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Exposure to SVOCs from Inhaled Particles: Impact of Desorption

机译：吸入颗粒接触SVOC：解吸的影响

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摘要

Inhaled semivolatile organic compounds (SVOCs) are simultaneously present in gas and particle phases. Particles desorb a fraction of their SVOCs moving through the human respiratory tract (RT). Quantifying such desorption is challenging but important since gas- and particle-phase SVOCs deposit in different locations in the RT, encountering different cell populations with varying health consequences. This paper presents a mass transfer model to quantify this desorption process in the head, tracheobronchial, and alveolar regions of the RT. The desorption of SVOCs from inhaled particles can be gauged using the ratio of particle residence time to the time required to achieve particle/gas equilibrium. Results indicate that the larger this ratio is, the more likely particles desorb the SVOCs they carry. For particles smaller than 0.5 μm diameter and SVOCs with a particle/gas partition coefficient (unitless) of 10~(10), accounting for desorption reduces the estimated particle-phase SVOC concentrations in the alveolar region by more than 35%; the reduction is almost 700% for 0.05 μn diameter particles. In hypothetical scenarios representing common indoor and outdoor situations, neglecting desorption significantly overestimates the concentration of ultrafine particle associated SVOCs in the alveolar region. This model is a preliminary step toward more nuanced estimates of exposure to inhaled SVOCs.
机译：气相和颗粒相中同时存在吸入的半挥发性有机化合物（SVOC）。颗粒会解吸通过人体呼吸道（RT）的一部分SVOC。量化这种解吸具有挑战性，但很重要，因为气相和颗粒状SVOC会沉积在RT的不同位置，遇到不同的细胞群体，并对健康造成不同的影响。本文提出了一种传质模型，以量化RT头部，气管支气管和肺泡区域的解吸过程。 SVOC从吸入颗粒中的解吸可以使用颗粒停留时间与达到颗粒/气体平衡所需时间的比率来衡量。结果表明，该比率越大，颗粒越有可能解吸它们携带的SVOC。对于直径小于0.5μm的颗粒和颗粒/气体分配系数（无单位）为10〜（10）的SVOC，考虑到解吸，会使肺泡区域中估计的颗粒相SVOC浓度降低35％以上；对于直径为0.05μn的颗粒，减少量几乎为700％。在代表普通室内和室外情况的假设场景中，忽略解吸会大大高估了牙槽区域中与超细颗粒相关的SVOC的浓度。该模型是朝着对吸入的SVOC暴露进行更细微估算的初步步骤。

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  • 来源
    《Environmental Science & Technology》 |2017年第11期|6220-6228|共9页
  • 作者

    Cong Liu; Yinping Zhang; Charles J. Weschler;

  • 作者单位

    School of Energy and Environment, Southeast University, Nanjing, Jiangsu 210096, China;

    Department of Building Science, Tsinghua University, Beijing 100084, China,Beijing Key Laboratory of Indoor Air Quality Evaluation and Control, Beijing 100084, China;

    Department of Building Science, Tsinghua University, Beijing 100084, China,Environmental and Occupational Health Sciences Institute, Rutgers University, Piscataway, New Jersey 08854, United States,Beijing Key Laboratory of Indoor Air Quality Evaluation and Control, Beijing 100084, China;

  • 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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  • 正文语种 eng
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