Comparison of the effects of phosphate materials on immobilizing cadmium in soil
A study was conducted to compare the effects of phosphate (P) materials in reducing cadmium extractability. Seven P materials (Commercial P fertilizers: fused phosphate (FP), and fused and superphosphate (FSP), rock phosphate (RP), P chemicals: Ca(H<,2>PO<,4>)<,2>·H<,2>O, (NH<,4>)<,2>HPO <,4>, KH<,2>PO<,4>, and K<,2>HPO<,4>) were selected for the test. The Selected P sources were mixed with a Cd-contaminated soil at the rate of 0, 200, 400, 800, and 1600mg (P)·kg<-1> and then incubated for 8 weeks. FSP and (NH<,4>)<,2>HPO<,4> increased Cd extractability at low level of P application (400mg·kg<- 1>), contrary to our expectations, and there-after, significantly decreased with increasing application level. However, RP scarcely affected soil Cd extractability. FP, Ca(H<,2>PO<,4>)<,2>·H<,2>O, KH<,2>PO<,4>. and K<,2>HPO<,4> significantly deceased NH<,4> OAc-extractable Cd concentrations with increasing application rates. Cadmium extractability might be more significantly affected by soil pH and negativity changes than the Cd-P precipitation reaction. P chemicals were more effective in reducing Cd extractability than commercial P fertilizers, due to their higher solubility. Of the selected P materials, K<,2>HPO<,4> was the most effective in reducing Cd extractability.
Cadmium Cd-extractability pH phosphate upland soil
C. O. Hong P. J. Kim
Division of Applied Life Science, Graduate School, Gyeongsang National University, 900, Kaswa-dong, Jinju, 660-701, South Korea
国际会议
第九届痕量元素生物地球化学国际会议(9th International Conference on the Biogeochemistry of Trace Elements)
北京
英文
176-177
2007-07-15（万方平台首次上网日期，不代表论文的发表时间）