徐州矿务集团夹河煤矿煤矸山周围土壤重金属污染评价

对徐州矿务集团夹河煤矿煤矸山周围土壤中Cu,Pb,Cr,Cd,Zn5种重金属元素的污染状况研究结果表明:若与徐州地区土壤背景值作比较,5种重金属元素都有超标现象,单项污染指数均大于1,综合污染指数高达7.01;若对照土壤一级标准,在5种重金属元素中,有Cu,Pb,Cd和Zn4种元素存在超标现象,Cr也接近1,综合污染指数为4.81;若对照土壤二级标准,Cd和Zn2种元素存在超标现象,综合污染指数为1.59.说明煤矸山周围土壤受到一定程度的重金属污染,尤其以Cd污染最为严重.

Evaluation of soil pollution by heavy metals around the gangue hills in Jiahe Coal Mine of Xuzhou Coal Group

The polluted conditions of five heavy metals of Cu,Pb,Cr,Cd and Zn in the soil around the gangue hills in Jiahe Coal Mine of Xuzhou Coal Group were investigated.The results showed that the contents of Cu,Pb,Cr,Cd and Zn in the soil were detected higher than those in soil of other regions of Xuzhou as background and the single pollution index of each heavy metal was higher than 1.The comprehensive pollution indices were as high as 7.01.In contrast to the heavy metal content standards of the first grade soil,the contents of Cu,Pb,Cd and Zn in the soil exceeded the standard and the single pollution index of Cr was close to 1.The comprehensive pollution indices were as high as 4.81.In contrast to the heavy metal content standards of the second grade soil,the contents of Cu and Zn in the soil exceeded the standard.The comprehensive pollution indices were as high as 1.59.All of these indicated that the soil around the gangue hills in Jiahe Coal Mine was polluted by heavy metals,especially the pollution of Cd.