河西走廊中段某地区地下水污染的健康风险评价

Health Risk Assessment of the Groundwater Pollution of a Region in the Middle of Hexi Corridor

为了研究河西走廊中段某地区工农业生产对地下水的污染状况和保障人民生活用水安全,本文依据该地区地下水的水质监测资料,利用美国环保局推荐的健康风险评价模型对该地区地下水中污染物所引起的健康风险进行了计算与评价。结果表明:研究区地下水中污染物对人体产生的非致癌风险中,各监测点污染物的非致癌危害指数均未超过美国环保局推荐的控制标准1,说明这些污染物不会对人体健康造成危害;而部分区域六价铬的致癌风险值超过了美国环保局推荐的评价标准(10-6),说明该地区应加强对六价铬污染的防范治理,以确定人民生活的饮水安全。

For the purpose of studying groundwater pollution caused by industrial and agricultural production and protecting the safety of people＇s living water in the middle of Hexi Corridor,this paper assesses the health risk of the groundwater pollution of a region in the middle of Hexi Corridor by using the model of U. S. Environmental Protection Agency and the monitoring data of groundwater quality in the region. The results show that the non-carcinogenic risk indexes of all pollutants do not exceed the acceptable range;the carcinogenic risks of hexavalent chromium in some areas are higher than those of the assessment standard recommended by U. S. EPA（10^- 6） ,which im plies that in this region the government should give priority to the prevention and governance of hexavalent chromium pollution to ensure the safety of people＇s drinking water.