【摘要】 选取新型土壤改良剂对某铅锌矿区附近土壤进行重金属复合污染修复实验,进而评价效果,并分析其影响因素。结果表明:新型土壤改良剂可显著减少土壤Pb和Cd的重金属毒性,与对照相比,土壤TCLP-Pb、TCLP-Cd的浸出毒性含量最高下降分别为41. 4%、28. 87%。经过化学稳定修复,新型土壤改良剂可显著降低Pb和Cd可交换态含量,土壤Pb和Cd有效形态含量最高下降率分别为64. 69%、41. 95%,修复效果Pb>Cd,说明新型土壤改良剂可促进土壤Pb和Cd从不稳定态向稳定态转化。新型土壤改良剂对溶液中Pb和Cd有一定吸附效果,符合Langmuir和Freundlich等温吸附模型,推理新型土壤改良剂降低土壤Pb和Cd毒性原因可能是发生络合化学反应和吸附作用。更多还原

【Abstract】 A compound heavy metal pollution test for the soil near lead-zinc mining areas was conducted with a new soil amendment,then the effect was further evaluated and influencing factors were analyzed. The results showed that the new soil amendment can significantly reduce the toxicity of Pb and Cd heavy metals in soil. Compared with control group,the leaching toxicity contents of TCLP-Pb and TCLP-Cd in soil respectively reduced by 41. 4% and 28. 87% at most. After chemically stabilized remediation,the new soil amendment dramatically decreased exchangeable Pb and Cd contents,and the maximum reduction rate of available Pb and Cd contents in soil was 64. 69% and 41. 95%,respectively,and the remediation effect on lead was better than that of cadmium. It was indicated that the new soil amendment treatment could facilitate the transformation of Pb and Cd in soil from unstable forms to stable forms. The new soil amendment had an adsorption effect on Pb and Cd in solution and it fitted well with Langmuir and Freundlich isothermal adsorption models. It was inferred that the reduction of toxicity of Pb and Cd in soil may come from chemical reactions and adsorption.更多还原