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Mass Spectrometry Study of OH-initiated Photooxidation of Toluene
Ming-qiang Huang1,2,3, Wei-jun Zhang*1,2, Zhen-ya Wang1,2, Li Fang1,2, Rui-hong Kong4, Xiao-bin Shan4, Fu-yi Liu4, Liu-si Sheng4
1.Key Laboratory of Atmospheric Composition and Optical Radiation, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China;2.Laboratory of Environment Spectroscopy, Anhui Institute of Optics and Fine Mechanics, Chinese Academy Of Sciences, Hefei 230031, China;3.Department of Environmental Science and Engineering, Tan Kah Kee College, Xiamen University, Xiamen 363105, China;4.National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei 230029, China
Abstract:
The composition of products formed from photooxidation of the aromatic hydrocarbon toluene was investigated. The OH-initiated photooxidation experiments were conducted by irradiating toluene/CH3ONO/NO/air mixtures in a smog chamber, the gaseous products were detected under the supersonic beam conditions by utilizing vacuum ultraviolet pho-toionization mass spectrometer using synchrotron radiation in real-time. And an aerosol time-of-flight mass spectrometer was used to provide on-line measurements of the individ-ual secondary organic aerosol particle resulting from irradiating toluene. The experimen-tal results demonstrated that there were some differences between the gaseous products and that of particle-phase, the products of glyoxal, 2-hydroxyl-3-oxo-butanal, nitrotoluene, and methyl-nitrophenol only existed in the particle-phase. However, furane, methylglyoxal, 2-methylfurane, benzaldehyde, cresol, and benzoic acid were the predominant photooxidation products in both the gas phase and particle phase.
Key words:  Toluene, Secondary organic aerosol, Smog chamber, Desorption/ionization, Reaction mechanism
FundProject:
OH自由基启动甲苯光氧化产物的质谱
黄明强1,2,3, 张为俊*1,2, 王振亚1,2, 方黎1,2, 孔蕊弘4, 单晓斌4, 刘付轶4, 盛六四4
1.中国科学院安徽光学精密机械研究所大气成分与光学重点实验室,合肥230031;2.中国科学院安徽光学精密机械研究所环境光谱学实验室,合肥230031;3.厦门大学嘉庚学院环境科学与工程系,漳州363105;4.中国科学技术大学国家同步辐射实验室,合肥230026
摘要:
在烟雾腔系统内,辐照甲苯/CH3ONO/NO/空气混合系统,启动甲苯的光氧化反应. 利用同步辐射光电离质谱在线检测甲苯光氧化气相产物,并用气溶胶飞行时间质谱实时测量甲苯光氧化形成的二次有机气溶胶粒子. 实验结果表明,呋喃、甲基乙二醛,2-甲基呋喃、苯甲醛、甲基酚和苯甲酸是甲苯光氧化反应形成的气体相和粒子相的主要产物,而乙二醛、2-羟基-3-氧代-丁醛、硝基甲苯和甲基硝基酚只存在粒子相.
关键词:  甲苯,二次有机气溶胶,烟雾腔,光电离,反应机理
DOI:10.1088/1674-0068/24/06/672-678
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