【摘要】 重金属的毒性除与含量有关,还与其特定的化学形态关系密切。以优化的连续化学提取法(SCE)对矿区土壤中的Cd、Cr、Cu、Ni、Pb、Zn元素的赋存形态进行了提取,并分析了重金属元素形态分布规律及迁移能力。研究表明:6种元素总量均高于标准限制数倍不等,Cd和Pb超标倍数较高,分别为7.17倍和4.14倍,Cu、Ni和Zn其次,Cr最小。结合重金属总量、形态分布规律及迁移能力分析结果,该地区重金属风险等级为:Cd>Zn>Cu>Ni>Pb>Cr。重金属均以残渣态为主,阴雨潮湿偏酸的自然环境能促进重金属的释放并造成二次污染。因此,该地区存在较大的潜在重金属污染风险。更多还原

【Abstract】 Toxicity of heavy metals is related to the content.It is also closely related to its specific chemical speciation.The water soluble,weak acid,reducible,oxidizable and residual states of elements(Cd、Cr、Cu、Ni、Pb、Zn)are extracted.Contents of 6 elements in various chemical speciation are determined by ICP-MS.Speciation distribution and migration ability of heavy metals is analyzed.The results show that the total amount of heavy metals are higher than the soil environmental quality index.Cd and Pb are 7.17 times and4.14 times higher than those of Cu,Ni and Zn respectively,and Cr is the smallest.According to the analysis results of total heavy metals,morphology distribution and migration ability,the risk level of heavy metals in this area is Cd>Zn>Cu>Ni>Pb>Cr.Speciation of heavy metals is mainly residual state,and the natural environment of wet and humid acid can promote the release of heavy metals and cause two pollution.Therefore,there is a great potential risk of heavy metal pollution in the area.更多还原