成都市饮用水源硝酸盐、亚硝酸盐健康风险评估

Health risk assessment of nitrate and nitrite in drinking water sources in Chengdu

选取11个成都市典型河流型饮用水源地作为研究对象,利用离子色谱法测试水中硝酸盐、亚硝酸盐的含量。采用美国环保署(USEPA)推荐的健康风险评价模型,评估了其对成人及儿童的健康风险程度。结果表明:所有水源地硝酸盐非致癌危害商数均小于1,且对成人及儿童风险程度较低。丰水期、枯水期分别有8、9个点位的亚硝酸盐非致癌危害商数大于1。丰水期、枯水期硝酸盐、亚硝酸盐个人年风险值均低于国际机构推荐的最大可接受风险值水平。

The distribution characteristics of nitrate and nitrite in 11 typical river type drinking waters in Chengdu were studied by ion chrommatography.The human health risk assessments of nitrate and nitrite in drinking water to adults and children were assessed by a model recommended by United States Environmental Protection Agency.The results indicated that the non carcinogenic hazard quotient of nitrate in all drinking water was less than 1.The human health risks of nitrate to adults and children were low.In wet season,eight drinking waters’non carcinogenic hazard quotient of nitrite were greater than 1.In dry season,nine drinking waters’non carcinogenic hazard quotient of nitrite were greater than 1.The health risk to the individual person per year in term of nitrate and nitrite in wet season,dry season were lower than the maximum acceptable risk value recommended by international institutions.