Mass Spectral Analysis of the Aged 1,3,5-Trimethylbenzene Secondary Organic Aerosol in the Presence of Ammonium Sulfate Seeds
Mingqiang Huang1,2, Jun Xu1, Shunyou Cai1, Xingqiang Liu2, Changjin Hu3, Xuejun Gu3, Li Fang3, Weijun Zhang3
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1Fujian Provincial Key Laboratory of Modern Analytical Science and Separation Technology,
College of Chemistry and Environment, Minnan Normal University,
Zhangzhou 363000, China
2Department of Environmental Science and Engineering, Xiamen University,
Tan Kah Kee College, 363105 Zhangzhou, China
3Laboratory of Atmospheric Physico-Chemistry, Anhui Institute of Optics and Fine Mechanics,
Chinese Academy of Sciences, Hefei 230031, China
Online publish date: 2017-06-13
Publish date: 2017-07-25
Submission date: 2016-09-12
Final revision date: 2016-11-05
Acceptance date: 2016-11-06
Pol. J. Environ. Stud. 2017;26(4):1531–1537
The ammonium sulfate ((NH4)2SO4) seed aerosols commonly found in the Chinese urban atmosphere could affect the formation and aging of secondary organic aerosols (SOA). Aging of aromatic SOA is performed using UV-irradiation of 1,3,5-trimethylbenzene (135-TMB)/CH3ONO/NO/air mixtures with high concentrations (~100 μg/m3) of (NH4)2SO4 seeds in the laboratory chamber in this study. The particulate products of SOA were measured using an aerosol laser time-of-flight mass spectrometer (ALTOFMS) in real-time, and fuzzy c-means (FCM) was applied to the mass spectra organic species for clusters. Experimental results indicated that methylglyxoal, 2-methyl-4-oxo-2-pentenal, 4-methyl-1H-imidazole, 4-methyl-imidazole-2-acetaldehyde, and other imidazole derivative compounds are the principal products in the aged particles. Imidazole compounds that can absorb solar radiation effectively were newly detected in the aged 135-TMB SOA with high concentrations of (NH4)2SO4 seed aerosols. These would provide new information for discussing the 135-TMB SOA aging mechanism.