Seasonal pollution characteristics of organic compounds in atmospheric fine particles in Beijing
Seasonal pollution characteristics of organic compounds in atmospheric fine particles in Beijing
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DOI：
10.1016/j.scitotenv.2005.05.044
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发表时间：
2006-04-15
影响因子：
9.8
通讯作者：
Tang, XY
中科院分区：
文献类型：
--
作者：
He, LY;Hu, M;Tang, XY
北京是一个快速发展的城市，空气污染问题严重而独特。有机物是北京细颗粒物中含量最丰富的部分，占总质量的30-50%，这表明其在大气污染治理中的关键作用。然而，北京颗粒有机物的详细化学表征从未报道过。本文采用GC/MS技术对北京市大气细颗粒物中的有机组分进行了研究。在2002-2003年夏季、秋季和冬季的25个PM2.5样品中，鉴定和定量了100多种有机化合物。烷烃、脂肪酸、二羧酸、多环芳烃和一些重要的示踪化合物（藿烷、左旋葡聚糖和甾体）是主要的成分，其浓度之和在夏、秋、冬季分别为502、1471和1403 ng m（-3）。不同的有机物呈现出明显不同的季节性特征，反映了其不同的主要排放源，如燃煤、生物质燃烧和烹饪排放。通过对这些有机物的丰度和来源的分析，揭示了北京市大气污染的季节特征。(C)2005 Elsevier B. V.保留所有权利。
Beijing is a rapidly developing city with severe and unique air pollution problems. Organic matter is the most abundant fraction in fine particles in Beijing, occupying 30-50% of the total mass, indicating its key role in air pollution control. However, detailed chemical characterization of particulate organic matter in Beijing has never been reported. In this study, fine particles in the urban atmosphere in Beijing were investigated for its organic components by GC/MS technique. Over 100 individual organic compounds were identified and quantified in 25 PM2.5 samples from the summer, autumn and winter of 2002-2003. Alkanes, fatty acids, dicarboxylic acids, polycyclic aromatic hydrocarbons and some important tracer compounds (hopanes, levoglucosan and steroids) were the major constituents with the sum of their concentrations of 502, 1471 and 1403 ng m(-3) in summer, autumn and winter, respectively. Different organic compounds presented apparently different seasonal characteristics, reflecting their different dominant emission sources, such as coal combustion, biomass burning and cooking emission. The abundance and origin of these organic compounds are discussed to reveal seasonal air pollution characteristics of Beijing. (C) 2005 Elsevier B.V. All rights reserved.