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首页> 外文期刊>Environmental Science & Technology >Glyoxal-Methylglyoxal Cross-Reactions in Secondary Organic Aerosol Formation
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Glyoxal-Methylglyoxal Cross-Reactions in Secondary Organic Aerosol Formation

机译：次级有机气溶胶形成中的乙二醛-甲基乙二醛交叉反应

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摘要

Glyoxal (G) and methylglyoxal (MG) are potentially important secondary organic aerosol (SOA) precursors. Previous studies of SOA formation by G and MG have focused on either species separately; however, G and MG typically coexist in the atmosphere. We studied the formation of secondary organic material in aqueous aerosol mimic mixtures containing G and MG with ammonium sulfate. We characterized the formation of light-absorbing products using UV-vis spectrophotometry. We found that absorption at 280 nm can be described well using models for the formation of light-absorbing products by G and MG in parallel. Pendant drop tensiometry measurements showed that surface tension depression by G and MG in these solutions can be modeled as a linear combination of the effects of G and MG alone. Product species were identified using chemical ionization mass spectrometry with a volatilization flow tube inlet (Aerosol CIMS). Peaks consistent with G-MG cross-reaction products were observed, accounting for a significant fraction of detected product mass, but most peaks could be attributed to self-reaction. We conclude that cross-reactions contribute to SOA mass from uptake of G and MG, but they are not required to accurately model the effects of this process on aerosol surface tension or light absorption.
机译：乙二醛（G）和甲基乙二醛（MG）是潜在重要的次要有机气溶胶（SOA）前体。 G和MG先前关于SOA形成的研究分别集中于两个物种。但是，G和MG通常在大气中共存。我们研究了含G和MG与硫酸铵的水性气溶胶模拟混合物中二次有机物质的形成。我们使用紫外可见分光光度法表征了吸光产品的形成。我们发现使用G和MG平行形成吸光产物的模型可以很好地描述280 nm处的吸收。坠落张力测定法测量表明，在这些溶液中G和MG降低的表面张力可以建模为G和MG单独作用的线性组合。使用化学离子化质谱仪和挥发分流管入口（Aerosol CIMS）鉴定产品种类。观察到与G-MG交叉反应产物一致的峰，占检测到的产物质量的很大部分，但大多数峰可归因于自身反应。我们得出的结论是，交叉反应会因吸收G和MG而导致SOA量增加，但不需要它们精确地模拟此过程对气溶胶表面张力或光吸收的影响。

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  • 来源
    《Environmental Science & Technology》 |2010年第16期|p.6174-6182|共9页
  • 作者

    ALLISON N. SCHWIER; NEHA SAREEN; DHRUV MITROO; ERICA L. SHAPIRO; V. FAYE MCNEILL;

  • 作者单位

    Department of Chemical Engineering, Columbia University,New York, New York 10027;

    rnDepartment of Chemical Engineering, Columbia University,New York, New York 10027;

    rnDepartment of Chemical Engineering, Columbia University,New York, New York 10027;

    rnDepartment of Chemical Engineering, Columbia University,New York, New York 10027;

    rnDepartment of Chemical Engineering, Columbia University,New York, New York 10027;

  • 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
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