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首页> 外文期刊>Environmental Science & Technology >Surprising Formation of p-Cymene in the Oxidation of a-Pinene in Air by the Atmospheric Oxidants OH, O_3, and NO_3
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Surprising Formation of p-Cymene in the Oxidation of a-Pinene in Air by the Atmospheric Oxidants OH, O_3, and NO_3

机译：大气中的氧化剂OH，O_3和NO_3在空气中对a-P烯的氧化中对-伞花烃的惊人形成

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摘要

Anthropogenic sources release into the troposphere a wide range of volatile organic compounds (VOCs) including aromatic hydrocarbons, whose major sources are believed to be combustion and the evaporation of fossil fuels. An important question is whether there are other sources of aromatics in air. We report here the formation of p-cymene [l-methyl-4-(l-methylethyl) benzene, C6H_4(CH3)(C3H7)] from the oxidation of a-pinene by OH, O_3, and NO_3 at 1 atm in air and 298 K at low (<5%) and high (70%) relative humidities (RH). Loss of a-pinene and the generation ofp-cymene were measured using GC-MS. The fractional yields ofp-cymene relative to the loss of a-pinene, A [p-cymeme]/A [a-pinene], were measured to range from (1.6 ±0.2) x 10~5fortheO_3 reaction to (3.0 ±0.3) X 10~4 for the NO_3 reaction in the absence of added water vapor. The yields for the OH and O_3 reactions increased by a factor of 4-8 at 70% RH (uncertainties are ±2s). The highest yields at 70% RH for the OH and O_3 reactions, ~1$ times higher than for dry conditions, were observed if the walls of the Teflon reaction chamber had been previously exposed to H2SO4 formed from the OH oxidation of SO_2. Possible mechanisms of the conversion of a-pinene to p-cymene and the potential importance in the atmosphere are discussed.
机译：人为来源向对流层释放包括芳香族烃在内的多种挥发性有机化合物（VOC），据信其主要来源为燃烧和化石燃料的蒸发。一个重要的问题是空气中是否还有其他芳香物质来源。我们在这里报告了在空气中1个大气压下，α-pine烯被OH，O_3和NO_3氧化而生成对-甲基异丙基[1-甲基-4-（1-甲基乙基）苯，C6H_4（CH3）（C3H7）]在低（<5％）和高（70％）相对湿度（RH）时为298K。使用GC-MS测量α-pine烯的损失和β-异丙苯的生成。相对于α-pine烯的损失，对-异丙苯的分数收率A [p-cymeme] / A [α-pine烯]的测量范围为O_3反应的（1.6±0.2）x 10〜5至（3.0±0.3）在没有添加水蒸气的情况下，NO_3反应的X 10〜4。在70％相对湿度下，OH和O_3反应的产率提高了4-8倍（不确定度为±2s）。如果铁氟龙反应室的壁事先暴露于SO_2的OH氧化形成的H2SO4，则OH和O_3反应在70％RH下的最高收率比干燥条件高约1 $。讨论了α-pine烯转化为对伞花烯的可能机理以及在大气中的潜在重要性。

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  • 来源
    《Environmental Science & Technology》 |2011年第7期|p.2755-2760|共6页
  • 作者

    Aline Gratien; Stanley N. Johnson; Michael J. Ezell; Matthew L. Dawson; Raffeal Bennett; Barbara J. Finlayson-Pitts;

  • 作者单位

    Department of Chemistry, University of California Irvine, Irvine, California 92697-2025, United States;

    Department of Chemistry, University of California Irvine, Irvine, California 92697-2025, United States;

    Department of Chemistry, University of California Irvine, Irvine, California 92697-2025, United States;

    Department of Chemistry, University of California Irvine, Irvine, California 92697-2025, United States;

    Department of Chemistry, University of California Irvine, Irvine, California 92697-2025, United States;

    Department of Chemistry, University of California Irvine, Irvine, California 92697-2025, United States;

  • 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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