摘要
为研究巢湖水环境重金属污染程度及分配特征,在丰水期采集了全湖水体和沉积物样品,分析了Cr、Co、Ni、Cu、Zn、As、Cd、Pb及Hg的含量、赋存形态及分配特征.结果表明,巢湖水体的重金属浓度较低,满足《地表水环境质量标准》(GB 3838-2002)中的最严限值要求;沉积物Cd和Hg的超标倍数最高,在西湖区的含量远高于其他湖区,以生物有效态为主;各元素在沉积物-水体中的分配系数空间差异性不大,As的分配系数最低.巢湖重金属治理应更关注西湖区沉积物中Cd和Hg的累积污染.
Abstract
To study the degree and distribution characteristics of heavy metal pollution in the water environment of Chaohu lake,water and sediment samples were collected throughout the lake during the wet season.The content,occurrence forms,and distribution characteristics of Cr,Co,Ni,Cu,Zn,As,Cd,Pb,and Hg were analyzed.The results indicate that the concentration of heavy metals in the water of Chaohu lake is relatively low,meeting the strictest limit requirements in the"Environmental Quality Standards for Surface Water"(GB 3838-2002).The exceedance multiples of Cd and Hg in sediments are the highest,with much higher levels in the West Lake area than in other lake areas,mainly in the form of bioavailable substances.The spatial differences in the distribution coefficients of various elements in sediment water bodies are not significant,with As having the lowest distribution coefficient.The remediation of heavy metals in Chaohu lake should pay more attention to the cumulative pollution of Cd and Hg in sediments of Xihu district.
维普
万方数据