Chemical composition of gas and particle–phase products of OH–initiated oxidation of 1,3,5–trimethylbenzene

Developmental Biology

Mingqiang Huang¹  Weijun Zhang²  Zhenya Wang²  Weixiong Zhao²  Xuejun Gu²  Li Fang²  Changjin Hu²  Xiaoyong Guo² 

[1] Department of Chemistry & Environmental Science, Minnan Normal University, Zhangzhou 363000, PR China$$;Laboratory of Atmospheric Physico–Chemistry, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, PR China$$

关键词: 1;    3;    5–trimethylbenzene;    secondary organic aerosol;    smog chamber;    laser desorption/ionization;    reaction mechanisms;   

DOI  :  10.5094/APR.2014.009

学科分类：农业科学（综合）

来源: Dokuz Eylul Universitesi * Department of Environmental Engineering

【 摘 要 】

A laboratory study was performed to investigate the composition of products formed from OH–initiated oxidation of aromatic hydrocarbon 1,3,5–trimethylbenzene. The experiments were conducted by irradiating 1,3,5–trimethylbenzene/CH₃ONO/NO/air mixtures in smog chamber. The chemical composition of gas and particle–phase products have been investigated with gas chromatography/mass spectrometry (GC/MS) and the aerosol laser time–of–flight mass spectrometer (ALTOFMS), respectively. Experimental results showed that 3,5–dimethyl benzaldehyde, 2,4,6–trimethylphenol, 2–methyl–4–oxo–2–pentenal and 3,5–dimethyl–2–furanone were the predominant products in both the gas and particle–phases. However, there were some differences between detected gas–phase products and those of particle–phase, for example, oxalic acid, 2–methyl–2–hydroxy–3,4–dioxo–pentanal, and 2,3,5–trimethyl–3–nitro–phenol were only existing in the particle–phase. The possible reaction mechanisms leading to these products are also proposed. Compared to offline methods such as GC–MS measurement, the ALTOFMS detection can analyze real–time the secondary organic aerosol (SOA) successfully and provide more information on the products. Thus, ALTOFMS is a useful tool to reveal the formation and transformation processes of SOA particles in smog chambers.

【 授权许可】

Unknown   

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