丹江口库区蒿坪河水体中多环芳烃污染健康风险评价研究

Water environmental health risk assessment of PAHs in Haoping river in Danjiangkou reservoir area

为研究丹江口库区蒿坪河水体中多环芳烃对人体健康产生的潜在危害风险，分别于平水期（4月）和丰水期（9月）采集了丹江口水库二级支流蒿坪河水样，采用GC／MS对水体中EPA优先控制的16种PAHs进行了检测并分析．根据检测数据，运用水环境评价模型，对水体中主要多环芳烃组分污染进行了健康风险评价．结果表明，在所评价河流断面中，徐家岭和蒿坪桥污染比较严重，健康危害的风险相对较大．蒿坪河干流平水期5种多环芳烃组分由饮水途径所致健康危害的个人年总风险范围为1．40×10^-12～5．28×10^-12a^-1，平均个人年总风险为2．70×10^-12a^-1，丰水期个人年总风险范围为9．41×10^-14～6．37×10^-13a^-1，平均个人年总风险为4．49×10^-13a^-1，远低于国际辐射防护委员会（ICRP）推荐的最大可接受值（5．0×10^-5a^-1）．蒿坪河5种多环芳烃组分年总风险目前虽然还处于较低水平，但作为丹江口水库的水源之一．应引起足够重视．

Water samples of Haoping River, the second grade tributary of Danjiangkou reservoir, was collected in the normal water period （April） and the wet period （Sept.）, and the content of 16 kinds of PAHs were detected by GC - MS. Based on the data of PAHs pollution in the Haoping River, five kinds of predominant PAHs was chosed and human health risk assessment was done. In all of the 14 sampling sites, Xujialing and Haopingqiao were found to have a high health risk respectively. The health risk from PAHs by drinking for one person ranged from 1.40×10^-12 to 5.28×10^-12a^-1 in the normal water period, and ranged from 9.41×10^-14 to 6.37×10^-13a^-1 in the abundant water period. Both the health risk of PAHs in the normal and abundant water period were lower than the maximum tolerable value （5.0×10^-5a^-1） recommended by ICRP. Though the health risk from PAHs in Haoping River was low relatively, but as the main second grade tributary of Danjiangkou reservoir, the potential danger of PAHs pollution should be paid enough attention.