY  - 2022
UR  - http://www.doiserbia.nb.rs/Article.aspx?ID=0352-51392200010J
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/6139
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
T2  - Journal of the Serbian Chemical Society
T1  - Self-aggregation of soil humic acids with respect to their structural characteristics
EP  - 773
IS  - 6
SP  - 761
VL  - 87
UR  - https://hdl.handle.net/21.15107/rcub_agrospace_6139
ER  - 

@article{
author = "Jovanović, Uroš D. and Marković, Mirjana M. and Čokeša, Đuro M. 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, Journal of the Serbian Chemical Society",
title = "Self-aggregation of soil humic acids with respect to their structural characteristics",
pages = "773-761",
number = "6",
volume = "87",
url = "https://hdl.handle.net/21.15107/rcub_agrospace_6139"
}

Jovanović, U. D., Marković, M. M., Čokeša, Đ. M., 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://hdl.handle.net/21.15107/rcub_agrospace_6139

Jovanović UD, Marković MM, Čokeša ĐM, 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.
https://hdl.handle.net/21.15107/rcub_agrospace_6139 .

Jovanović, Uroš D., Marković, Mirjana M., Čokeša, Đuro M., 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://hdl.handle.net/21.15107/rcub_agrospace_6139 .

TY  - CONF
AU  - Radmanović, Svjetlana
AU  - Marković, Mirjana
AU  - Živković, Nikola
AU  - Čokeša, Đuro
AU  - Jovanović, Uroš
AU  - Bogosavljević, Jelena
PY  - 2021
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/6650
AB  - Humic substances, including humic acids (HAs), are the most abundant fractions of soil organic matter. Their composition, structure and properties, determined by soil formation conditions, can be used as indicators of pedogenetic processes. In this study, elemental composition as very important part of HAs characterization was determined for humic acids isolated from the soils of Serbia developed under different pedogenetic conditions (Chernozem (CH), Smonica/Vertisol (VR), Rendzina/Regosol (RG), Pseudoglej/Planosol (PL) and Prelazni treset/Histosol (HI) and related to soil properties and origin. Soil samples were collected at 0 to 15-30 cm depth. Soil texture, organic C (soil organic matter for HI), and pH were determined by common methods. HA samples were isolated using a modified IHSS method. The C, H, and N contents of HA samples were determined using elemental analyzer (CHNS 628, LECO Corporation, USA) after drying the samples over P2O5 under vacuum. Their percentages were calculated on the ash-free basis. The oxygen content was obtained as the difference. The ash content was determined by a dry combustion method. The C/N, O/C, H/C and O/H atomic ratios were used as indicators of variations in HA properties as a function of HA origin. Internal oxidation degree (ω) was calculated by the equation: ω = (2O+3N-H)/C, where: O, N, H and C are element contents (atomic %). Elemental compositions of investigated HAs fall within the range of average values reported for soil HAs. According to the humification degree obtained, HAs studied are ranged as follows: CH>VR>RG>HI>PL. Both correlations done (H/C versus O/C and H versus C) separate HAs in three groups: CH and VR - the most dehydrogenated and demethylated, i.e. the most stable; RG - the most oxidated; and HI and PL - the most hydrogenated. HAs elemental composition is related to soil organic C and pH, but not related to soil clay. Internal oxidation degree is used as an indicator of plant residue humification progress. Positive ω values point out well drained soils with prevailing oxidizing conditions and negative values reflect anaerobic soil conditions. Internal oxidation degree values are obviously lower in hydromorphic HI and PL HAs compared to terrestrial RG, CH and VR HAs, but positive values indicate predominance of aerobic under anaerobic conditions in surface layer of hydromorphic soils. Results obtained in this study are in agreement with the literature data, indicating characteristics of HAs as particularly dependant on environmental conditions.
PB  - Serbian Society of Soil Science
C3  - 3rd International and 15th National Congress of Serbian Society of Soil Science: Soils for Future under Global Challenges, Sokobanja, Serbia
T1  - ELEMENTAL COMPOSITION OF HUMIC ACIDS ISOLATED FROM CHERNOZEM, VERTISOL, REGOSOL, PLANOSOL AND HISTOSOL
EP  - 70
SP  - 64
UR  - https://hdl.handle.net/21.15107/rcub_agrospace_6650
ER  - 

