大沽排污河河口地区沉积物中重金属污染及其潜在生物毒性风险评价

本文以大沽排污河口表层沉积物为研究对象,分别运用ERL/ERM和生态危害指数两种评价方法对沉积物中6种重金属的潜在生物毒性风险进行评价,并对两种方法的评价结果进行对比。经均一化处理,重金属的含量均值由大到小的顺序排列为铬（168 mg/kg）〉锌（157 mg/kg）〉镍（60.7 mg/kg）〉铜（45.3 mg/kg）〉铅（7.31 mg/kg）〉镉（0.215 mg/kg）。经计算20个采样断面的沉积物中重金属毒性单位总和均在3~4之间,有80%的采样断面沉积物中重金属毒性单位总和大于3.5,毒性单位总和最大值为3.789。说明大沽排污河口沉积物中重金属的潜在生物毒性水平较低,可视为无生物毒性。

Heavy Metal Pollution in the Dagu Estuary Sediment and Potential Biological Toxicity Risk Assessment

Potential risks of biological toxicity of 6 heavy metals in the surface sediment from the Dagu Estuary was assessed with two evaluation methods： such as ERL/ERM and Ecological Risk Index.After the homogenization of samples,the mean levels of heavy metals in a descending order were as follows： Cr（168 mg/kg） Zn（157 mg/kg） Ni（60.7 mg/kg） Cu（45.3 mg/kg） Pb（7.31 mg/kg） Cd（0.215 mg/kg）.Based on the sediment analysis of 20 sample sections,the unit sum toxicity of heavy metals was between 3 and 4.The unit sum of heavy metal toxicity in the sediment of 80% sample sections was greater than 3.5,and the maximum value of the unit sum toxicity was 3.789.The level of potential biological toxicity of the Dagu Estuary sediment was low and could be considered to be non-toxic.