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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.

Mass Spectral Analysis of the Aged 1,3,5-Trimethylbenzene Secondary Organic Aerosol in the Presence of Ammonium Sulfate Seeds