辽宁大长山海洋牧场拟建海域表层沉积物重金属潜在生态风险的评价

Potential ecological risk evaluation of heavy metals in surface sediments in the expected marine ranching area in Dachangshan waters

根据2013年5月、8月、11月3次对大长山海洋牧场拟建海域表层沉积物重金属调查资料,分析了沉积物重金属的污染程度和潜在风险程度。结果表明:沉积物重金属Pb、Cd、Cu、Zn、As、Hg单因子污染指数均小于1,综合污染指数均小于5,为低污染;重金属含量均处于低潜在生态风险水平(单因子风险指数<40),各调查站位重金属也均处于低潜在生态风险水平(综合风险指数<95)。研究表明,拟建海域表层沉积物重金属处于低潜在生态风险,从沉积物重金属指标判断,适宜大长山海洋牧场建设。

The heavy metals pollution and potential risk were analyzed by the data of heavy metals in the surface sediments surveyed in the expected marine ranching area in Dachangshan waters in May,August and November of 2013. The single pollution indices of six heavy metals Pb,Cd,Cu,Zn,As and Hg was found to be less than 1,and their integrated pollution indices〈 5,showing a low pollution level. There were low levels of potential ecological risk in heavy metal concentrations at all the survey stations as the single factor risk indices was found less than 40,and the integrated risk indices less than 95. The findings indicate that the proposed waters are suitable for construction of marine ranching area due to a good quality of surface sediments and a low potential ecological risk.