浑河上游段不同时期水体重金属健康风险评价

Health risk of heavy metals in water body during different stages from upper reach of hunhe river upstream

以浑河上游段为研究区,分析了水体中Zn、As、Cu、Pb、Hg、Cr和Cd的含量水平,评价了经饮水途径所致的健康风险。结果表明,水体主要污染物是Hg,主要污染断面为浑河闸;Cd在5月和7月均超过地表水Ⅴ类标准,10月份均符合Ⅲ类标准或更优,其余采集的所有采样点水体中Zn、Cu、As、Pb和Cr均符合国家地表水Ⅳ类标准或更优;7种重金属在大部分采样点均呈现5和7月高于10月份特征。总健康风险水平主要集中在10^(-3)～10^(-2)/a水平,高于ICRP推荐的最大可接受风险水平5.00×10^(-5)/a,且呈现5月>10月>7月的特征。非致癌有毒化学物质Zn、Cu、Pb和Hg由饮入途径所引起的健康风险值集中在1.21×10^(-11)～3.48×10^(-7)/a,低于最大可接受风险水平,且呈现Hg>Pb>Cu>Zn的特征;化学致癌物质Cr和Cd引起的健康风险值集中在9.36×10^(-5)～1.12×10^(-3)/a,高于最大可接受风险水平,占总风险的主导地位。

Hunhe River upstream was selected as the study area,the contents levels of Zn,As,Cu,Pb,Hg,Cr,and Cd in the water were analyzed,and the health risks that caused by drinking water were evaluated.The results showed that the main pollutant in the water is Hg,and the main pollution section is the Hunhe River Gate;the content of Cd in the water exceeds the surface water gradeⅤstandards in May and July,and meets theⅢ standard or better in October,and all the other collected Zn,Cu,As,Pb,and Cr at the sampling point were all in accordance with national standards for surface water Ⅳ or better.In most sampling sites,the contents of the 7kinds of heavy metals t in May and July were higher than those in October.The total health risk of metals mainly concentrated in 10^-3~10^-2/a level,which is higher than the maximum acceptable risk level of ICRP recommended(5.00×10^-5/a),and presents the characteristics of May>October>July.Non-carcinogenic,toxic chemical substances Zn,Cu,Pb,and Hg cause health risks arising from inhalation routes concentrated in 1.21×10^-11~3.48×10^-7/a level,which is below the maximum acceptable risk level,and risk value from high to low was Hg>Pb>Cu>Zn.chemical and carcinogenic Cr and Cd caused health risk values concentrated in 9.36×10^-5~1.12×10^-3/a,higher than the maximum acceptable risk level,accounting for the leading position of total risk.