贵屿电子垃圾处理对河流底泥及土壤重金属污染

Heavy metals in sediments and soils contaminated by electronic waste recycling in Guiyu town

以广东省汕头市贵屿镇电子垃圾处理场为对象,主要研究了电子垃圾场附近河流的底泥和农田土壤中重金属形态分布特征。结果表明,底泥中Cd、Cr、Cu、Pb、Zn质量分数分别为52.9-67.1、309-359、79.2-1485、391-449、37.5-111 mg.kg^-1;土壤中Cd、Cr、Cu、Pb、Zn的平均质量分数分别是54.1-57.1、278-320、93.5-116、382-415、46.2-68.1 mg.kg^-1。底泥和土壤中Cd、Cr、Cu、Pb均超过《土壤环境质量标准》（GB15618—1995）二级标准,其中以Cd和Cu污染最为严重。底泥及土壤中重金属的地球化学形态分布规律基本一致。重金属具有较高迁移性,重金属的迁移性为Cd〉Cr〉Pb〉Zn〉Cu。

A field investigation was carried out on characteristics of heavy metals in the sediments and soils nearby electronic waste recycling sites in Guiyu town,Shantou city,Guangdong Province.The results showed that the concentrations of Cd,Cr,Cu,Pb,Zn were 52.9~67.1,309~359,79.2~1485,391~449,37.5~111 mg.kg-1 in sediment,respectively.Concentrations of Cd,Cr,Cu,Pb,Zn were 54.1~57.1,278~320,93.5~116,382~415,46.2~68.1 mg.kg-1 in soil,respectively.Concentrations of Cd,Cr,Cu and Pb were more than the secondary category of soil environmental quality standard（GB15618-1995）,of which the most serious pollutions were Cd and Cu.The geochemical distribution of heavy metals in sediment and soil is similarly.The mobility of heavy metals were CdCrPbZnCu.