论文部分内容阅读
目的探讨老年人PM10个体暴露水平,解析其暴露来源。方法于2009年8—9月对天津某住宅区内80名老年人进行PM10个体暴露样品采集以及相应的室内外PM10浓度的监测及来源解析。结果 PM10个体暴露室内外环境OC/EC的比值均>2,说明个体暴露存在二次有机污染的可能;NO3-/SO42-比值均值相对较小(个体暴露为0.42,室内环境为0.51,室外环境为0.68),说明固定源是个体暴露的主要污染源;主成分分析共提取7个因子(源),分别是金属冶炼、机动车源和硝酸盐、燃烧源、土壤尘、工业源(主要是钢铁产业)、二次硫酸盐和室内再悬浮。结论金属冶炼、机动车源和硝酸盐、燃烧源是影响PM10个体暴露的主要来源。
Objective To investigate the individual exposure level of PM10 in the elderly and analyze the sources of exposure. Methods Eighty elderly people in a residential area in Tianjin from August to September in 2009 were collected for PM10 individual exposure samples and corresponding indoor and outdoor PM10 concentration monitoring and source analysis. Results The ratio of OC / EC in PM10 was> 2, indicating the possibility of secondary organic pollution. The average ratio of NO3- / SO42- was relatively small (0.42 for individuals and 0.51 for indoor environments) (0.68), indicating that the fixed source is the main source of individual exposure. Principal component analysis extracted seven factors (source), namely metal smelting, motor vehicles and nitrate, combustion sources, soil dust, industrial sources (mainly steel Industry), secondary sulphate and indoor resuspension. Conclusion Metal smelting, motor vehicle sources and nitrate, and combustion sources are the main sources of PM10 exposure.