@conference{
author = "Radmanović, Svjetlana and Marković, Mirjana and Živković, Nikola and Čokeša, Đuro and Jovanović, Uroš and Bogosavljević, Jelena",
year = "2021",
abstract = "Humic substances, including humic acids (HAs), are the most abundant fractions of soil organic matter. Their composition, structure and properties, determined by soil formation conditions, can be used as indicators of pedogenetic processes. In this study, elemental composition as very important part of HAs characterization was determined for humic acids isolated from the soils of Serbia developed under different pedogenetic conditions (Chernozem (CH), Smonica/Vertisol (VR), Rendzina/Regosol (RG), Pseudoglej/Planosol (PL) and Prelazni treset/Histosol (HI) and related to soil properties and origin. Soil samples were collected at 0 to 15-30 cm depth. Soil texture, organic C (soil organic matter for HI), and pH were determined by common methods. HA samples were isolated using a modified IHSS method. The C, H, and N contents of HA samples were determined using elemental analyzer (CHNS 628, LECO Corporation, USA) after drying the samples over P2O5 under vacuum. Their percentages were calculated on the ash-free basis. The oxygen content was obtained as the difference. The ash content was determined by a dry combustion method. The C/N, O/C, H/C and O/H atomic ratios were used as indicators of variations in HA properties as a function of HA origin. Internal oxidation degree (ω) was calculated by the equation: ω = (2O+3N-H)/C, where: O, N, H and C are element contents (atomic %). Elemental compositions of investigated HAs fall within the range of average values reported for soil HAs. According to the humification degree obtained, HAs studied are ranged as follows: CH>VR>RG>HI>PL. Both correlations done (H/C versus O/C and H versus C) separate HAs in three groups: CH and VR - the most dehydrogenated and demethylated, i.e. the most stable; RG - the most oxidated; and HI and PL - the most hydrogenated. HAs elemental composition is related to soil organic C and pH, but not related to soil clay. Internal oxidation degree is used as an indicator of plant residue humification progress. Positive ω values point out well drained soils with prevailing oxidizing conditions and negative values reflect anaerobic soil conditions. Internal oxidation degree values are obviously lower in hydromorphic HI and PL HAs compared to terrestrial RG, CH and VR HAs, but positive values indicate predominance of aerobic under anaerobic conditions in surface layer of hydromorphic soils. Results obtained in this study are in agreement with the literature data, indicating characteristics of HAs as particularly dependant on environmental conditions.",
publisher = "Serbian Society of Soil Science",
journal = "3rd International and 15th National Congress of Serbian Society of Soil Science: Soils for Future under Global Challenges, Sokobanja, Serbia",
title = "ELEMENTAL COMPOSITION OF HUMIC ACIDS ISOLATED FROM CHERNOZEM, VERTISOL, REGOSOL, PLANOSOL AND HISTOSOL",
pages = "70-64",
url = "https://hdl.handle.net/21.15107/rcub_agrospace_6650"
}

Radmanović, S., Marković, M., Živković, N., Čokeša, Đ., Jovanović, U.,& Bogosavljević, J.. (2021). ELEMENTAL COMPOSITION OF HUMIC ACIDS ISOLATED FROM CHERNOZEM, VERTISOL, REGOSOL, PLANOSOL AND HISTOSOL. in 3rd International and 15th National Congress of Serbian Society of Soil Science: Soils for Future under Global Challenges, Sokobanja, Serbia
Serbian Society of Soil Science., 64-70.
https://hdl.handle.net/21.15107/rcub_agrospace_6650

Radmanović S, Marković M, Živković N, Čokeša Đ, Jovanović U, Bogosavljević J. ELEMENTAL COMPOSITION OF HUMIC ACIDS ISOLATED FROM CHERNOZEM, VERTISOL, REGOSOL, PLANOSOL AND HISTOSOL. in 3rd International and 15th National Congress of Serbian Society of Soil Science: Soils for Future under Global Challenges, Sokobanja, Serbia. 2021;:64-70.
https://hdl.handle.net/21.15107/rcub_agrospace_6650 .

