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Heating-Induced Evaporation of Nine Different Secondary Organic Aerosol Types

机译：九种不同类型的次级有机气溶胶的加热诱导蒸发

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摘要

The volatility of the compounds comprising organic aerosol (OA) determines their distribution between the gas and particle phases. However, there is a disconnect between volatility distributions as typically derived from secondary OA (SOA) growth experiments and the effective particle volatility as probed in evaporation experiments. Specifically, the evaporation experiments indicate an overall much less volatile SOA. This raises questions regarding the use of traditional volatility distributions in the simulation and prediction of atmospheric SOA concentrations. Here, we present results from measurements of thermally induced evaporation of SOA for nine different SOA types (i.e., distinct volatile organic compound and oxidant pairs) encompassing both anthropogenic and biogenic compounds and O_3 and OH to examine the extent to which the low effective volatility of SOA is a general phenomenon or specific to a subset of SOA types. The observed extents of evaporation with temperature were similar for all the SOA types and indicative of a low effective volatility. Furthermore, minimal variations in the composition of all the SOA types upon heating-induced evaporation were observed. These results suggest that oligomer decomposition likely plays a major role in controlling SOA evaporation, and since the SOA formation time scale in these measurements was less than a minute, the oligomer-forming reactions must be similarly rapid. Overall, these results emphasize the importance of accounting for the role of condensed phase reactions in altering the composition of SOA when assessing particle volatility.
机译：包含有机气溶胶（OA）的化合物的挥发性决定了它们在气相和颗粒相之间的分布。但是，通常来自二次OA（SOA）生长实验的挥发度分布与蒸发实验中探测到的有效颗粒挥发度之间没有联系。具体而言，蒸发实验表明总体上挥发性较低的SOA。这引发了有关在大气SOA浓度的模拟和预测中使用传统挥发性分布的问题。在这里，我们提供了对9种不同的SOA类型（即，不同的挥发性有机化合物和氧化剂对）进行热诱导的SOA蒸发测量的结果，其中包括人为和生物生成化合物以及O_3和OH，以检查低有效挥发性的程度。 SOA是普遍现象或特定于SOA类型的子集。对于所有SOA类型，观察到的随温度的蒸发程度均相似，表明有效挥发性较低。此外，在加热引起的蒸发后，观察到所有SOA类型组成的最小变化。这些结果表明，低聚物分解可能在控制SOA蒸发中起主要作用，并且由于这些测量中SOA形成的时间尺度小于一分钟，因此形成低聚物的反应必须同样快。总体而言，这些结果强调了在评估颗粒挥发性时，考虑凝结相反应在改变SOA组成中的作用的重要性。

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  • 来源
    《Environmental Science & Technology》 |2015年第20期|12242-12252|共11页
  • 作者

    Katheryn R. Kolesar; Ziyue Li; Kevin R. Wilson; Christopher D. Cappa;

  • 作者单位

    Department of Civil and Environmental Engineering University of California, Davis, One Shields Avenue, Davis, California 95616, United States;

    Atmospheric Science Graduate Group, University of California, Davis, One Shields Avenue, Davis, California 95616, United States;

    Chemical Sciences Division, Lawrence Berkeley National Laboratory, One Cyclotron Road, Berkeley, California 94720, United States;

    Department of Civil and Environmental Engineering University of California, Davis, One Shields Avenue, Davis, California 95616, 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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  • 正文语种 eng
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