浙南沿海沉积物中重金属污染及其潜在生态危害评价

测定了浙南沿海苍南霞关（CN）、洞头霓屿（DT）和乐清清江口（QJK）海域表层沉积物中重金属的含量，并采用Hakanson潜在生态危害指数法对其生态危害进行评价。结果表明，这3个地区各个站点的重金属污染状况呈现一定的相似性，Cu，Pb，Zn和Cr均属于中等污染程度；3个地区平均综合污染指数分别为6.44，7.23，6.45，属于低污染程度。3个地区的生态风险指数表现为DT（45.29）＞CN（42.26）＞QJK（42.16），指数数值都小于150，属于低生态危害程度，在空间分布上，苍南霞关和乐清清江口呈现近岸高、远岸低，湾内高、湾外低的变化趋势。

Ecological risk of heavy metals in surface sediment in coastal areas in southern Zhejiang

The contents of heavy metals in surface sediment in coastal areas in southern Zhejiang were analyzed， and the ecological risk of heavy metals were assessed by Hakanson potential ecological risk index method and coefficient of contaminates. It was shown that the situations of heavy metals pollution of each sampling site in the three areas were similar. The contamination status of Cu， Pb， Zn and Cr reached medium level. The average comprehensive pollution index of the three areas was 6.44， 7.23 and 6.45， respectively， which belonged to the low pollution level. The ecological risk index of the three areas decreased as DT（45.29）>CN（42.26）>QJK （42.16）， which were all below 150 and exhibited low ecological risk. For spatial distribution， the pollution level reduced by degrees with the distance far away from the coast in CN and QJK.