南水北调东线工程通水后沿线湖泊水质评价

Water Quality Assessment of Dongping Lake along the East Route since the South-to-north Water Diversion Project Put into Use

为了解南水北调东线工程通水后沿线湖泊水质状况,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^(-5)a^(-1),地下水的平均健康风险为8.16×10^(-5)a^(-1),均为III级中风险。

In order to study the water quality of Dongping Lake along the east route after the South-to- north water diversion project, 4 surface water samples and 7 ground water samples were collected in June 2015 （dry season）, the concentrations of 8 elements （As, Cd, Cr, Cu, F, Hg, Mn and Pb） were ana- lyzed, and then comprehensive pollution index, comprehensive water quality score and health risk assess- ment were applied to evaluate the quality and health risk of the aquatic environment. Results showed that most heavy metals in surface water meet standard I of Environmental quality standards for surface water , and Hg with the most severe pollution. Then most heavy metals in ground water meet or are above stand- ard III of Quality standard for ground water with F and Mn revealing the most serious pollution. For sur- face water, comprehensive pollution index of all 4 samples was less than 1, meaning its excellent quality. 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. Aver- age health risk of surface water and ground water was 9. 18 × 10^-5a^-l and 8.16 × 10^-5a^-1 respectively, both of them are ascribed to the medium health risk standard III.