Examining the integrity of soil metal bioavailability assays in the presence of organic amendments to metal-spiked soils

Abstract

This paper questions whether the presence of biosolids amendment in metal-spiked soils alters the outcome of soil-based assays of metal bioavailability. The effects of biosolids amendment on the efficacies of six soil metal bioavailability assays (total recoverable, EDTA, Ca(NO 3) 2, soil solution, diffusive gradient in thin films and free ion activity) were assessed against metal concentrations in wheat shoots (Triticum aestivum) germinated in three contrasting soils, each previously incubated for either 2weeks or 6months following treatment with Cd, Cu, Ni and Zn +/- biosolids amendment. Overall, Ca(NO 3) 2 was the most accurate method to predict Cd (r 2=0.62), Ni (r 2=0.73) and Zn (r 2=0...