Immobilizing soil exogenous lead using rock phosphate
2010
Jiang, Guanjie | Hu, Hongqing | Liu, Yonghong | Cai, Zhijian | Yang, Haizheng
The effect of rock phosphate (PR) on exogenous forms of Pb in yellow cinnamon soil (S1) and latosol soil (S2) were studied by Tessier’s sequential extraction procedures after PR was applied into the two soils at four levels of P 0, 50, 500 and 2000 mg kg-1 soil. The results indicated that the content of exchangeable Pb in two soils decreased significantly with the rising of PR amount, which reached the minimum of 2.95 mg kg-1 for yellow cinnamon soil and 3.57 mg kg-1 for latosol soil under the treatment of P 2000 mg kg-1 soil (PR3); the content of carbonate-bound Pb changed marginally; with the increase of PR amount in the two soils, the content of Fe-Mn oxide-bound Pb minished while the content of organic compound-bound Pb increased. The residual fraction of Pb in the two soils reached the maximum under the treatment of P 2000 mg kg-1 soil, 38.5 mg kg-1 for yellow cinnamon soil and 66.1 mg kg-1 for latosol soil. After the two soils being applied with testing PR, the content of exogenous exchangeable Pb decreased and residual fraction augmented conversely for both soils. In conclusion, the results reflected that Pb had been immobilized effectively by PR in the two soils.
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