东平湖枯丰水期水质健康风险评价

东平湖是重要的饮用水源地,也是南水北调东线工程的最后一级调蓄水库,评价其水质安全极为重要。在南水北调东线工程试通水后,于2015年6月枯水期及9月丰水期分别采集东平湖6个采样点的地表水水样,分析SD、TP、TN、COD_(Mn)、Cd、As、Cr~(6+)、NH_4~+、F~-、Hg、Pb等11项水质指标,并采用综合营养状态指数法、内梅罗指数法和健康风险评价模型评价东平湖水质状况。结果表明,东平湖整体呈中营养至富营养状态,枯水期水质污染严重,丰水期水质相对清洁,健康风险呈中至高风险状态,主要污染物为N、P、Hg、As等,可能与湖区的农业面源污染有关。研究结果可为东平湖水污染防治及南水北调东线工程的安全运行提供参考。

Water Quality Health Risk Assessment of Dongping Lake in Dry and Wet Seasons

As Dongping Lake is an important drinking water source as well as the last regulating reservoir of the South-to-North Water Transfer Project, it is extremely important to evaluate its water quality safety. After delivery of eastern route of South-to-North Water Transfer Project, samples were fetched from Dongping Lake in June (dry season) and September 2015 (wet season) at 6 sampling sites and concentrations of SD, TP, TN, CODMn, Cd, As, Cr6+, NH+4, F-,Hg and Pb were determined. Afterwards, comprehensive nutrition state index, Nemerow index and health risk assessment model were employed to evaluate the water quality of Dongping Lake. Results revealed that the nutritional status of Dongping Lake is middle to rich nutrition, water quality is heavy-polluted in dry season and relatively clean in wet season, and the overall health risk is medium to high level. Main pollutants of Dongping Lake are N, P, Hg and As, which may origin from agricultural non-point source pollution. The research results can provide reference for Dongping Lake pollution control and the safe operation of the East Route of the South-to-North Water Transfer Project.