煤炭产区周边土壤重金属污染特征和风险评估

Characteristics and Risk Assessment of Soil Heavy Metal Pollution around Coal Producing Areas

以长治市襄垣县为研究区域,探究村庄、电厂、化工、煤矿及选煤厂周边土壤中Cr、Zn、As、Cd、Pb、Hg、Ni及Cu等8种重金属的差异性累积特征,采用Hakanson潜在生态风险指数法评价煤炭产业园区周边土壤重金属的污染程度和生态风险。结果表明:As在村庄周边土壤中的含量显著高于电厂、化工、煤矿及选煤厂;Hg在选煤厂周边土壤中的含量显著高于化工和煤矿;Hg和Cd的潜在风险指数均为最高,大体达到中等潜在生态风险水平以上。

In changzhi xiangyuan as the research area,to explore the villages,power plant,chemical industry,coal and coal preparation plant surrounding soil,Cr,Zn,As,Cd,Pb,Hg,Ni and Cu eight kinds of heavy metal difference accumulation characteristics,using Hakanson potential ecological risk index method to evaluate the soil of heavy metal pollution and ecological risk.The results show that the content of As in the surrounding soil is significantly higher than that of power plant,chemical,coal mines and coal preparation plant;the content of Hg in the soil around coal preparation plant is significantly higher than that of chemical and coal mines;the potential risk index of Hg and Cd is the highest,roughly above the medium potential ecological risk level.