Radmanović, Svjetlana, Marković, Mirjana, Živković, Nikola, Čokeša, Đuro, Jovanović, Uroš, Bogosavljević, Jelena, "ELEMENTAL COMPOSITION OF HUMIC ACIDS ISOLATED FROM CHERNOZEM, VERTISOL, REGOSOL, PLANOSOL AND HISTOSOL" in 3rd International and 15th National Congress of Serbian Society of Soil Science: Soils for Future under Global Challenges, Sokobanja, Serbia (2021):64-70,
https://hdl.handle.net/21.15107/rcub_agrospace_6650 .

TY  - JOUR
AU  - Radmanović, Svjetlana
AU  - Marković, Mirjana M.
AU  - Jovanović, Uroš D.
AU  - Gajić-Kvascev, Maja D.
AU  - Čokeša, Djuro M.
AU  - Lilić, Jasmina A.
PY  - 2020
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/5393
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, 1.883.25 (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.
PB  - Srpsko hemijsko društvo, Beograd
T2  - JOURNAL OF THE SERBIAN CHEMICAL SOCIETY
T1  - Properties of humic acids from copper tailings 20 years after reclamation
EP  - 419
IS  - 3
SP  - 407
VL  - 85
DO  - 10.2298/JSC190717112R
ER  - 

@article{
author = "Radmanović, Svjetlana and Marković, Mirjana M. and Jovanović, Uroš D. and Gajić-Kvascev, Maja D. and Čokeša, Djuro M. and Lilić, Jasmina A.",
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, 1.883.25 (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.",
publisher = "Srpsko hemijsko društvo, Beograd",
journal = "JOURNAL OF THE SERBIAN CHEMICAL SOCIETY",
title = "Properties of humic acids from copper tailings 20 years after reclamation",
pages = "419-407",
number = "3",
volume = "85",
doi = "10.2298/JSC190717112R"
}

Radmanović, S., Marković, M. M., Jovanović, U. D., Gajić-Kvascev, M. D., Čokeša, D. M.,& Lilić, J. A.. (2020). Properties of humic acids from copper tailings 20 years after reclamation. in JOURNAL OF THE SERBIAN CHEMICAL SOCIETY
Srpsko hemijsko društvo, Beograd., 85(3), 407-419.
https://doi.org/10.2298/JSC190717112R

Radmanović S, Marković MM, Jovanović UD, Gajić-Kvascev MD, Čokeša DM, Lilić JA. 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, Marković, Mirjana M., Jovanović, Uroš D., Gajić-Kvascev, Maja D., Čokeša, Djuro M., Lilić, Jasmina A., "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  - Savić-Bisercić, Marjetka
AU  - Pezo, Lato
AU  - Sredović-Ignjatović, Ivana
AU  - Ignjatović, Ljubiša M.
AU  - Savić, Andrija
AU  - Jovanović, Uroš D.
AU  - Andrić, Velibor
PY  - 2016
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/4030
AB  - Two mechanical extraction techniques were used for the extraction of environmentaly interesting components of coal fly ash: shaking, during which the extraction process lasted from 6 up to 24 h, and sonication that lasted from 15 up to 60 min, using water as extractant. The concentration of anions in fly ash extracts was determined by ion chromatography, while atomic absorption spectrometry was used for determination of: As, Pb, Cd, Ni, Cr, Zn, Cu, Fe, Mn and Al. The ultrasonication yielded slightly higher amounts of extracted anions as well as Pb, Al, Mn and Fe cations, while shaking-assisted extraction was more efficient for the Cr, As, Zn and Ni ions. The changes in pH value, particle size distribution within colloid solution, zeta potential and conductivity during ultrasound-assisted extraction were measured in order to explain changes that occur on the surface of fly ash particles contacting water and different processes (adsorption, ion exchange and flocculation) that develop under natural conditions. Principal Component Analysis was used for assessing the effect of observed process parameters. It is essential to evaluate quantity of these elements leachable from coal fly ash into the surface waters in natural conditions in order to prevent contamination of the environment.
PB  - Srpsko hemijsko društvo, Beograd
T2  - JOURNAL OF THE SERBIAN CHEMICAL SOCIETY
T1  - Ultrasound and shacking-assisted water-leaching of anions and cations from fly ash
EP  - 827
IS  - 7
SP  - 813
VL  - 81
DO  - 10.2298/JSC151222027B
ER  - 

