温瑞塘河表层沉积物重金属污染与生态风险评价

Evaluation of Heavy Metal Pollution and Ecological Risk in Surface Sediment of Wenrui River

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地重金属进行研究，分析了沉积物As、Hg、Pb、Cd、Cr和pH的含量及分布特征。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，明确中Cd是沉积物中主导的污染因子。

Heavy metals of different kinds of surface sediment in Wenrui River were researched and contents of As, Hg, Pb, Cd and Cr in the sediment were analyzed. Results indicated that contents of analyzed heavy metals arranged in the order of Cd〉Cr〉Pb〉Hg〉As from highest to lowest pollution degree while single factor pollution evaluation was adopted. Ecological risk in surface sediment was evaluated by using risk evaluation which was based on quality standard and the exponent method of ecological risk. Ecological risk intensity of As, Hg, Pb, Cd and Cr in different kinds of surface sediment of Wenrui Rive was put forward and it showed that Cd was the dominant pollution factor.