中文摘要：

为了解东平湖水环境中污染物的分布特征、来源及健康风险,于2010年12月（冬季）环湖均匀采集了33个表层水样,分析了其N、P营养盐和Hg、As的质量浓度,并应用健康风险评价模型进行初步评价。结果表明,以《地表水环境质量标准》（GB 3838—2002）Ⅲ类水标准值为评价标准,总P和Hg质量浓度的超标率分别为30.3%和48.4%。湖东区、东南区总P质量浓度较高,可能是由于大汶河的输入和底泥的二次释放;沿湖四周Hg质量浓度高于湖心区,这可能与库区燃煤和垃圾焚烧有关。As通过饮水途径产生的致癌风险平均值为2.18×10-6 a-1,高于美国国家环保局（US EPA）推荐的1.0×10-6 a-1的最大可接受风险水平,超标率为77.4%;而非致癌物Hg、NH4＋-N和NO3--N的健康风险等级为10-12~10-9 a-1。研究表明,东平湖水环境中致癌物As的健康风险值远大于非致癌物质,建议对As作进一步的溯源调查。

英文摘要：

The present paper is concerned about our investigation and analysis of the concentrations of the total 33 surface water samples collected uniformly around the water-coming sources of Dongping Lake in December, 2010. For our research purpose, we have done preliminary health risk assessment involved with the pollutants for drinking water by using the models of US EPA. The results of our preliminary assessment show that the concentrations of the total phosphorus and mercury exceed 30.3% and 48.4% of the contrast samples of type III standard values of the GB 3838—2002 National Environmental Quality Standards for Surface Water respectively, whereas pH value , the concentrations of DO, NH4＋-N and As stay below the above-said standards. To be more exact, we have found the total phosphorus much higher than normal in the east and southeast areas of the lake, which implies that the sources of total phosphorus are likely to originate from Dawen River, the unique river merging into the lake from its southeastern side as well as the secondary release of phosphorus from the lake deposits. As to mercury, its concentrations were detected on the whole higher surrounding the lake than in its central area, which may account for the coal burning and garbage incineration in the villages around the lake. In addition, the individual carcinogenic risk value is likely to be caused by As through drinking water at the rate of 9.08×10-8-4.28×10-6 a-1 with an average of 2.18×10-6 a-1, higher than 1.0×10-6 a-1 of the up-limit tolerate level recommended by US EPA but lower than the standard 5.0×10-5 a-1 recommended by ICRP. It is particularly necessary to stress that the ratio of the samples with carcinogenic risk caused by As is also 77.4% above the standard 1.0×10-6 a-1, the maximum risk found in the sample collected near the inlet of Dawen River. Moreover, the non-carcinogens discovered stand in the order of Hg （3.07×10-10 a-1）〉NO3--N （1.39×10-10 a-1）〉NH4＋-N （7.07×10-11 a-1） and the total risk was 1.38×10-10-