Synergetic Control of Bioavailability of Pb, Cd and As in the Rice Paddy System by Combined Amendments

: This paper studied the effects of applying two combined amendments LST (limestone+meerschaum+titanium dioxide) and LSF (limestone+meerschaum+ferric sulfate) at different ratios of 0, 1, 2, 4, 8 and 16 g·kg-1 on bioavailability Pb, Cd and As in paddy soil and bioaccumulation in rice plants through a pot experiment planting rice. The results indicated that: 1Compared with the control, applying LST and LSF could both significantly increase soil pH values (P rice straw>root, and that transferring Cd was husk >root >rice straw. The ability to transfer Pb, Cd and As from rice straw to brown rice was Cd >As >Pb. 4After applying LST and LSF, a significant positive relationship was observed between contents of Pb, Cd and As in brown rice and exchangeable contents of these elements in soil. Between contents of Pb, Cd and As in brown rice and soil pH values, there was a significant negative correlation.