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首页> 外文期刊>Environmental Science & Technology >Uptake of Epoxydiol Isomers Accounts for Half of the Particle-Phase Material Produced from Isoprene Photooxidation via the HO_2 Pathway
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Uptake of Epoxydiol Isomers Accounts for Half of the Particle-Phase Material Produced from Isoprene Photooxidation via the HO_2 Pathway

机译：环氧乙烷异构体的吸收占异戊二烯通过HO_2途径光氧化产生的颗粒相物质的一半

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摘要

The oxidation of isoprene is a globally significant source of secondary organic material (SOM) of atmospheric particles. The relative importance of different parallel pathways, however, remains inadequately understood and quantified. SOM production from isoprene photooxidation was studied under hydroperoxyl-dominant conditions for ＜5% relative humidity and at 20 ℃ in the presence of highly acidic to completely neutralized sulfate particles. Isoprene photooxidation was separated from SOM production by using two continuously mixed flow reactors connected in series and operated at steady state. Two online mass spectrometers separately sampled the gas and particle phases in the reactor outflow. The loss of specific gas-phase species as contributors to the production of SOM was thereby quantified. The produced SOM mass concentration was directly proportional to the loss of isoprene epoxydiol (IEPOX) isomers from the gas phase. IEPOX isomers lost from the gas phase accounted for (46 ± 11)% of the produced SOM mass concentration. The IEPOX isomers comprised (59 ± 21)% (molecular count) of the loss of monitored gas-phase species. The implication is that for the investigated reaction conditions the SOM production pathways tied to IEPOX isomers accounted for half of the SOM mass concentration.
机译：异戊二烯的氧化是大气颗粒的次要有机材料（SOM）的全球重要来源。然而，对不同平行途径的相对重要性仍缺乏足够的了解和量化。在高酸性至完全中和的硫酸盐粒子存在下，以过氧化氢为主导的条件下，相对湿度小于5％，在20℃下，研究了异戊二烯光氧化产生的SOM。通过使用两个串联连接并在稳态下运行的连续混合流反应器，将异戊二烯光氧化与SOM生产分离。两个在线质谱仪分别对反应器流出物中的气相和颗粒相进行了采样。从而定量确定了导致SOM产生的特定气相物质的损失。产生的SOM质量浓度与气相中异戊二烯环氧二醇（IEPOX）异构体的损失成正比。气相损失的IEPOX异构体占产生的SOM质量浓度的（46±11）％。 IEPOX异构体占所监测气相物质损失的（59±21）％（分子计数）。这意味着对于所研究的反应条件，与IEPOX异构体相关的SOM生产途径占SOM质量浓度的一半。

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  • 来源
    《Environmental Science & Technology》 |2015年第1期|250-258|共9页
  • 作者

    Yingjun Liu; Mikinori Kuwata; Benjamin F. Strick; Franz M. Geiger; Regan J. Thomson; Karena A. McKinney; Scot T. Martin;

  • 作者单位

    School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, United States;

    School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, United States,Division of Earth Sciences, Nanyang Technological University, Singapore, and Earth Observatory of Singapore;

    Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States;

    Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States;

    Department of Chemistry, Northwestern University, Evanston, Illinois 60208, United States;

    School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, United States;

    School of Engineering and Applied Sciences, Harvard University, Cambridge, Massachusetts 02138, United States,Department of Earth and Planetary Sciences, Harvard University, Cambridge, Massachusetts 02138, 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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