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《Environmental Science》 1989-03
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Transport and Transformation of Some Heavy Metals in Soil and Research of Their Adsorp-tion Mechanism

Yang Chongjic (Department of Environmental Engineering, Tsinghua University, Beijing)  
Transport and transformation of Pb, Hg, Cd, As and Cr in soil and their adsorption mechanism researched by using scanning electron microscope and electron energy spectrometer is presented in this paper. The results show that the speciation and valence states of the five metals and their distribution in soil are different. The adsorption rates and stability are orderly as follows: Pb Hg Cd As Cr. The mechanism observed in the experiments is that Pb a nd Hg are adsorbed chemically, Cd physicochemistically, and As and Cr physically in majority.
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