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首页> 外文期刊>Environmental Science & Technology >Measurements of Secondary Organic Aerosol Formed from OH-initiated Photo-oxidation of Isoprene Using Online Photoionization Aerosol Mass Spectrometry
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Measurements of Secondary Organic Aerosol Formed from OH-initiated Photo-oxidation of Isoprene Using Online Photoionization Aerosol Mass Spectrometry

机译：使用在线光电离气溶胶质谱法测量由OH引发的异戊二烯光氧化形成的次级有机气溶胶

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摘要

Isoprene is a significant source of atmospheric organic aerosol; however, the secondary organic aerosol (SOA) formation and involved chemical reaction pathways have remained to be elucidated. Recent works have shown that the photo-oxidation of isoprene leads to form SOA In this study, the chemical composition of SOA from the OH- initiated photo-oxidation of isoprene, in the absence of seed aerosols, was investigated through the controlled laboratory chamber experiments. Thermal desorption/tunable vacuum-ultraviolet photoionization time-of- flight aerosol mass spectrometry (TD-VUV-TOF-PIAMS) was used in conjunction with the environmental chamber to study SOA formation. The mass spectra obtained at different photon energies and the photoionization efficiency (PIE) spectra of the SOA products can be obtained in real time. Aided by the ionization energies (IE) either from the ab initio calculations or the literatures, a number of SOA products were proposed. In addition to methacrolein, methyl vinyl ketone, and 3-methyI-furan, carbonyls, hydroxycarbonyls, nitrates, hydroxynitrates, and other oxygenated compounds in SOA formed in laboratory photo-oxiadation experiments were identified, some of them were investigated for the first time. Detailed chemical identification of SOA is crucial for understanding the photo-oxidation mechanisms of VOCs and the eventual formation of SOA Possible reaction mechanisms will be discussed.
机译：异戊二烯是大气中有机气溶胶的重要来源。然而，次级有机气溶胶（SOA）的形成和涉及的化学反应途径仍有待阐明。最近的工作表明，异戊二烯的光氧化会形成SOA。在这项研究中，通过受控的实验室试验研究了在没有种子气溶胶的情况下，由OH引发的异戊二烯的光引发的SOA的化学成分。 。热脱附/可调真空紫外光电离飞行时间气溶胶质谱法（TD-VUV-TOF-PIAMS）与环境室一起用于研究SOA的形成。可以实时获得在不同光子能量下获得的质谱和SOA产物的光电离效率（PIE）光谱。通过从头算或通过文献获得的电离能（IE）的帮助，提出了许多SOA产品。除了甲基丙烯醛，甲基乙烯基酮和3-甲基甲基呋喃外，还鉴定了实验室光氧化实验中形成的SOA中的羰基，羟基羰基，硝酸盐，羟基硝酸盐和其他含氧化合物，其中一些是首次进行了研究。 SOA的详细化学鉴定对于理解VOC的光氧化机理和SOA的最终形成至关重要。将讨论可能的反应机理。

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  • 来源
    《Environmental Science & Technology》 |2012年第7期|p.3898-3904|共7页
  • 作者

    Wenzheng Fang; Lei Gong; Qiang Zhang; Maoqi Cao; Yuquan Li; Liusi Sheng;

  • 作者单位

    National Synchrotron Radiation Laboratory, School of Nuclear Science and Technology, University of Science and Technology of China, Hefei 230029, China;

    National Synchrotron Radiation Laboratory, School of Nuclear Science and Technology, University of Science and Technology of China, Hefei 230029, China;

    National Synchrotron Radiation Laboratory, School of Nuclear Science and Technology, University of Science and Technology of China, Hefei 230029, China;

    National Synchrotron Radiation Laboratory, School of Nuclear Science and Technology, University of Science and Technology of China, Hefei 230029, China;

    National Synchrotron Radiation Laboratory, School of Nuclear Science and Technology, University of Science and Technology of China, Hefei 230029, China;

    National Synchrotron Radiation Laboratory, School of Nuclear Science and Technology, University of Science and Technology of China, Hefei 230029, China;

  • 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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