大孤山矿区土壤重金属形态分布特征及影响因素

Distribution Characteristic of Heavy Metal Chemical Form and Its Influencing Factors around the Dagushan Mine District

目的分析了大孤山铁矿尾矿库及周边景区重金属形态分布及理化指标对重金属形态的影响,为矿区重金属污染修复治理方面提供科学依据.方法采用Tessier 5步连续提取法对土壤中Cu、Zn、Pb、Cd、Ni等5种重金属元素的形态进行了分析,并用相关分析法分析了重金属各形态与土壤理化性质的关系.结果 Cu主要以残渣态存在,有机结合态次之,Zn、Pb、Ni 3种金属的残渣态占绝对优势,Cd的可交换态是5种重金属中最高的.相关分析可知,pH对各重金属可交换态影响较大,OM是影响有机结合态和残渣态的主要因素,也是影响Pb可交换态的主要因素,Eh是影响Zn各形态和Ni残渣态的主要因素.结论 Cd有效态含量最高,占总量的32.25%,其他矿区重金属形态总体为残渣态为主,相关分析结果表明,不同金属的形态分布受到土壤理化性质的影响比较明显.

The paper studies the distribution of heavy metal forms and influencing factors in the tailing yard of Dagushan iron mine and surrounding scenic.A scientific control strategy for heavy mental pollution remediation in mining area is provided.Using the method of Tessier 5 continuous extraction and correlation analysis,the paper analyzes the relations between all kinds of heavy metal forms,such as Cu,Zn,Pb,Cd,Ni in the soil,and soil chemical properties.The results show that in the soil,most Cu is in residual f...