衡阳市大气降尘中重金属污染特征及风险评价

Heavy Metal Pollution Characteristics and Risk Assessment of Atmospheric Dust in Hengyang City

利用2015—2017年衡阳市城区大气降尘中砷、镉、铅的监测数据,采用地累积指数法、潜在生态危害指数法、健康风险评价法对3种重金属的污染特征及风险进行了评价。结果表明:地累积指数法评价污染程度表现为镉>铅>砷;潜在生态危害程度表现为镉>铅>砷,镉均为极强生态危害程度,铅以轻微及中等生态危害程度为主,砷以轻微生态危害程度为主;非致癌风险指数大小顺序为砷>铅>镉,砷、镉的致癌风险指数远低于非致癌风险指数,砷的致癌风险指数大于镉。

Based on the monitoring data of As,Cd and Pb in urban atmospheric dust in Heng-yang City from 2015 to 2017,the pollution characteristics and risks of three heavy metals were evaluated by the methods of ground accumulation index,potential ecological hazard index and health risk assessment.The results showed that the pollution degree was Cd>Pb>As,and the potential ecological hazard degree was Cd>Pb>As.Cd was a very strong ecological hazard degree.Pb was mainly slight and moderate ecological hazard degree,and As was mainly slight ecological hazard degree.The order of non-carcinogenic risk index was As>Pb>Cd.The carcinogenic risk index of arsenic and cadmium is much lower than that of non-carcinogenic risk index,and the carcinogenic risk index of arsenic is higher than that of Cd.