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Transference Characteristics of Heavy Metals in Land Reclamation of Indigenous Zinc Smelting Areas

LIN Wen-jie et al(Hanshan Normal University,Chaozhou,Guangdong 521041)  
[Objective] The study aimed to analyze the distributions characters of Pb,Zn and Cd in pollution soil profiles around waste residue and zinc smelting areas.[Method] Each point was selected to make the stratified sampling at the waste land and the cultivated land near the waste land,3 samples were selected at different position of the same deep of every profile,the external soil method was used to make reclamation.10 treatments was designed in the waste land to make the simulation experiment on transference of heavy metals in waste residue and research the migration law of Pb,Zn,Cd in the waste residue.[Result] Pb, Zn,Cd in waste residue surface were 3 453,5 678,23 mg/kg,respectively,and the heavy metals content was basically identical on the waste residue profile.The Pb,Zn,Cd in surface soil near the smelting area were 325,523,9.6 mg/kg and the polluted heavy metals transferred downwards gradually,the waste residue heavy metals didn't transfer obviously to upper soil.Pb had not obvious transference scarcely to subsoil,but Zn and Cd transferred obviously to subsoil and the transference of Cd was biggest.[Conclusion] The alkali lime isolation layer could effectively control the transference of heavy metals in waste residue to subsoil.
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