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According to previous research results, the proportions of exchangeable cadmium (Cd) and exchangeable lead (Pb) in the native soil were 38.3% and 43.2% with 52.7% and 30.5% removal efficiencies at most in the experiment, respectively. Speciation analysis on heavy metal in soil through Tessier¡¯s extraction procedure in five fractions demonstrated that washing remediation could not only remove the exchangeable form Cd and Pb (S1), but also wash almost all of carbonates bound (S2), and the content of reducible form(S3) was significantly reduced. (This paper doesn¡¯t give any data)  
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