@article{
author = "Savić-Bisercić, Marjetka and Pezo, Lato and Sredović-Ignjatović, Ivana and Ignjatović, Ljubiša M. and Savić, Andrija and Jovanović, Uroš D. and Andrić, Velibor",
year = "2016",
abstract = "Two mechanical extraction techniques were used for the extraction of environmentaly interesting components of coal fly ash: shaking, during which the extraction process lasted from 6 up to 24 h, and sonication that lasted from 15 up to 60 min, using water as extractant. The concentration of anions in fly ash extracts was determined by ion chromatography, while atomic absorption spectrometry was used for determination of: As, Pb, Cd, Ni, Cr, Zn, Cu, Fe, Mn and Al. The ultrasonication yielded slightly higher amounts of extracted anions as well as Pb, Al, Mn and Fe cations, while shaking-assisted extraction was more efficient for the Cr, As, Zn and Ni ions. The changes in pH value, particle size distribution within colloid solution, zeta potential and conductivity during ultrasound-assisted extraction were measured in order to explain changes that occur on the surface of fly ash particles contacting water and different processes (adsorption, ion exchange and flocculation) that develop under natural conditions. Principal Component Analysis was used for assessing the effect of observed process parameters. It is essential to evaluate quantity of these elements leachable from coal fly ash into the surface waters in natural conditions in order to prevent contamination of the environment.",
publisher = "Srpsko hemijsko društvo, Beograd",
journal = "JOURNAL OF THE SERBIAN CHEMICAL SOCIETY",
title = "Ultrasound and shacking-assisted water-leaching of anions and cations from fly ash",
pages = "827-813",
number = "7",
volume = "81",
doi = "10.2298/JSC151222027B"
}

Savić-Bisercić, M., Pezo, L., Sredović-Ignjatović, I., Ignjatović, L. M., Savić, A., Jovanović, U. D.,& Andrić, V.. (2016). Ultrasound and shacking-assisted water-leaching of anions and cations from fly ash. in JOURNAL OF THE SERBIAN CHEMICAL SOCIETY
Srpsko hemijsko društvo, Beograd., 81(7), 813-827.
https://doi.org/10.2298/JSC151222027B

Savić-Bisercić M, Pezo L, Sredović-Ignjatović I, Ignjatović LM, Savić A, Jovanović UD, Andrić V. Ultrasound and shacking-assisted water-leaching of anions and cations from fly ash. in JOURNAL OF THE SERBIAN CHEMICAL SOCIETY. 2016;81(7):813-827.
doi:10.2298/JSC151222027B .

Savić-Bisercić, Marjetka, Pezo, Lato, Sredović-Ignjatović, Ivana, Ignjatović, Ljubiša M., Savić, Andrija, Jovanović, Uroš D., Andrić, Velibor, "Ultrasound and shacking-assisted water-leaching of anions and cations from fly ash" in JOURNAL OF THE SERBIAN CHEMICAL SOCIETY, 81, no. 7 (2016):813-827,
https://doi.org/10.2298/JSC151222027B . .

