...
首页> 外文期刊>Environmental Science & Technology >Insights into Secondary Organic Aerosol Formation Mechanisms from Measured Gas/Particle Partitioning of Specific Organic Tracer Compounds
【24h】

Insights into Secondary Organic Aerosol Formation Mechanisms from Measured Gas/Particle Partitioning of Specific Organic Tracer Compounds

机译:通过测量气体/特定有机示踪剂化合物的颗粒分配,了解次级有机气溶胶形成机理

获取原文
获取原文并翻译 | 示例
           

摘要

In situ measurements of organic compounds in both gas and particle phases were made with a thermal desorption aerosol gas chromatography (TAG) instrument. The gas/particle partitioning of phthalic acid, pinonaldehyde, and 6,10,14-trimethyl-2-pentadecanone is discussed in detail to explore secondary organic aerosol (SOA) formation mechanisms. Measured fractions in the particle phase (f_(part)) of 6,10,14-trimethyl-2-pentadecanone were similar to those expected from the absorptive gas/particle partitioning theory, suggesting that its partitioning is dominated by absorption processes. However, f_(part) of phthalic acid and pinonaldehyde were substantially higher than predicted. The formation of low-volatility products from reactions of phthalic acid with ammonia is proposed as one possible mechanism to explain the high f_(part) of phthalic acid. The observations of particle-phase pinonaldehyde when inorganic acids were fully neutralized indicate that inorganic acids are not required for the occurrence of reactive uptake of pinonaldehyde on particles. The observed relationship between f_(part) of pinonaldehyde and relative humidity suggests that the aerosol water plays a significant role in the formation of particle-phase pinonaldehyde. Our results clearly show it is necessary to include multiple gas/particle partitioning pathways in models to predict SOA and multiple SOA tracers in source apportionment models to reconstruct SOA.
机译:用热脱附气溶胶气相色谱仪(TAG)对气相和颗粒相中的有机化合物进行原位测量。详细讨论了邻苯二甲酸,松二醛和6,10,14-三甲基-2-十五碳二烯酮的气体/颗粒分配,以探讨次级有机气溶胶(SOA)的形成机理。 6,10,14-三甲基-2-十五烷酮的颗粒相(f_(部分))中的测量分数与吸收性气体/颗粒分配理论所预期的相似,这表明其分配主要由吸收过程决定。但是,邻苯二甲酸和松醛的f(部分)明显高于预期。提出了由邻苯二甲酸与氨反应生成低挥发性产物的一种可能机理,用以解释邻苯二甲酸的高f(部分)。当无机酸被完全中和时,颗粒相品脱醛的观察结果表明,品脱醛在颗粒上的反应性吸收不需要无机酸。松果醛的f_(部分)与相对湿度之间的关系表明,气溶胶水在颗粒相松果醛的形成中起着重要作用。我们的结果清楚地表明,有必要在模型中包括多个气体/颗粒分配路径以预测SOA,并在源分配模型中包括多个SOA示踪剂以重建SOA。

著录项

  • 来源
    《Environmental Science & Technology》 |2013年第8期|3781-3787|共7页
  • 作者单位

    Department of Environmental Science, Policy and Management, University of California, Berkeley, California;

    Aerosol Dynamics Inc., Berkeley, California;

    Department of Environmental Science, Policy and Management, University of California, Berkeley, California ,Aerosol Dynamics Inc., Berkeley, California;

    Department of Environmental Science, Policy and Management, University of California, Berkeley, California;

    Department of Environmental Science, Policy and Management, University of California, Berkeley, California;

    Scripps Institution of Oceanography, University of California, San Diego, California;

    Scripps Institution of Oceanography, University of California, San Diego, California ,Cooperative Institute for Research in the Environmental Sciences, University of Colorado, Boulder, Colorado;

    Scripps Institution of Oceanography, University of California, San Diego, California;

    Department of Chemistry, University of Toronto, Toronto, Canada;

    Department of Chemistry, University of Toronto, Toronto, Canada;

    Department of Chemistry, University of Toronto, Toronto, Canada;

    Aerosol Dynamics Inc., Berkeley, California;

    Department of Environmental Science, Policy and Management, University of California, Berkeley, California;

  • 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
  • 中图分类
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱:kefu@zhangqiaokeyan.com

京公网安备:11010802029741号 ICP备案号:京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有
  • 客服微信

  • 服务号