舟山西蟹峙海洋倾倒区及邻近海域表层沉积物重金属污染及其生态风险评价

根据2011年7月浙江舟山西蟹峙海洋倾倒区及邻近海域表层沉积物重金属的监测结果,采用单因子指数法和Hakanson生态危害指数法分析表层沉积物重金属的污染特征,并评价其潜在生态风险。结果表明:沉积物重金属元素Cu、Zn、Pb、Cd、Cr、Hg、As含量均符合国家海洋沉积物质量一类标准;重金属元素污染程度由高到低依次为Zn、Cr、Pb、Cu、As、Cd、Hg,其中Cu、Pb、Cd、Hg和As 5种重金属元素为低污染水平,Zn和Cr 2种重金属元素为中等污染程度水平;7种重金属元素单个和综合潜在生态危害程度均为低风险水平,由高到低依次为Cd、Hg、As、Pb、Cu、Cr、Zn。

Evaluation on Heavy Metals Contamination and Potential Ecological Risk in the Surface Sediments of Xixiezhi Ocean Dumping Site and Its Adjacent Sea Area in Zhoushan City

Based on the monitoring data of the heavy metals in July 2011,the pollution characteristics of the heavy metals in the surface sediments in Xixiezhi Ocean Dumping Site and its adjacent sea area in Zhoushan City,China were studied by using the index technique of single factor and Hakanson ecological risk index,and the potential ecological risk of the contamination was evaluated.The results showed that the heavy metals of Cu,Zn,Pb,Cd,Cr,Hg and As were in accord with the first class of the marine sediment quality of National Standards;The order of heavy metals pollution index from high to low is Zn,Cr,Pb,Cu,As,Cd,Hg,and the pollution status level of Cu,Pb,Cd,Hg and As were low,but Zn and Cr were medium;The single and comprehensive potential ecological risk level of these seven heavy metals were low,and the order of heavy metals potential ecological risk from high to low is Cd,Hg,As,Pb,Cu,Cr,Zn.