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《Environmental Science》 2011-02
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Effect and Mechanism of Immobilization of Cadmium and Lead Compound Contiminated Soil Using New Hybrid Material

WANG Lin1,2,XU Ying-ming1,2,LIANG Xue-feng1,2,SUN Yang1,2,QIN Xu1,2(1.Department of Pollution Control,Institute of Agro-Environmental Protection,Ministry of Agriculture,Tianjin 300191,China;2.Key Laboratory of Production Environment and Agro-Product Safety of Ministry of Agriculture and Tianjin Key Laboratory of Agro-Environment and Food Safety,Tianjin 300191,China)  
The effect of new hybrid material and its compound treatments with phosphate on immobilization of cadmium and lead in contaminated soil was investigated using a pot-culture experiment,and the immobilization mechanism of hybrid material was clarified through analysis of heavy metal fractions,sorption equilibration experiment and X-ray photoelectron spectroscopy(XPS).The single treatments of hybrid material could not significantly promote growth of Brassica chinensis,while the compound treatments of hybrid material and phosphate markedly increased dry biomass of shoots and roots,with maximal increases of 75.53% and 151.22%,respectively.Different hybrid material treatments could significantly reduce Cd and Pb concentrations in shoots,with maximal reductions of 66.79% and 48.62%,respectively,and the compound amendment treatments appeared more efficient than the single amendment treatments in reducing Cd and Pb uptake of B.chinensis.Different hybrid material treatments could significantly decrease concentrations of toxicity characteristic leaching procedure(TCLP) extractable Cd and Pb,and the compound hybrid material treatments appeared more efficient than the single treatments in reducing TCLP extractable Cd and Pb.Through the formation of bidentate ligand between metal ions and surface sulfhydryl by complexing reaction,the hybrid material could absorb and fix mobile fractions of Cd and Pb in soil,and promote transformation of acid extractable Cd and Pb into residual fraction,resulting in significant reduction of heavy metals bioavailability and mobility and then fixing remediation of contaminated soil.In summary,the compound treatment of hybrid material and phosphate is the most effective treatment for immobilization of Cd and Pb in contaminated soils,and the hybrid material inactivates Cd and Pb in soil mainly through special chemical adsorption.
【Fund】: 国家高技术研究发展计划(863)项目(2008AA06Z334);; 国家自然科学基金项目(40901154);; 天津市应用基础及前沿技术研究计划项目(10JCYBJC06300);; 中央级公益性科研院所基本科研业务费专项资金(农业部环境保护科研监测所)项目
【CateGory Index】: X53
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