云南某矿区下游农用地土壤重金属污染风险评价

RISK ASSESSMENT OF HEAVY METAL POLLUTION IN SOILOF AGRICULTURAL LAND DOWNSTREAM OF A MINING AREA IN YUNNAN

选取云南某铅锌矿矿区周边成片农用地采集土壤样品,采用单因子污染指数和内梅罗指数、地质累积指数及潜在生态风险评价法对土壤中Cd、Hg、As、Pb、Cr、Cu、Ni、Zn等8项重金属污染状况评价。结果表明,单因子污染指数法评价结果Cd>Cu>Pb>As,内梅罗指数法评价结果显示土壤综合污染指数1.07,污染等级中污染;地质累积指数法评价结果显示重金属累积程度表现为Hg>Cd>Pb>Zn>As>Cr=Cu;潜在生态风险评价法评价结果显示潜在生态风险指数RI为211.19,生态风险等级为中等生态危害,生态危害最重为Hg和Cd,且Hg>Cd,其余重金属均为轻微生态危害。

Soil samples were collected from agricultural lands surrounding a lead-zinc mining area in Yunnan.Various methods including the single-factor pollution index,Nemerow index,geological accumulation index,and potential ecological risk assessment were used to evaluate the pollution status of 8 heavy metals in soil,including Cd,Hg,As,Pb,Cr,Cu,Ni,and Zn.evaluation results of single factor pollution index method show that Cd>Cu>Pb>As.The evaluation results of the Nemerow index method reveals moderate pollution with a comprehensive pollution index of 1.07.The evaluation results of the geological accumulation index method show that the accumulation degree of heavy metals is as follows:Hg>Cd>Pb>Zn>As>Cr=Cu.The evaluation results ofthe potential ecological risk assessment method indicate a moderate ecological risk with a potential ecological risk index(RI)of 211.19.The most serious ecological hazards are Hg and Cd,with Hg>Cd,andthe other heavy metals are all minor ecological hazards.