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首页> 外文期刊>Atmosphere >Characteristics of Organic and Elemental Carbon in PM2.5 and PM0.25 in Indoor and Outdoor Environments of a Middle School: Secondary Formation of Organic Carbon and Sources Identification
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Characteristics of Organic and Elemental Carbon in PM2.5 and PM0.25 in Indoor and Outdoor Environments of a Middle School: Secondary Formation of Organic Carbon and Sources Identification

机译：中学室内和室外环境中PM 2.5 和PM 0.25 中有机和元素碳的特征：有机碳的二次形成和来源识别

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Secondary organic carbon (SOC) formation and its effects on human health require better understanding in Chinese megacities characterized by a severe particulate pollution and robust economic reform. This study investigated organic carbon (OC) and elemental carbon (EC) in PM2.5 and PM0.25 collected 8–20 March 2012. Samples were collected inside and outside a classroom in a middle school at Xi’an. On average, OC and EC accounted for 20%–30% of the particulate matter (PM) mass concentration. By applying the EC-tracer method, SOC’s contribution to OC in both PM size fractions was demonstrated. The observed changes in SOC:OC ratios can be attributed to variations in the primary production processes, the photochemical reactions, the intensity of free radicals, and the meteorological conditions. Total carbon (TC) source apportionment by formula derivation showed that coal combustion, motor vehicle exhaust, and secondary formation were the major sources of carbonaceous aerosol. Coal combustion appeared to be the largest contributor to TC (50%), followed by motor vehicle exhaust (25%) and SOC (18%) in both size fractions.
机译：在以颗粒物污染严重和经济改革为特征的中国特大城市，需要更好地理解次生有机碳（SOC）的形成及其对人体健康的影响。这项研究调查了2012年3月8日至20日收集的PM 2.5 和PM 0.25 中的有机碳（OC）和元素碳（EC）。西安的一所中学。平均而言，OC和EC占颗粒物（PM）质量浓度的20％–30％。通过使用EC示踪剂方法，证明了在两个PM尺寸分数中SOC对OC的贡献。观察到的SOC：OC比率的变化可归因于主要生产过程，光化学反应，自由基强度和气象条件的变化。通过公式推导得出的总碳（TC）源分配表明，煤燃烧，机动车尾气和二次形成是碳质气溶胶的主要来源。燃煤似乎是TC的最大贡献者（50％），其次是汽车尾气（25％）和SOC（18％）。

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