TY  - JOUR
AU  - Jovanović, Uroš D.
AU  - Marković, Mirjana M.
AU  - Cupać, Svjetlana
AU  - Tomić, Zorica
PY  - 2013
UR  - http://aspace.agrif.bg.ac.rs/handle/123456789/3093
AB  - Humic acids (HAs), similar to other fractions of humic substances (HSs), have a large number of reactive functional groups enabling them to aggregate in solutions. Regardless of the origin of humic acid (aqueous or soil), this aggregation process is dependent on environmental conditions and strongly influences the mobility of soluble ionic and molecular pollutants. The aim of this work was to monitor the aggregation process of two humic acids isolated from different mineral soils (IHSS Elliot soil HA standard and Rendzic Leptosol HA) in the 2-11 pH range. Changes in aggregate size in HA sols were followed up using dynamic light scattering (DLS), while zeta potential (ZP) measurements in the same pH range were performed applying laser Doppler electrophoresis (LDE) technique. The effect of HA sol concentration and soil source on aggregation was examined as well. Besides, HA samples were characterized using Fourier transform infrared (FT-IR) spectroscopy. By inspecting HA-particle-size dependence on pH, it can be concluded that both HAs in corresponding sols behave as molecular aggregates or supramolecular structures, formed from small individual moieties (sizes  lt  10 nm) at higher pH values. The ZP vs. pH curve for both HAs revealed the ZP minimum in the 5-7 pH range, caused most likely by dissociation of acidic functional groups prevailing at lower pH values and deaggregation predominating over dissociation at higher pH values.
PB  - Wiley-V C H Verlag Gmbh, Weinheim
T2  - Journal of Plant Nutrition and Soil Science
T1  - Soil humic acid aggregation by dynamic light scattering and laser Doppler electrophoresis
EP  - 679
IS  - 5
SP  - 674
VL  - 176
DO  - 10.1002/jpln.201200346
ER  - 

@article{
author = "Jovanović, Uroš D. and Marković, Mirjana M. and Cupać, Svjetlana and Tomić, Zorica",
year = "2013",
abstract = "Humic acids (HAs), similar to other fractions of humic substances (HSs), have a large number of reactive functional groups enabling them to aggregate in solutions. Regardless of the origin of humic acid (aqueous or soil), this aggregation process is dependent on environmental conditions and strongly influences the mobility of soluble ionic and molecular pollutants. The aim of this work was to monitor the aggregation process of two humic acids isolated from different mineral soils (IHSS Elliot soil HA standard and Rendzic Leptosol HA) in the 2-11 pH range. Changes in aggregate size in HA sols were followed up using dynamic light scattering (DLS), while zeta potential (ZP) measurements in the same pH range were performed applying laser Doppler electrophoresis (LDE) technique. The effect of HA sol concentration and soil source on aggregation was examined as well. Besides, HA samples were characterized using Fourier transform infrared (FT-IR) spectroscopy. By inspecting HA-particle-size dependence on pH, it can be concluded that both HAs in corresponding sols behave as molecular aggregates or supramolecular structures, formed from small individual moieties (sizes  lt  10 nm) at higher pH values. The ZP vs. pH curve for both HAs revealed the ZP minimum in the 5-7 pH range, caused most likely by dissociation of acidic functional groups prevailing at lower pH values and deaggregation predominating over dissociation at higher pH values.",
publisher = "Wiley-V C H Verlag Gmbh, Weinheim",
journal = "Journal of Plant Nutrition and Soil Science",
title = "Soil humic acid aggregation by dynamic light scattering and laser Doppler electrophoresis",
pages = "679-674",
number = "5",
volume = "176",
doi = "10.1002/jpln.201200346"
}

Jovanović, U. D., Marković, M. M., Cupać, S.,& Tomić, Z.. (2013). Soil humic acid aggregation by dynamic light scattering and laser Doppler electrophoresis. in Journal of Plant Nutrition and Soil Science
Wiley-V C H Verlag Gmbh, Weinheim., 176(5), 674-679.
https://doi.org/10.1002/jpln.201200346

Jovanović UD, Marković MM, Cupać S, Tomić Z. Soil humic acid aggregation by dynamic light scattering and laser Doppler electrophoresis. in Journal of Plant Nutrition and Soil Science. 2013;176(5):674-679.
doi:10.1002/jpln.201200346 .

Jovanović, Uroš D., Marković, Mirjana M., Cupać, Svjetlana, Tomić, Zorica, "Soil humic acid aggregation by dynamic light scattering and laser Doppler electrophoresis" in Journal of Plant Nutrition and Soil Science, 176, no. 5 (2013):674-679,
https://doi.org/10.1002/jpln.201200346 . .