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Characteristics of atmospheric intermediate volatility organic compounds (IVOCs) in winter and summer under different air pollution levels

机译：不同空气污染水平下冬季和夏季大气中间挥发性有机化合物（IVOCs）的特征

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摘要

Intermediate volatility organic compounds (IVOCs) in outdoor air have been reported in recent years with focus on characterizing IVOCs and their contributions to the formation of secondary organic aerosol (SOA). Little has been studied on the different behaviors of IVOCs in particulate matter (PM) dominated winter pollution weather and ozone (O-3) dominated summer pollution weather. In this study, we collected and analyzed outdoor airborne IVOCs in an urban location in Shanghai during PM dominated pollution events in winter (ten samples) and O-3 dominated pollution events in summer (22 samples). IVOCs were categorized into n-alkanes, polycyclic aromatic hydrocarbons (PAHs) and unspeciated complex mixture (UCM) that includes unspeciated branched alkanes (b-alkanes) and other unidentified IVOCs. In winter samples total IVOCs concentrations were up to 114 mu g/m(3) and UCM IVOCs accounted for 91% +/- 3%, while in summer samples total IVOCs concentrations were only up to 17.2 mu g/m(3) and UCM accounted for 69% +/- 14%. The average concentration of primary IVOCs which are directly from emission sources, was 35.1 +/- 16.1 mu g/m(3) and 4.0 +/- 2.2 mu g/m(3) in winter and summer, respectively. IVOCs were found to have statistically significant positive correlations with PM (PM2.5, PM10) but not with O-3 in both winter and summer samples. Statistically significantly inverse relationships between O-3 and C-12-C-14 n-alkanes and between O-3 and two to three rings PAHs in summer samples were observed, indicating that these relatively more volatile IVOCs might be actively involved in atmospheric photochemical reactions in the atmosphere in summer. Our study revealed different behaviors of IVOCs in winter and summer pollution events in Shanghai; however, more research is needed to better understand the contribution of IVOCs to SOA, and the underlying photochemical reactions of IVOCs during O-3 dominated air pollution events.
机译：近年来，近年来户外空气中的中间挥发性有机化合物（Ivocs），重点是表征IVOCs及其对次级有机气溶胶（SOA）形成的贡献。少量研究了颗粒物质（PM）占据冬季污染天气和臭氧（O-3）占据夏季污染天气的不同行为。在这项研究中，我们在冬季（十个样本）和O-3占据了夏季举行的污染事件（10个样品）和O-3主导的污染事件（22个样本）中在上海收集和分析了上海市地区的户外空中Ivocs。将Ivocs分为N-烷烃，多环芳烃（PAH）和未设定的复杂混合物（UCM），其包括未设定的支链烷烃（B-烷烃）和其他未识别的IVOC。在冬季样品中，总IVOCs浓度高达114μg/ m（3），UCM IVOCs占91％+/- 3％，而在夏季样品中，总IVOCs浓度仅高达17.2μg/ m（3）和UCM占69％+/- 14％。直接来自排放源的原发性IVOC的平均浓度分别在冬季和夏季分别为35.1 +/-16.1μg/ m（3）和4.0 +/-2.2μg/ m（3）。发现IVOCs与PM（PM2.5，PM10）具有统计学上显着的正相关，但在冬季和夏季样品中没有O-3。观察到夏季样品中O-3和C-12-C-14 N-烷烃和O-3和两到三个环PAH的统计学上显着逆关系，表明这些相对较高的挥发性IVOC可以积极参与大气的光化学夏天在大气中的反应。我们的研究揭示了上海冬季污染事件中Ivocs的不同行为;然而，需要更多的研究来更好地了解IVOCS对SOA的贡献，以及IVOC在O-3主导的空气污染事件中的潜在光化学反应。

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  • 来源
    《Atmospheric environment》 |2019年第8期|58-65|共8页
  • 作者

    Li Yingjie; Ren Bainian; Qiao Zhe; Zhu Jiping; Wang Hongli; Zhou Min; Qiao Liping; Lou Shengrong; Jing Shengao; Huang Cheng; Tao Shikang; Rao Pinhua; Li Jie;

  • 作者单位

    Shanghai Acad Environm Sci State Environm Protect Key Lab Cause & Prevent Ur Shanghai 200233 Peoples R China;

    Shanghai Acad Environm Sci State Environm Protect Key Lab Cause & Prevent Ur Shanghai 200233 Peoples R China|Shanghai Univ Engn Sci Coll Chem & Chem Engn Shanghai 201620 Peoples R China;

    Shanghai Acad Environm Sci State Environm Protect Key Lab Cause & Prevent Ur Shanghai 200233 Peoples R China|Shanghai Univ Engn Sci Coll Chem & Chem Engn Shanghai 201620 Peoples R China;

    Hlth Canada Environm Hlth Sci & Res Bur Exposure & Biomonitoring Div Ottawa ON K1A 0K9 Canada;

    Shanghai Acad Environm Sci State Environm Protect Key Lab Cause & Prevent Ur Shanghai 200233 Peoples R China;

    Shanghai Acad Environm Sci State Environm Protect Key Lab Cause & Prevent Ur Shanghai 200233 Peoples R China;

    Shanghai Acad Environm Sci State Environm Protect Key Lab Cause & Prevent Ur Shanghai 200233 Peoples R China;

    Shanghai Acad Environm Sci State Environm Protect Key Lab Cause & Prevent Ur Shanghai 200233 Peoples R China;

    Shanghai Acad Environm Sci State Environm Protect Key Lab Cause & Prevent Ur Shanghai 200233 Peoples R China;

    Shanghai Acad Environm Sci State Environm Protect Key Lab Cause & Prevent Ur Shanghai 200233 Peoples R China;

    Shanghai Acad Environm Sci State Environm Protect Key Lab Cause & Prevent Ur Shanghai 200233 Peoples R China;

    Hlth Canada Environm Hlth Sci & Res Bur Exposure & Biomonitoring Div Ottawa ON K1A 0K9 Canada;

    China Univ Min & Technol Sch Environm Sci & Spatial Informat Xuzhou 221116 Jiangsu Peoples R China;

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  • 正文语种 eng
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  • 关键词

    Intermediate volatile organic compounds (IVOCs); Unsolved complex mixture (UCM); Alkanes; Polycyclic aromatic hydrocarbons (PAHs); Secondary organic aerosols (SOA); Ozone (O-3);

    机译：中间挥发性有机化合物（IVOC）;未解脱的复合混合物（UCM）;烷烃;多环芳烃（PAH）;二次有机气溶胶（SOA）;臭氧（O-3）;

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