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首页> 外文期刊>Environmental Science & Technology >Effects of Precursor Concentration and Acidic Sulfate in Aqueous Glyoxal-OH Radical Oxidation and Implications for Secondary Organic Aerosol
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Effects of Precursor Concentration and Acidic Sulfate in Aqueous Glyoxal-OH Radical Oxidation and Implications for Secondary Organic Aerosol

机译：前体浓度和酸性硫酸根在乙二醛-OH自由基氧化中的作用及其对二次有机气溶胶的影响

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摘要

Previous experiments demonstrated that aqueous OH radical oxidation of glyoxal yields low-volatility compounds. When this chemistry takes place in clouds and fogs, followed by droplet evaporation (or if it occurs in aerosol water), the products are expected to remain partially in the particle phase, forming secondary organic aerosol (SOA). Acidic sulfate exists ubiquitously in atmospheric water and has been shown to enhance SOA formation through aerosol phase reactions. Inthis work, we investigate how starting concentrations of glyoxal (30-3000 μM) and the presence of acidic sulfate (0-840 μM) affect product formation in the aqueous reaction between glyoxal and OH radical. The oxalic acid yield decreased with increasing precursor concentrations, and the presence of sulfuric acid did not alter oxalic acid concentrations significantly. A dilute aqueous chemistry model successfully reproduced oxalic acid concentrations, when the experiment was performed at cloud-relevant concentrations (glyoxal <30μM), but predictions deviated from measurements at increasing concentrations. Results elucidate similarities and differences in aqueous glyoxal chemistry in clouds and in wet aerosols. They validate for the first time the accuracy of model predictions at cloud-relevant concentrations. These results suggest mat cloud processing of glyoxal could be an important source of SOA.
机译：先前的实验表明乙二醛的含水OH自由基氧化可产生低挥发性化合物。当这种化学反应在云层和雾中发生，然后发生液滴蒸发（或者如果发生在气溶胶水中）时，预期产品会部分保留在颗粒相中，形成二次有机气溶胶（SOA）。酸性硫酸盐普遍存在于大气水中，并已显示可通过气溶胶相反应增强SOA的形成。在这项工作中，我们研究了乙二醛的起始浓度（30-3000μM）和酸性硫酸盐（0-840μM）的存在如何影响乙二醛与OH自由基之间的水性反应中的产物形成。草酸收率随着前体浓度的增加而降低，硫酸的存在并没有明显改变草酸的浓度。当在与云相关的浓度（乙二醛<30μM）下进行实验时，稀水化学模型成功地再现了草酸浓度，但预测值与浓度增加时的测量结果偏离。结果阐明了云和湿气溶胶中乙二醛水溶液化学的异同。他们首次验证了与云有关的浓度下模型预测的准确性。这些结果表明乙二醛的云计算处理可能是SOA的重要来源。

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  • 来源
    《Environmental Science & Technology》 |2009年第21期|8105-8112|共8页
  • 作者

    YI TAN; MARK J. PERRI; SYBIL P. SEITZINGER; BARBARA I. TURPIN;

  • 作者单位

    Department of Environmental Sciences, Rutgers University, 14 College Farm Road, New Brunswick, New Jersey 08901;

    Department of Environmental Sciences, Rutgers University, 14 College Farm Road, New Brunswick, New Jersey 08901;

    Institute of Marine and Coastal Sciences, Rutgers University, 71 Dudley Road, New Brunswick, New Jersey 08901;

    Institute of Marine and Coastal Sciences, Rutgers University, 71 Dudley Road, New Brunswick, New Jersey 08901;

  • 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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