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TECHNICAL REPORTS

Heavy Metals in the Environment

Cadmium Solubility and Sorption in a Long-Term Sludge-Amended Arable Soil

Department of Soil Sciences, SLU, Box 7014, 750 07 Uppsala, Sweden

^* Corresponding author (nicholas.jarvis{at}mv.slu.se)

Received for publication October 14, 2004. Cadmium solubility and sorption in an arable clay loam soil that had received sewage sludge for 41 years were compared to an unsludged control in batch studies. Soil pH dominated Cd sorption, explaining >92% of the variation in K_d values in both treatments. At any pH, Cd sorption was apparently slightly but significantly (p < 0.05) smaller in the sludge-amended soil compared to the control, even though the organic carbon content was 70% larger and the ammonium oxalate–extractable iron content was roughly doubled. Correction for dissolved organic carbon (DOC) complexation with the speciation model WHAM reduced the difference in sorption between treatments, but the sludged soil still had significantly smaller K_d values (p < 0.01). Batch equilibrations without addition of Cd showed that there was no significant difference in the solubility of "native" cadmium (defined as EDTA-extractable Cd) in sludged and control soils. The reason for the lack of increase in Cd sorption in the sludge-amended soil has not been established, but it may be due to competition for sorption sites on humic compounds with sludge-derived Fe and trace metals such as zinc. The fact that the pyrophosphate-extractable (i.e., organically associated) iron content was seven times larger in the sludged soil provides some supporting evidence for this hypothesis.

Abbreviations: CEC, cation exchange capacity • DOC, dissolved organic carbon • SS, sewage sludge

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JEQ 2005 34: v. [Full Text]