珠江口表层沉积物有害重金属分布及评价

THE DISTRIBUTION AND ASSESSMENT OF HEAVY METALS IN SURFICIAL SEDIMENTS IN THE PEARL RIVER ESTUARY

应用近期珠江口水域表层沉积物有害重金属测试数据,分析了其分布特征及相互关系,并根据Hakanson潜在生态风险评估方法,计算分析了各单项因子潜在风险指数以及重金属风险指数(单项因子指数累计),结果表明,各因子潜在生态风险程度不一,局部镉、汞的较高,前者达到强,后者达到中等,而砷、铜、铅、铬、锌依次偏低,只达到轻微。从空间分布来看,重金属污染潜在生态风险程度以澳门东南最高,达到强这一等级。

Based on the recent survey data for the heavy metals m surficial Pearl River Estuary, their distribution and correlation characteristics are analyzed. There .are positive correlations between the heavy metals and organic matters, Eh and sediment gram, and negative correlations between the heavy metals and seawater salinity. According to Hakanson＇s method, the index of potential ecological risk for each heavy metal is also assessed. The results show that the risk indices are different from each other. Locally high Cd and Hg concentrates causes middle-strong risk level, but the indices of As, Cu, Cr and Zn are relatively low and the corresponding risk level is light.