湘江长沙综合枢纽工程库区9种痕量元素污染评价

Pollution Assessment of 9 Trace Elements in Xiang River Reservoir Area of Changsha

通过对2018年10月~2019年8月湘江长沙综合枢纽工程库区水体中的9种痕量元素的含量进行分析和污染现状评价,为研究区域的痕量元素污染防治提供技术支撑。结果表明在湘江长沙综合枢纽工程库区,9种痕量元素的含量浓度均符合国家地表水环境质量标准(GB3838-2002);从空间分布来看,铊、钼、锑、钒、镍、钡空间分布比较均衡,钴、硼、铍空间分布呈现无规则波动;从时间分布来看,汛期要优于非汛期,丰水期要优于枯水期。按内梅罗指数法进行评价,库区水体检测点样铊呈现无污染、轻微污染次数分别占总数的92.21%,7.79%,其它元素呈现无污染状态;尤其是较大降水以后或汛期容易出现铊污染的情况。

In this paper,the contents of 9 trace elements in the water body of the reservoir area of Xiang River Reservoir area of Changsha from October 2018 to August 2019 were analyzed and the pollution status was evaluated,it provides technical support for the prevention and control of trace element pollution in the study area.The results showed that the concentrations of 9 trace elements in the Xiang River Reservoir area of Changsha all meet the national standard for surface water quality(GB3838-2002),and the spatial distribution of thallium,Molybdenum,antimony,vanadium,nickel and Barium were relatively even,the spatial distribution of cobalt,Boron and beryllium showed irregular fluctuation.The temporal distribution showed that the flood season was better than the non-flood season and the wet season was better than the dry season.According to the nemerow index method,the thallium in the water samples of the reservoir area showed no pollution,the times of slight pollution accounted for 92.21%and 7.79%of the total respectively,and the other elements showed no pollution.Especially thallium pollution occured easily after heavy precipitation or flood season.