舟山六横岛附近海域沉积物重金属污染及潜在生态风险评价

Pollution and potential ecological risks of heavy metals in surface sediment near Liuheng Island of Zhoushan

根据2010年3月、6月对舟山六横岛邻近海域表层沉积物重金属调查资料,采用单因子指数法和Hakanson生态风险指数法对Cu、Pb、Cd、Zn、Hg、As、Cr元素进行分析与评价,并与2010年8月舟山嵊泗近岸海域表层沉积物质量进行比较。研究结果表明:该海域沉积物综合污染程度为中等水平,各种元素污染程度高低依次为Zn>Cu>Cd>Pb>Cr>As>Hg,主要重金属污染因子为Zn、Cu、Cd元素。总体而言,该海域沉积物潜在生态风险性低,风险程度高低依次为Cd>Hg>Cu>Pb>As>Cr>Zn,其中各站位Cd的生态风险参数均值大于40,Cd为该海域的最大潜在生态风险因子。

According to the surveying data of heavy metals in the surface sediments near Liuheng Island of Zhoushan in Mar. and Jun. of 2010, the ecological risk evaluation of Cu, Pb, Cd, Zn, Hg, As in Hakanson was made with the single factor and Cr, compared with the surface sediments near Shengsi Island of Zhoushan in Aug. of 2010. The results showed that the surface sediments pollution level was middle, from low to high principle, the sequence of degree of pollution was Zn 〉 Cu 〉 Cd 〉 Pb 〉 Cr 〉 As 〉 Hg. The main pollution factors of heavy metal were Zn, Cu, Cd. The surface sediments potential Ecological risk was low, from low to high principle, the sequence of degree of risk was Cd 〉 Hg 〉 Cu 〉 Pb 〉 As 〉 Cr 〉 Zn , the value of Cd ecological risk parameter was more than 40 at all stations, the most fearful one of all potential ecological risk factors was Cd.