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Airborne ultrafine particles in a naturally ventilated metro station: Dominant sources and mixing state determined by particle size distribution and volatility measurements

机译:自然通风的地铁站中的空气传播超细颗粒:主要来源和混合状态,取决于粒径分布和挥发性测量值

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摘要

Ultrafine particle number concentrations and size distributions were measured on the platform of a metro station in Athens, Greece, and compared with those recorded at an urban background station. The volatility of the sampled particles was measured in parallel, providing further insights on the mixing state and composition of the sampled particles. Particle concentration exhibited a mean value of 1.2 x 10(4) # cm(-3) and showed a weak correlation with train passage frequency, but exhibited a strong correlation with urban background particle concentrations. The size distribution appears to be strongly influenced by outdoor conditions, such as the morning traffic rush hour and new particle formation events observed at noon. The aerosol in the metro was externally mixed throughout the day, with particle populations being identified (1) as fully refractory particles being more dominant during the morning traffic rush hours, (2) as core-shell structure particles having a non-volatile core coated with volatile material, and (3) fully volatile particles. The evolution of particle volatility and size throughout the day provide additional support that most nanoparticles in the metro station originate from outdoor urban air. (C) 2018 Elsevier Ltd. All rights reserved.
机译:在希腊雅典的地铁站台上测量了超细颗粒物的浓度和粒度分布,并将其与城市背景站的记录进行了比较。平行测量样品颗粒的挥发度,从而进一步了解样品颗粒的混合状态和组成。颗粒物浓度的平均值为1.2 x 10(4)#cm(-3),与火车通过频率的相关性较弱,但与城市背景颗粒物的浓度相关性较强。尺寸分布似乎受到室外条件的强烈影响,例如早晨的交通高峰时间和中午观察到的新的颗粒形成事件。地铁中的气溶胶全天都在外部混合,其中颗粒群被确定为(1)在早上交通高峰时段占主导地位的完全难熔颗粒,(2)为具有不挥发核芯的核壳结构颗粒(3)完全挥发的颗粒。一天中粒子挥发性和大小的变化为地铁站中的大多数纳米粒子源自室外城市空气提供了额外的支持。 (C)2018 Elsevier Ltd.保留所有权利。

著录项

  • 来源
    《Environmental Pollution》 |2018年第8期|82-94|共13页
  • 作者单位

    NCSR Demokritos, Inst Nucl & Radiol Sci & Technol, Energy & Safety Environm Radioact Lab, Athens 15310, Greece;

    NCSR Demokritos, Inst Nucl & Radiol Sci & Technol, Energy & Safety Environm Radioact Lab, Athens 15310, Greece;

    Delft Univ Technol, Fac Civil Engn & Geosci, NL-2628 CN Delft, Netherlands;

    Univ Essex, Sch Biol Sci, Colchester C04 3SQ, Essex, England;

    NCSR Demokritos, Inst Nucl & Radiol Sci & Technol, Energy & Safety Environm Radioact Lab, Athens 15310, Greece;

  • 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);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Aerosol volatility; Metro; Mixing state; Ultrafine particles; Urban aerosol;

    机译:气溶胶挥发性;城市;混合状态;超细颗粒;城市气溶胶;
  • 入库时间 2022-08-17 13:25:52

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