珠江鸡啼门口海湾沉积物重金属环境质量评价

Environmental Quality of Sediment Heavy Metals in Jitimen Estuarine Bay of Pearl River

根据2012年对珠江鸡啼门口海湾表层沉积物重金属Hg、As、Cu、Pb、Cd、Zn、Cr和粒度的调查分析显示,本区以粗的砂质沉积为主,不易蓄积污染物,因此重金属含量较低,甚至低于当地背景值和邻近的区域。标准指数法、潜在生态危害指数法、地累积指数法的评价分析结果显示,本区总体属于安全、低污染和低生态危害风险。不同评价方法因侧重点不同,各参评因子的评价结论略有不同,但总体表现为As和Cd所潜在的污染和生态危害风险较其它因子略高,而Cr则相对较低。

Based on the survey data of the surface sediments in the Jitimen estuarine of Pearl River in June 2012, the heavy metals Hg, As, Cu, Pb, Cd, Zn, Cr, and grainsizer were analyzed. Sandy sediments is the main constituent, it is less likely to accumulate pollutants, so it has lower heavy metal contents than the local background values and adjacent areas averages. Evaluated through standard index, potential ecological risk index and geo-accumulation index, the sediments environment is safe, low pollution and low ecological hazard. The conclusions may be slightly different because of the evaluation methods and involved factors various, but overall, the evaluation index of As and Cd is higher than the other factors, while the evaluation index of Cr is lower. The above description of As and Cd exists in potential pollution or ecological risk.