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首页> 外文期刊>Atmospheric research >Road tunnel, roadside, and urban background measurements of aliphatic compounds in size-segregated particulate matter
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Road tunnel, roadside, and urban background measurements of aliphatic compounds in size-segregated particulate matter

机译：尺寸分离的颗粒物中脂肪族化合物的道路隧道，路边和城市背景测量

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摘要

Particulate matter samples were collected in a road tunnel in Lisbon (PM0.5, PM0.5-1, PM1-2.5, and PM2.5-10) and at two urban locations representing roadside and background stations (PM2.5 and PM2.5-10). Samples were analysed for organic and elemental carbon (OC and EC), n-alkanes, n-alkenes, hopanes, some isoprenoid compounds, and steranes. Particulate matter concentrations in the tunnel were 17-31 times higher than at roadside in the vicinity, evidencing an aerosol origin almost exclusively in fresh vehicle emissions. PM0.5 in the tunnel comprised more than 60% and 80% of the total OC and EC mass in PM10, respectively. Concentrations of the different aliphatic groups of compounds in the tunnel were up to 89 times higher than at roadside and 143 times higher than at urban background. Based on the application of hopane-to-OC or hopanes-to-EC ratios obtained in the tunnel, it was found that vehicle emissions are the dominant contributor to carbonaceous particles in the city but do not represent the only source of these triterpenic compounds. Contrary to what has been observed in other studies, the Sigma hopane-to-EC ratios were higher in summer than in winter, suggesting that other factors (e.g. biomass burning, dust resuspension, and different fuels/engine technologies) prevail in relation to the photochemical decay of triterpenoid hydrocarbons from vehicle exhaust (C) 2015 Elsevier B.V. All rights reserved.
机译：在里斯本的公路隧道（PM0.5，PM0.5-1，PM1-2.5和PM2.5-10）以及代表路边和背景站的两个城市地点（PM2.5和PM2）收集了颗粒物样品。 5-10）。分析了样品中的有机碳和元素碳（OC和EC），正构烷烃，正构烯烃，hop烷，一些类异戊二烯化合物和甾烷。隧道中的颗粒物浓度比附近的路边高17-31倍，这证明了几乎全部是新鲜车辆排放的气溶胶起源。隧道中的PM0.5分别占PM10中总OC和EC质量的60％和80％以上。隧道中化合物的不同脂族基团的浓度分别比路边高89倍和比城市背景高143倍。根据在隧道中获得的hop烷/ OC或hop烷/ EC比率的应用，发现车辆排放是城市碳质颗粒的主要来源，但并非代表这些三萜化合物的唯一来源。与其他研究结果相反，夏季的西格玛hop烷/ EC比值高于冬季，这表明其他因素（例如，生物质燃烧，粉尘再悬浮以及不同的燃料/发动机技术）占主导地位。汽车尾气中三萜碳氢化合物的光化学降解（C）2015 Elsevier BV保留所有权利。

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  • 来源
    《Atmospheric research》 |2016年第2期|139-148|共10页
  • 作者

    Alves Celia A.; Oliveira Cesar; Martins Natercia; Mirante Fatima; Caseiro Alexandre; Pio Casimiro; Matos Manuel; Silva Hugo F.; Oliveira Cristina; Camoes Filomena;

  • 作者单位

    Univ Aveiro, Dept Environm, Ctr Environm & Marine Studies, P-3810193 Aveiro, Portugal;

    Univ Aveiro, Dept Environm, Ctr Environm & Marine Studies, P-3810193 Aveiro, Portugal|Univ Minho, Ctr Chem, Dept Chem, P-4710057 Braga, Portugal;

    Univ Aveiro, Dept Environm, Ctr Environm & Marine Studies, P-3810193 Aveiro, Portugal;

    Univ Aveiro, Dept Environm, Ctr Environm & Marine Studies, P-3810193 Aveiro, Portugal;

    Univ Aveiro, Dept Environm, Ctr Environm & Marine Studies, P-3810193 Aveiro, Portugal|Max Planck Inst Chem, D-55128 Mainz, Germany;

    Univ Aveiro, Dept Environm, Ctr Environm & Marine Studies, P-3810193 Aveiro, Portugal;

    Polytech Inst Lisbon, Lisbon Coll Engn, ISEL IPL, P-1959007 Lisbon, Portugal;

    Polytech Inst Lisbon, Lisbon Coll Engn, ISEL IPL, P-1959007 Lisbon, Portugal|Univ Lisbon, Fac Sci, Ctr Struct Chem CQE, P-1749016 Lisbon, Portugal;

    Univ Lisbon, Fac Sci, Ctr Struct Chem CQE, P-1749016 Lisbon, Portugal;

    Polytech Inst Lisbon, Lisbon Coll Engn, ISEL IPL, P-1959007 Lisbon, Portugal|Univ Lisbon, Fac Sci, Ctr Struct Chem CQE, P-1749016 Lisbon, Portugal;

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  • 正文语种 eng
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  • 关键词

    Size-segregated particles; Hopanes; Alkanes; Road tunnel; Roadside; Urban background;

    机译：尺寸分离的颗粒;烷;烷烃;道路隧道;路旁;城市背景;

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