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Influence of dissolved organic matter on the solubility of heavy metals in sewage-sludge-amended soils

Ashworth, D. J. and Alloway, B. J. (2008) Influence of dissolved organic matter on the solubility of heavy metals in sewage-sludge-amended soils. Communications in Soil Science and Plant Analysis, 39 (3-4). pp. 538-550. ISSN 0010-3624

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To link to this item DOI: 10.1080/00103620701826787

Abstract/Summary

Sewage-sludge-amended soils generally contain elevated levels of organic matter and heavy metals compared to control soils. Because organic matter is known to complex with heavy metals, the solubility behavior of the organic matter in such soils may exert a significant influence on the solubility of the metals. Little is known about such a process. Using batch experiments in which the solubility of organic matter in a heavily sludge-amended soil was artificially manipulated, we show that the solubilities of the heavy metals copper (Cu), nickel (Ni), and lead (Pb) show a strong positive relationship to the solubility of organic matter, particularly at high pH. The results suggest that under field conditions, spatiotemporal variations in the solid-solution partitioning of organic matter may have a bearing on the environmental significance (mobility and bioavailability) of these heavy metals.

Item Type:Article
Divisions:Faculty of Science > School of Archaeology, Geography and Environmental Science
Interdisciplinary centres and themes > Soil Research Centre
ID Code:3212
Uncontrolled Keywords:DOC DOM organo-metals solid-solution partitioning sorption COPPER NICKEL ZINC CADMIUM CARBON BIOSOLIDS MOVEMENT MOBILITY SORPTION COMPOST
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