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首页> 外文期刊>Environmental Science & Technology >Roadside, Urban, and Rural Comparison of Primary and Secondary Organic Molecular Markers in Ambient PM2.5
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Roadside, Urban, and Rural Comparison of Primary and Secondary Organic Molecular Markers in Ambient PM2.5

机译:PM2.5环境中主要和次要有机分子标记物的路边,城乡比较

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摘要

PM_(25) filter samples (12-h and 24-h) were collected in urban Atlanta, GA, next to a freeway and 400 m away, as well as at a rural site, with particular focus on exploring on-road emissions, regional transport, and biogenic effects. Detailed speciation of PM_(25) carbonaceous aerosols was conducted by GC/ MS. Diurnal, seasonal, and spatial variations of PM_(25) organic composition were investigated. Primary organic compounds usually exhibit different attributes of day vs night while secondary organic tracers varied little. Much higher concentrations of automotive-related primary organic compounds are observed at the highway site, including n-alkanes, hopanes, steranes, and polycyclic aromatic hydrocarbons (PAHs). Season-specific on-road mobile source primary OC profiles were developed by using differences in organic species concentrations between the highway site and the nearby site. Calculated on-road source profiles differ from mobile source profiles measured in the lab. Significant seasonal differences are observed for 2-methyltetrols, cis-pinonic acid, and pinic acid, organic tracers of biogenic secondary organic aerosols (SOA). Little correlation is found between 2-methyltetrols and c/s-pinonic or pinic acid, though cis-pinonic and pinic acids are strongly correlated.
机译:PM_(25)过滤器样品(12-h和24-h)是在佐治亚州亚特兰大市区,400 m处的高速公路旁以及乡村地区采集的,特别是在探索道路排放时,区域运输和生物成因。通过GC / MS对PM_(25)碳质气溶胶进行了详细的形态分析。研究了PM_(25)有机组成的昼夜,季节和空间变化。初级有机化合物通常表现出白天和黑夜的不同属性,而次级有机示踪剂变化不大。在高速公路现场观察到更高浓度的汽车相关主要有机化合物,包括正构烷烃,hop烷,甾烷和多环芳烃(PAH)。通过使用高速公路站点和附近站点之间有机物种浓度的差异,开发了特定季节的道路移动源主要OC配置文件。计算出的道路源配置文件与实验室中测量的移动源配置文件不同。观察到了明显的季节性差异,其中包括2-甲基四醇,顺式品酸和品酸,这是生物成因的有机有机气溶胶(SOA)的有机示踪剂。尽管顺式-品酸和松酸是高度相关的,但是2-甲基四醇和c / s-品酸或松酸之间几乎没有相关性。

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  • 来源
    《Environmental Science & Technology》 |2009年第12期|4287-4293|共7页
  • 作者单位

    School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, Georgia 30332;

    School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, Georgia 30332;

    School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332;

    State Key Laboratory of Organic Geochemistry, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China;

    School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, Georgia 30332 Currently at Department of Atmospheric Science, Colorado State University, Fort Collins, Colorado 80523;

    School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, Georgia 30332;

    School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332;

    Atmospheric Research & Analysis, Inc., Cary, North Carolina 27513;

    School of Civil and Environmental Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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