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首页> 外文期刊>Environmental Science & Technology >A Passive Sampler with Improved Performance for Collecting Gaseous and Particulate Phase Polycyclic Aromatic Hydrocarbons in Air
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A Passive Sampler with Improved Performance for Collecting Gaseous and Particulate Phase Polycyclic Aromatic Hydrocarbons in Air

机译：具有改进性能的无源采样器，用于收集空气中的气态和颗粒相多环芳烃

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摘要

A passive sampler which can be used to collect both gaseous and particulate phase polycyclic aromatic hydrocarbons (PAHs) in air was previously developed and calibrated. The sampler was successfully used in a field study in North China Plain. However, the relatively low uptake rate for particulate phase PAHs prevented it from being applied in nonseverely contaminated environment The sampler was redesigned to increase the uptake rate for particulate phase PAHs and calibrated in the field for individual PAH compounds of various molecular sizes. The effect of a fine-screen-mesh wrapping on the performance of the sampler was tested. It was found that the sampling efficiencies of the sampler for various PAH compounds were different depending on their molecular weights. For particulate phase PAHs, the uptake rates for high molecular weight compounds, which are favorably associated with fine particles, were generally lower than those for low molecular weight ones. Two calibration equations with molecular weight as an independent variable were developed to predict the ambient air concentrations of gaseous and particulate phase PAHs based on the results of the passive sampling. The uptake rates of the sampler were different for various PAH compounds. On average, the uptake rates of the sampler for gaseous and particulate phase PAHs were 0.38 ± 0.51 m~3/d and 0.61 ± 1.41 m~3/d, respectively. The latter was 2 orders of magnitude higher than the old model. The sampler was less efficient than active sampler for collecting fine particles in the air and such bias in sampled size distribution can be moderated by a fine-screen-mesh wrapping. However, the wrapping could also reduce the sampling efficiency.
机译：先前已经开发并校准了可用于收集空气中的气相和颗粒相多环芳烃（PAH）的无源采样器。该采样器已成功用于华北平原的野外研究。但是，颗粒相PAH的吸收率相对较低，因此无法将其应用在未受到严重污染的环境中。重新设计了采样器，以提高颗粒相PAH的吸收率，并在现场对各种分子大小的单个PAH化合物进行了校准。测试了细筛网包裹对采样器性能的影响。已经发现，对于各种PAH化合物，采样器的采样效率因分子量而异。对于颗粒相PAH，高分子量化合物的吸收速率通常比低分子量化合物的吸收速率低，而高分子量化合物有利地与微粒结合。建立了两个以分子量为自变量的校准方程，根据被动采样的结果预测气相和颗粒相PAHs的环境空气浓度。对于各种PAH化合物，采样器的吸收速率不同。平均而言，采样器对气相和颗粒相PAHs的吸收速率分别为0.38±0.51 m〜3 / d和0.61±1.41 m〜3 / d。后者比旧模型高2个数量级。在空气中收集细颗粒物方面，采样器的效率不如主动采样器，并且可以通过细筛网包裹减轻采样尺寸分布中的这种偏差。但是，包裹也可能降低采样效率。

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  • 来源
    《Environmental Science & Technology》 |2009年第11期|4124-4129|共6页
  • 作者

    SHU TAO; JUN CAO; WENTAO WANG; JINGYU ZHAO; WEI WANG; ZANHONG WANG; HONGYING CAO; BAOSHAN XING;

  • 作者单位

    Laboratory for Earth Surface Processes, College of Urban and Environmental Sciences, Peking University, Beijing 100871, China Department of Plant, Soil and Insect Sciences, University of Massachusetts, Amherst, Massachusetts 01003-7245;

    Laboratory for Earth Surface Processes, College of Urban and Environmental Sciences, Peking University, Beijing 100871, China;

    Laboratory for Earth Surface Processes, College of Urban and Environmental Sciences, Peking University, Beijing 100871, China;

    Laboratory for Earth Surface Processes, College of Urban and Environmental Sciences, Peking University, Beijing 100871, China;

    Laboratory for Earth Surface Processes, College of Urban and Environmental Sciences, Peking University, Beijing 100871, China;

    College of Resources and Environmental Science, Hebei Normal University 050016,China;

    Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China;

    Department of Plant, Soil and Insect Sciences, University of Massachusetts, Amherst, Massachusetts 01003-7245;

  • 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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