Publication Details |
| Category | Text Publication |
| Reference Category | Journals |
| DOI | 10.1560/J3BR-D8J6-8JU3-0VB9 |
| Title (Primary) | Binding of cadmium, copper and zinc to humic substances originating from municipal solid waste compost |
| Author | Kaschl, A.; Römheld, V.; Chen, Y. |
| Source Titel | Israel Journal of Chemistry |
| Year | 2002 |
| Department | GWS |
| Volume | 42 |
| Issue | 1 |
| Page From | 89 |
| Page To | 98 |
| Language | englisch |
| Abstract | The application of municipal solid waste (MSW) compost increases both the trace metal loading and the organic matter in the soil. To characterize the quality and metal‐binding capacity of the compost OM, we extracted humic acid (HA) and fulvic acid (FA) from mature MSW compost and analyzed them for elemental composition, acid‐titratable functional groups, total metal content, and structural components (by 13C NMR). HA constituted 67% of all extracted humic substances and differed significantly from HAs of cultivated lands: The compost HA exhibited smaller molecular size, a higher N content, and lower aromaticity due to large amounts of saturated aliphatic components. Metal complexation studies of the extracted HA and FA were performed by equilibrium dialysis titration. The complexing capacity (CC) was highest for Cu: CCHA = 3357 and CCFA = 5221 μmol Cu g−1 of dissolved organic carbon (DOC) at pH 5. Zn and Cd were bound (at pH 7) in smaller concentrations: CCHA(Zn) = 2167, CCFA(Zn) = 2809, CCHA(Cd) = 2386, and CCFA(Cd) = 2468 μmol metal g−1 of DOC. Stability constants for binding on the strongest sites (pKint) were determined as pKintHA = 6.6 and pKintFA = 7.3 for Cu at pH 5; and pKintHA = 8.0 and pKintFA = 6.4 for Cd at pH 7. Since these measured parameters fall within the ranges of values obtained for soil humic substances, we conclude that in soils with little organic matter, compost addition will significantly increase the amount of highly reactive organic complexing agents for trace metals in the soil. |
| Persistent UFZ Identifier | https://www.ufz.de/index.php?en=20939&ufzPublicationIdentifier=5643 |
| Kaschl, A., Römheld, V., Chen, Y. (2002): Binding of cadmium, copper and zinc to humic substances originating from municipal solid waste compost Isr. J. Chem. 42 (1), 89 - 98 10.1560/J3BR-D8J6-8JU3-0VB9 |
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