Self-aggregation of soil humic acids with respect to their structural characteristics
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 differ...
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| Format: | Article |
| Language: | English |
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Serbian Chemical Society
2022-01-01
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| Series: | Journal of the Serbian Chemical Society |
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| Online Access: | http://www.doiserbia.nb.rs/img/doi/0352-5139/2022/0352-51392200010J.pdf |
| _version_ | 1811312706532147200 |
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| author | Jovanović Uroš D. Marković Mirjana M. Čokeša Đuro M. Živković Nikola V. Radmanović Svjetlana B. |
| author_facet | Jovanović Uroš D. Marković Mirjana M. Čokeša Đuro M. Živković Nikola V. Radmanović Svjetlana B. |
| author_sort | Jovanović Uroš D. |
| collection | DOAJ |
| description | 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. |
| first_indexed | 2024-04-13T10:40:17Z |
| format | Article |
| id | doaj.art-684e620c22be4a91841554c770198f80 |
| institution | Directory Open Access Journal |
| issn | 0352-5139 1820-7421 |
| language | English |
| last_indexed | 2024-04-13T10:40:17Z |
| publishDate | 2022-01-01 |
| publisher | Serbian Chemical Society |
| record_format | Article |
| series | Journal of the Serbian Chemical Society |
| spelling | doaj.art-684e620c22be4a91841554c770198f802022-12-22T02:49:56ZengSerbian Chemical SocietyJournal of the Serbian Chemical Society0352-51391820-74212022-01-0187676177310.2298/JSC211125010J0352-51392200010JSelf-aggregation of soil humic acids with respect to their structural characteristicsJovanović Uroš D.0https://orcid.org/0000-0003-2007-2549Marković Mirjana M.1https://orcid.org/0000-0001-6409-1800Čokeša Đuro M.2https://orcid.org/0000-0001-5724-0679Živković Nikola V.3https://orcid.org/0000-0003-3399-1229Radmanović Svjetlana B.4https://orcid.org/0000-0002-3416-6792University of Belgrade, Vinča Institute of Nuclear Sciences, Belgrade, SerbiaUniversity of Belgrade, Vinča Institute of Nuclear Sciences, Belgrade, SerbiaUniversity of Belgrade, Vinča Institute of Nuclear Sciences, Belgrade, SerbiaUniversity of Belgrade, Vinča Institute of Nuclear Sciences, Belgrade, SerbiaUniversity of Belgrade, Faculty of Agriculture, Belgrade, SerbiaThe 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.http://www.doiserbia.nb.rs/img/doi/0352-5139/2022/0352-51392200010J.pdffractionationesterificationcarboxyl groupphenolic groupaliphatic caromatic c |
| spellingShingle | 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 Journal of the Serbian Chemical Society fractionation esterification carboxyl group phenolic group aliphatic c aromatic c |
| title | Self-aggregation of soil humic acids with respect to their structural characteristics |
| title_full | Self-aggregation of soil humic acids with respect to their structural characteristics |
| title_fullStr | Self-aggregation of soil humic acids with respect to their structural characteristics |
| title_full_unstemmed | Self-aggregation of soil humic acids with respect to their structural characteristics |
| title_short | Self-aggregation of soil humic acids with respect to their structural characteristics |
| title_sort | self aggregation of soil humic acids with respect to their structural characteristics |
| topic | fractionation esterification carboxyl group phenolic group aliphatic c aromatic c |
| url | http://www.doiserbia.nb.rs/img/doi/0352-5139/2022/0352-51392200010J.pdf |
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