Abstract
The authors investigated cadmium sorption by soils of different chemical and mineralogical composition at soil solution concentrations between 0.001 and 12 ..mu..mol Cd kg/sup -1/. The application of municipal sewage sludge to the soils generally resulted in a decrease in the amount of Cd sorbed. S-curve isotherms were observed for Cd sorption by all soils, suggesting preferential association of Cd with aqueous solution components at low Cd solution concentrations. The removal of soluble organic material by a careful washing procedure resulted in Cd sorption following an L-curve isotherm, indicating that Cd in soils is complexed by aqueous organic ligands whose effect on adsorption is significant at low Cd concentrations (0.08 ..mu..mol kg/sub a//sup -1/).
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