深圳铜鼓航道表层沉积物中重金属含量及潜在生态危害

根据2009年9月深圳铜鼓航道表层沉积物中重金属含量的调查资料,采用单因子指数法和Hakanson生态风险指数法对其重金属污染特征及潜在生态风险进行了分析和评价。结果表明:重金属含量较低,属于国家一类海洋沉积物;表层沉积物已受到重金属Pb、Zn、As的污染,所有站位重金属综合污染指数均>5,达到中等污染水平,各重金属污染程度依次为Pb > Zn > As > Cu > Cr > Hg > Cd;重金属的潜在生态危害程度处于低度水平,潜在生态危害程度依次为Hg > As > Cd > Pb > Cu > Cr > Zn。

HEAVY METAL CONCENTRATION IN SURFACE SEDIMENTS OF SHENZHEN TONG-GU WATERWAY AND ASSESSMENT OF POTENTIAL ECOLOGICAL RISK

A survey of surface sediments was carried out in the Tong-gu waterway of Shenzhen in September, 2009. The pollution status of heavy metals was studied and the potential ecological risk assessed by the authors using the index technique of single factor and Hakanson ecological risk index.Results indicate that the sediments are low in concentration of heavy metals, belonging to the first class of sediments in accordance with the GB 18668-2002.The single index suggested that the surface sediments were polluted by Pb, Zn and As.The integrated pollution index for all sampling sites were larger than 5,having reached the moderate pollution level.Pollutants are in an order of Pb > Zn > As > Cu > Cr > Hg > Cd, and potential ecological risks in an order of Hg > As > Cd > Pb > Cu > Cr > Zn.It means that the surface sediments in the Tong-gu waterway of Shenzhen have no immediate ecological risk for the time being.