关键词: 镉, 污染, 土壤, 修复, 生物钝化, 微生物

Abstract: The site remediation of Cadmium contaminated soil was reviewed. The recent research in biostabilization of Cadmium in contaminated soil was summarized. The stabilization mechanisms were discussed with highlight，such as the bioprecipitation that microbial metabolites can react with Cadmium to form sulfide or phosphate precipitation，the biosorption that microbial cell walls and extracellular polymeric substances can adsorb Cadmium，and the biological uptake that Cadmium ions can pass through the cell membrane of microorganisms and be fixed in cells. Organic and inorganic stabilization were also introduced and evaluated. The state，e.g. ion-exchangeable，bound to carbonates，bound to iron and manganese oxides，bound to organic matter，and residual of Cadmium in soil，and the factors of pH， redox potential，organic matters，coexistent heavy metals and microorganisms which affect the consequential bioavailability of Cadmium were analyzed. Finally，the advantages of biostabilization technique and the fact that heavy metals cannot be removed from soil permanently by this technique were clarified，and the future direction that biostabilization technique should be combined with other techniques was pointed out.

Key words: Cadmium, pollution, soil, remediation, biostabilization, microorganism