2021年句容市饮用水中重金属健康风险评价

Health risk assessment of heavy metals in drinkingg water of Jurong City in 2021

目的评价句容市生活饮用水中重金属对人体健康产生的潜在危害。方法于2021年丰水期和枯水期对句容市饮用水中的重金属进行检测,并对饮水途径所引起的健康风险做出初步评价。结果句容市饮用水中砷(As)、镉(Cd)、六价铬(Cr^(6+))、铅(Pb)和汞(Hg)合格率均为100.0%。As、Cd、Cr^(6+)和Pb的致癌风险分别为2.8×10^(-5)/a、3.6×10^(-5)/a、5.0×10^(-5)/a、5.1×10-7/a,累积致癌风险为1.1×10^(-4)/a。不同人群致癌风险顺序为儿童>成人男性>成人女性;As、Cd、Cr^(6+)、Pb、Hg的非致癌风险值分别为6.3×10^(-2)/a、1.2×10^(-3)/a、2.0×10^(-2)/a、4.3×10^(-2)/a,8.2×10^(-3)/a,危害指数为1.3×10-1/a,不同人群非致癌风险顺序为儿童>成人男性>成人女性。结论句容市饮用水中As、Cd、Cr^(6+)、Pb浓度符合GB 5749—2006《生活饮用水卫生标准》,累积致癌风险较高,应在饮用水风险管理中加强关注,提高检测水平。As、Cd、Cr^(6+)、Pb、Hg的非致癌健康风险均在美国环境保护署可以接受的限值之内。

Objective To evaluate the potential health hazards of heavy metals in drinking water of Jurong City.Methods The heavy metals in drinking water of Jurong City were detected in the wet season and dry season in 2021,and the health risk caused by drinking water was evaluated preliminarily.Results The qualified rates of arsenic(As),cadmium(Cd),hexavalent chromium(Cr^(6+)),lead(Pb),and mercury(Hg)in drinking water in Jurong City were 100.0%.The carcinogenic risk of As,Cd,Cr^(6+)and Pb was 2.8×10^(-5)/a、3.6×10^(-5)/a、5.0×10^(-5)/a、5.1×10-7/a,respectively.The cumulative carcinogenic risk was 1.1×10^(-4)/a.Among dfferent population,the order of carcinogenic risk was children>adult males>adult females.The non-carcinogenic risk value of As,Cd,Cr^(6+),Pb and Hg was 0.063/a,0.012/a,0.020/a,0.043/a and 0.0083/a,respectively,and the hazard index was 0.13/a.The order of non-carcinogenic risk of different population was children>adult males>adult females.Conclusions The concentrations of As,Cd,Cr^(6+)and Pb in drinking water of Juirong City meet the hygiene standars of domestic drinking water according to CB 5749-2006,and the cumulative carcinogenic risk is high,so it is necessary to pay more attention to the risk management of drinking water and improve the detection level.The non-carcinogenic risks of As,Cd,Cr^(6+),Pb and Hg are within the range of acceptable risk value recommend by US EPA.