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首页> 外文期刊>Proceedings of the National Academy of Sciences of the United States of America >In situ measurements of gas/particle-phase transitions for atmospheric semivolatile organic compounds
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In situ measurements of gas/particle-phase transitions for atmospheric semivolatile organic compounds

机译:大气中半挥发性有机化合物的气相/颗粒相变的原位测量

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摘要

An understanding of the gas/particle-phase partitioning of semi-volatile compounds is critical in determining atmospheric aerosol formation processes and growth rates, which in turn affect global climate and human health. The Study of Organic Aerosol at Riverside 2005 campaign was performed to gain a better understanding of the factors responsible for aerosol formation and growth in Riverside, CA, a region with high concentrations of secondary organic aerosol formed through the phase transfer of low-volatility reaction products from the oxidation of precursor gases. We explore the ability of the thermal desorption aerosol gas chromatograph (TAG) to measure gas-to-particle-phase transitioning for several organic compound classes (polar and nonpolar) found in the ambient Riverside atmosphere by using in situ observations of several hundred semivolatile organic compounds. Here we compare TAG measurements to modeled partitioning of select semivolatile organic compounds. Although TAG was not designed to quantify the vapor phase of semivolatile organics, TAG measurements do distinguish when specific compounds are dominantly in the vapor phase, are dominantly in the particle phase, or have both phases present. Because the TAG data are both speciated and time-resolved, this distinction is sufficient to see the transition from vapor to particle phase as a function of carbon number and compound class. Laboratory studies typically measure the phase partitioning of semivolatile organic compounds by using pure compounds or simple mixtures, whereas hourly TAG phase partitioning measurements can be made in the complex mixture of thousands of polaronpolar and organic/ inorganic compounds found in the atmosphere.
机译:了解半挥发性化合物的气相/颗粒分配对确定大气气溶胶的形成过程和增长率至关重要,而这反过来又会影响全球气候和人类健康。开展了2005年Riverside活动中的有机气溶胶研究,以更好地了解导致加利福尼亚州Riverside气溶胶形成和生长的因素,该地区通过低挥发性反应产物的相转移形成了高浓度的次级有机气溶胶。来自前体气体的氧化。我们探索热解吸气溶胶气相色谱仪(TAG)通过使用几百种半挥发性有机物的原位观测来测量在河滨环境中发现的几种有机化合物类别(极性和非极性)的气相到颗粒相变的能力化合物。在这里,我们将TAG测量结果与选定的半挥发性有机化合物的建模分区进行了比较。尽管TAG并非旨在量化半挥发性有机物的气相,但是TAG测量确实可以区分特定化合物是何时在气相中占主导地位,在颗粒相中占主导地位,还是同时存在两种相。因为TAG数据既是特定数据又是时间分辨数据,所以这种区别足以看出从气相到颗粒相的转变是碳数和化合物类别的函数。实验室研究通常通过使用纯化合物或简单混合物来测量半挥发性有机化合物的相分配,而每小时TAG相分配测量可以在大气中发现的数千种极性/非极性和有机/无机化合物的复杂混合物中进行。

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  • 作者单位

    Department of Environmental Science, Policy, and Management, University of California, 147 Mulford Hall, Berkeley, CA 94720 Aerodyne Research Inc., 45 Manning Road, Billerica, MA 01821 Department of Mechanical Engineering, University of Minnesota, 271 Mechanical Engineering, 111 Church Street S.E., Minneapolis, MN 55455;

    Department of Environmental Science, Policy, and Management, University of California, 147 Mulford Hall, Berkeley, CA 94720 Department of Civil and Environmental Engineering, University of California, 147 Mulford Hall, Berkeley, CA 94720;

    Aerosol Dynamics Inc., 935 Grayson Street, Berkeley, CA 94710;

    Aerosol Dynamics Inc., 935 Grayson Street, Berkeley, CA 94710;

  • 收录信息 美国《科学引文索引》(SCI);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

    gas chromatography; mass spectrometry; organic aerosol; phase partitioning; thermal desorption;

    机译:气相色谱法;质谱;有机气雾剂相分割;热脱附;

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