南水北调东线工程通水后东平湖水质评价

为了解南水北调东线工程全线通水后东平湖水质状况，于2015年6月（枯水期）采集了东平湖4个地表水样品和7个地下水样品，测定了其中As、Cd、Cr、Cu、F、Hg、Mn和Pb等8种元素的含量，采用综合污染指数法、综合水质评分法和健康风险评价模型评价了其水环境质量和健康风险，结果表明：地表水中重金属浓度多数满足地表水环境质量标准I类，其中Hg污染相对较重，地下水中重金属浓度多数满足地下水质量标准III类及以上，其中F和Mn污染相对较重；4个地表水采样点综合污染指数均小于1，表明其水质优良，地下水中3个采样点的综合水质评分小于2.5，水质良好，4个采样点的综合水质评分大于4.25，水质较差；地表水的平均健康风险为9.18×10-5a-1，地下水的平均健康风险为8.16×10-5a-1，均为III级中风险。

Assessment of Dongping Lake Water Quality after the East Route Water Delivery of South to North Project

In order to study the water quality of Dongping Lake after water delivery of the east route of South to North Project, 4 surface water samples and 7 ground water samples were collected in June 2015 (dry season), then the concentration of 8 elements (As, Cd, Cr, Cu, F, Hg, Mn and Pb) were analyzed, afterwards comprehensive pollution index, comprehensive water quality score and health risk assessment were applied to evaluate the quality and health risk of the aquatic environment. Results showed that most heavy metals in surface water satisfied standard I of Environmental quality standards for surface water with Hg having the most severe pollution and most heavy metals in ground water meet standard III or better of Quality standard for ground water with F and Mn revealing the most serious pollution. For surface water, comprehensive pollution index of 4 samples was all less than 1, meaning its excellent quality, while for ground water, comprehensive water quality score of 3 samples was less than 2.5, presenting its fine water quality while score of the other 4 samples was more than 4.25, showing its poor water quality. Average health risk of surface water and ground water was 9.18×10-5a-1 and 8.16×10-5a-1 respectively, which both obeyed to health risk standard III medium risk.