宿州市农村地下水重金属含量与健康风险评价

对宿州市农村地下水重金属含量进行检测,并采用美国环保署(United States Environment Protection Agency,USEPA)推荐的评价模型开展了重金属健康风险评价。检测结果表明部分地下水已不宜被直接饮用,特别是近郊的农村地下水。健康风险评价结果表明,化学致癌物的所致健康风险值远高于化学非致癌物,后者经饮用水途径产生的健康风险均处于可忽略水平。化学致癌物Cr、Cd所致健康风险均值分别为1.24×10-6、1.34×10-5a-1,占总健康风险值的比例分别为89.52%和10.45%,说明宿州市农村地下水中Cr和Cd具有一定的致癌风险,应作为优先污染物予以重视。

Concentrations and health risk assessment of heavy metals in groundwater in rural areas of Suzhou City

The concentrations of heavy metals(HMs)in groundwater in rural areas of Suzhou City were examined, and the health risks of the HMs were assessed using the risk assessment model recommended by the United States Environment Protection Agency(USEPA). The results show that the groundwater was not suitable for drinking, especially in the rural areas in the suburbs. The results of the health risk assessment show that the health risk caused by chemical carcinogens was far higher than that caused by chemical non-carcinogens, and the health risk caused by the latter through diffusion of potable water could be neglected. The mean values of health risks of Cr and Cd were 1. 24×10^-6 and 1. 34×10^-5 per year, respectively, accounting for 89. 52% and 10. 45% of the total health risk, indicating that Cr and Cd in groundwater in the study area generate a high carcinogenic risk, and these two HMs, regarded as priority pollutants, should be paid much attention.