资江干流市级饮用水源中重金属健康风险评价

Health Risk Assessment of Heavy Metals in Municipal Drinking Water Sources Along the Main Stream of Zijiang River

对2015~2019年资江干流市级饮用水中重金属进行了检测,并用水环境健康风险评价模型对其通过饮水途径所引起的健康风险作出了评价。结果表明:桂花渡水厂、工业街水厂和城西水厂3个水源地水体中致癌物As的风险值均低于国际放射防护委员会(ICRP)的推荐值;龙山港水源地水体中的致癌物六价Cr、As、Cd风险等级从高到低依次为六价Cr、As、Cd;六价Cr的健康风险值高于ICRP的推荐值。桂花渡水厂、工业街水厂、城西水厂和龙山港水体中非致癌物质通过饮用水途径产生的健康风险分别表现为:Sb>Mn>Pb>Fe>Cu>Tl、Sb>Pb>Mn>Fe>Cu>Tl、Sb>Cu>Mn>Pb>Fe>Tl和Sb>Fe>Cu>Pb,风险值为10-9a-1,均低于ICRP推荐的标准限值。

The concentrations for ten kinds of heavy metals in the three drinking water sources along the main stream of Zijiang river from 2015 to 2019 years were measured.And preliminary health risk assessments for the ten kinds of heavy metals in the four drinking water sources were conducted by using the health risk assessment model recommended by USEPA.The results showed that among the three drinking water sources of Guihuadu Waterworks,Gongye Street Waterworks and Chengxi Waterworks,the range of health risk level caused by As was lower than the maximum allowance levels recommended by ICRP.The ranking of the health risks on drinking water in Longshan port was Cr 6+>As>Cd.The range of health risk level caused by Cr 6+was higher than the maximum allowance levels recommended by ICRP.Among the health effect of non-carcinogenic heavy metals in drinking water,the ranking of the health risks by the way of drinking water in Guihuadu Waterworks,Gongye Street Waterworks,Chengxi Waterworks and Longshan port were Sb>Mn>Pb>Fe>Cu>Tl,Sb>Pb>Mn>Fe>Cu>Tl,Sb>Cu>Mn>Pb>Fe>Tl and Sb>Fe>Cu>Pb,and the health risk levels were 10-9 a-1,which was lower than the maximum allowance levels recommended by ICRP.