摘要：The aim of this study was to assess the potential of Red earth/mud as an ameliorant for Pb contamination. The results showed a significant reduction of toxicity with soils contaminated with PbS, PbSO4, PbNO3 and PbCO3. Critical issues raised during the study showed that red mud drastically reduced lead contamination most probably due to shifting of lead from the exchangeable to the Fe-oxide fraction through specific chemisorption and diffusion mechanisms including a reduction of solubility and mobility of Pb. However, speciation pattern of different lead compounds need to be tied to bioavailability to reliably characterize the adsorption behaviour of lead.
