生态保护区域饮用水源地水质金属健康风险评价

摘要

The health risks of 27 kinds of metal elements from 7 drinking water sources in Chongqing ecological protection area were assessed.The concentrations of all the elements were below the limits from USEPA,WHO and national standard of drinking water quality (GB 5749-2006).The carcinogenic risks arranged in the order of Cr ＞ As ＞ Cd,all were below USEPA maximum acceptable risks.The non-carcinogenic risks were in sequential order of Sr ＞ Pb ＞ Mo ＞ Fe ＞ Cu ＞ Se ＞ Ag ＞ Ni ＞ Zn ＞ Mn,and ranged in 9.36 × 10-11 a-1 ～1.25 × 10-7 a-1 which were far below the limits from USEPA,ICRP and other authorities.Adult female had a high risk level of carcinogenic and non-carcinogenic than adult male,the total carcinogenic risk was two orders of magnitude more than the total non-carcinogenic risk,the total health risk were at the level of 10-5.%选择重庆市生态保护发展区域饮用水源地为研究对象,运用健康风险评价模型对其水质金属进行评价.结果表明:7个饮用水源地中27种金属元素均达到USEPA、WHO和《生活饮用水卫生标准》(GB 5749-2006)限值要求.饮用水源地中致癌健康风险从高到低依次为Cr＞As＞Cd,均低于USEPA最大可接受风险.非致癌金属的健康风险从高到低依次为Sr＞ Pb＞ Mo＞ Fe＞ Cu＞ Se＞ Ag＞ Ni＞ Zn＞ Mn,非致癌风险水平为9.36 ×10-11 a-1～1.25×10-7 a-1,远低于USEPA、ICRP等权威机构限值.成人致癌和非致癌健康风险水平均为女＞男,致癌总风险均大于非致癌总风险2个数量级以上,总健康风险均保持在10-5数量级水平.