[Effects of Two Amendments on Remedying Garden Soil Complexly Contaminated with Pb, Cd and As].

This paper studied the effects of two amendments (iron sulfate[Fe2 (SO4)3] and calcium carbonate[CaCO3]) on the bioavailability of Pb, Cd and As in a garden soil and on the migration and accumulation of Pb, Cd and As in pepper through an in-situ experiment planting pepper plants. The results indicated that:①Addition of these amendments significantly decreased TCLP extractable contents of Pb and Cd in soil, and increased TCLP extractable contents of As.②Compared with the control group, addition of Fe2 (SO4)3 led to reduction in contents of Pb and Cd in pepper fruits by 7.2%-22.9% and 2.3%-2.9%, respectively, but no obvious changes were observed for As contents in pepper fruits. Meanwhile, addition of CaCO3 decreased the contents of Pb, Cd and As in pepper fruits by 15.8%-16.3%, 11.8%-15.0%, and 0.03%-53.2%, respectively. ③The maximum reductions for the translocation factors of Pb, Cd and As from stem to fruits in pepper plants were 16.7%, 68.0%, 10.2%, respectively, due to Fe2(SO4)3 application and 16.7%, 51.5%, 45.6%, respectively, due to CaCO3 application, compared with the control group. It was obvious that Fe2 (SO4)3 and CaCO3 could both effectively decrease the migration of soil Pb, Cd and As to pepper plants, but the effects of CaCO3 were better than those of Fe2 (SO4)3.