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. |