郑州市饮用水源水中砷含量检测及健康风险评价

Detection and Health Risk Assessment of Arsenic Content of Source Water in Zhengzhou

为了了解郑州市饮用水源水的砷污染情况,应用原子荧光法对2012年—2014年水源水中的砷含量进行检测。结果表明,6个采样点的砷含量均小于地表水Ⅰ类标准限值(0.05 mg/L),其中5个采样点的砷含量小于《生活饮用水卫生标准》(GB 5749—2006)的限值(0.01 mg/L),另外1个采样点的砷含量大部分超过了GB 5749—2006的限值,2012年—2014年的超标率分别为41.7%、66.7%、83%。对2014年地下水与自来水中的砷进行健康风险评价,结果显示,砷的致癌风险值虽然已经超过美国EPA建议值,但砷含量低于GB 5749—2006限值,不会对人群产生致癌毒害。

To know the pollution and health risk of trace arsenic in source water in Zhengzhou City, trace arsenic in source water was determined using atomic fluorescence spectrometry. Arsenic levels of six sample points were less than the first-class standard value as required by Environment Quality Standards for Surface Water （GB 3838 -2002）. Moreover, the arsenic content of five sample points were lower than the limit value in Standards for Drinking Water Quality （GB 5749 -2006）. However, the arsenic content of the other sample points was considerably more than the limit value of Standards for Drinking Water Quality （GB 5749 -2006）, and arsenic contents during the 2012 -2014 period exceeded the standard value by 41.7%, 66.7% and 83%, respectively. The health risks of trace arsenic in tap water and underground water in 2014 were also evaluated. The results showed that the cancerous risk indexes exceeded the acceptable levels recommended by US EPA, but arsenic contents were lower than that required by GB 5749 -2006, indicating that the arsenic levels had no carcinogenic toxicity on people.