浙江嵊泗贻贝养殖海域环境及贝体重金属含量分布特征与潜在生态风险分析

根据2012和2013年嵊泗枸杞贻贝养殖区的调查资料,着重对水体、沉积物以及养殖贝体内重金属分布特征和潜在生态风险进行了分析,结果表明:(1)嵊泗枸杞贻贝养殖区海水中的重金属含量水平总体较低,全部小于第一类《海水水质标准》和《渔业水质标准》限值,水体环境良好,适合贝类养殖。(2)表层沉积物中6种重金属的综合潜在生态风险指数150,处于轻微污染水平,适合贝类养殖,但Hg潜在生态风险参数局部激增的特点需重点关注。(3)养殖贝类体内重金属残留量低于《无公害食品水产品中有毒有害物质限量》,食用安全良好,但Cd含量超过《海洋生物质量》第一类标准限值,值得引起关注。

The Distribution of Heavy Metals and Potential Ecological Risk Assessment around Shellfish Farming Area of Shengsi,Zhejiang

According to the 2012 and 2013 survey data of Gouqi shellfish farming area, the distribution of heavy metals in the seawater and surface sediments were analyzed. Eco-environmental quality and potential e-cological risk in the shellfish farming area were also assessed. The results showed that：（1） In seawater, the lev-els of heavy metals were all less than the first degree of “Sea Water Quality Standard” and “Fishing Water Quality Standard” limit. （2） In surface sediments, the potential ecological risk indices （RI） of 6 kinds of heavy metals was less than 150, in the light pollution levels. But, the potential ecological risk factor of Hg in G4 showed strong hazard level. （3） The contents of heavy metals in shellfish were below the “Free Food Aquatic Hazardous substances”, showing good food safety. But, the content of Cd was over the first degree“Marine Bi-ological Quality”standard.