Characterization of trace aerosol compositions produced during the OH radical-initiated photooxidation of β-pinene

Characterization of trace aerosol compositions produced during the OH radical-initiated photooxidation of β-pinene
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OH 自由基引发的 β-蒎烯光氧化过程中产生的微量气溶胶成分的表征

DOI:
10.1016/j.atmosenv.2019.04.060
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发表时间:
2019-08
影响因子:
5
通讯作者:
Bo Yang
Bo Yang
中科院分区:
环境科学与生态学2区
文献类型:
--
作者:
Peng Zhang;Jingyun Huang;Jinian Shu;Pengkun Ma;Bo Yang

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采用热脱附二氯甲烷辅助低压光电离质谱(TD-CH 2Cl 2-assisted LPPI-MS)技术研究了高浓度NO光氧化β-蒎烯(βP)过程中产生的二次有机气溶胶(SOA)的详细分子组成。我们发现质子化的去甲品酮给出了最高的信号强度,这支持了该化合物是负责促进βP-SOA形成的关键氧化物种的假设。除了先前鉴定的单体(即,2,2-二甲基环丁基-1,3-二甲醛(m/z 140)、蒎烯醛(m/z 150)、桃金娘烯醇(m/z 152)、甲酸(2,2-二甲基-3-乙酰基)-环丁基酯(m/z 156)、蒎烯酸(m/z 166)和3-频哪酸的异构体(m/z 170)),两种另外的含氮物质(即,在βP-SOA的质谱图中还观察到C10羟基硝酸酯和C10羰基硝酸酯)的atm/z值分别为214和216。此外,18(H2O),46(NO2),和64(H2O + NO2)的损失归因于典型的裂解途径的两个含氮物种。总之,这些结果不仅有助于提高对βP-SOA形成的理解,而且它们还表明TD-CH 2Cl 2辅助LPPI-MS可以用作研究SOA形成的新检测手段。
The detailed molecular composition of laboratory-generated secondary organic aerosols (SOA) during the high-NO photooxidation of β-pinene (βP) was investigated using a novel thermal desorption dichloromethane-assisted low-pressure photoionization mass spectrometry (TD-CH2Cl2-assisted LPPI-MS) technique. We found that protonated norpinone gave the highest signal intensity, which supported that assumption that this compound was the key oxidation species responsible for promoting βP-SOA formation. In addition to the previously identified monomers (i.e., 2,2-dimethylcyclobutyl-1,3-dicarboxaldehyde (m/z140), pinene aldehyde (m/z150), myrtenol (m/z152), (2,2-dimethyl-3-acetyl)-cyclobutylformate (m/z156), pinene acid (m/z166), and isomers of pinalic-3-acid (m/z170)), two additional nitrogen-containing species (i.e., C10hydroxy nitrate and C10carbonyl nitrate) were also observed atm/zvalues of 214 and 216 in the mass spectrum of βP-SOA. Furthermore, the losses of 18 (H2O), 46 (NO2), and 64 (H2O + NO2) were attributed to the typical fragmentation pathways of the two nitrogen-containing species. Overall, these results not only contribute to an improved understanding of βP-SOA formation, but they also indicate that TD-CH2Cl2-assisted LPPI-MS can be used as a novel detection means to study SOA formation.
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