重庆秀山县城市饮用水水质特征及健康风险评价

Characteristics of Urban Drinking Water Quality and Health Risk Assessment in Xiushan County of Chongqing

以重庆市秀山县城市集中式饮用水水源地为研究对象,选取2011—2015年的水质监测结果,采用单因子污染指数法和健康风险评价模型对水质指标进行分析评估。结果表明:钟灵水库水质各项研究指标均满足《地表水环境质量标准》(GB 3838—2002)中Ⅲ类水质标准要求,水质状况良好。研究指标的污染指数均小于1,其中Mn的污染指数最大。水体中致癌物的致癌风险水平为1.27×10^(-9)~1.37×10^(-6)a^(-1),成人和儿童总健康风险分别为0.19×10^(-6)~0.43×10^(-6)a^(-1)和0.61×10^(-6)~1.43×10^(-6)a^(-1),成人和儿童总健康风险均低于ICRP的最大可接受风险水平(5×10^(-5)a^(-1))1~2个数量级。

This paper researches into the urban centralized source of drinking water in Xiushan county,Chongqing,and the water quality monitoring results there from 2011 to 2015 are selected as the object of study. The single factor pollution index method and health risk assessment model are used to analyze the water quality. The results show that all the indexes of Zhongling water reservoir achieved class Ⅲwater quality standards in the surface water environment quality standard（ GB 3838-2002） which shows that the water quality was in good condition. Among the results,all the pollution indexes were below 1,with Mn dyeing index as the largest. The level of the carcinogenic risk was 1. 27 × 10-9 1. 37 × 10（-6）a（-1）. The level of total health risks of adults and children were 0. 19 × 10（-6） 0. 43 × 10（-6）a（-1）,and0. 61 × 10（-6） 1. 43 × 10（-6）a（-1）respectively,both of which were 1 to 2 orders of magnitude below ICRP＇s maximum acceptable risk level（ 5 × 10-5a（-1））.