温州市温瑞塘河表层沉积物重金属污染及生态风险评价

Heavy Metal Pollution in the Surface Sediment of Wenrui River in Wenzhou and Its Ecological Risk Assessment

对温瑞塘河不同水体干扰和沉积过程干扰类型的表层沉积物重金属进行研究,分析了沉积物As、Hg、Pb、Cd、Cr的含量、分布特征及pH特点。运用单因子污染指数评价,明确温瑞塘河表层沉积物重金属积累顺序为Cd>Cr>Pb>Hg>As。分别通过沉积物质量基准的风险评价和生态风险指数法评价了表层沉积物生态风险,提出温瑞塘河表层沉积物的As、Hg、Pb、Cd、Cr生态风险强度,明确Cd是沉积物中主导的污染因子。

The heavy metals in different kinds of surface sediment of Wenrui River were researched and the contents and distribution features of As,Hg,Pb,Cd,Cr and pH in the sediment were analyzed.As shown by the evaluation results by single factor pollution index,the heavy metal accumulation in the surface sediment of Wenrui River was Cd Cr Pb Hg As from high to low.Through the ecological risk assessment of the surface sediment based on quality standard and the exponent method of ecological risk,the ecological risk intensity of As,Hg,Pb,Cd and Cr in different kinds of the surface sediment of Wenrui Rive was presented and Cd was indentified to be the dominant pollution factor.