青海省某工业园区大气PM_(2.5)特征重金属健康风险评价

Health Risk Assessment of Heavy Metals in Atmospheric PM_(2.5) in an Industrial Park in Qinghai Province

以青海省某工业园区大气PM_(2.5)为研究对象,分析了样品中重金属(包括Cr、Pb和类重金属As)含量分布,应用US EPA的RAGS风险评估模型,对大气PM_(2.5)中重金属人体健康风险进行评价。结果表明,铅在10∶00~12∶00点处于浓度较高时段峰值,铬在3∶00~10∶00点处于浓度较高时段,砷在10∶00~12∶00点处于浓度较高时段。铅、铬波动情况较为频繁,可能与当地企业生产工艺、工况有关,砷(As)的风险值处于注意级别,可接受风险,管理人员需要密切注意;而铬(Cr)处于警告级别,管理人员需要采取措施进行改进。铅(Pb)为非致癌物,风险值小于1处于可控级别。

Taking the atmospheric PM2.5 in an industrial park in Qinghai as the research object, the concentrations of heavy metals（including Cr, Pb and kind of heavy metal As） in samples was analyzed, The health risks of heavy metals in atmospheric PM2.5 were evaluated using RAGS risk assessment model. The results showed that concentration of lead peaked at 10 am-12 am, and concentration of chromium was at a higher value at 3 am-10 am, and concentration of arsenic was higher at 10 am-12 am. Lead and chromium fluctuations were more frequent and may be related to the production process and working conditions of local enterprises. The risk value of arsenic（As）was at the attention level, acceptable risk, and the managers need to pay close attention. Chromium(Cr） is at the warning level, and managers need to take steps to improve. Lead（Pb） was a non-carcinogen, and the risk value is less than 1.