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Mass spectral analysis of the aged 1,3,5-trimethylbenzene secondary organic aerosol in the presence of ammonium sulfate seeds

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Huang M., Xu J., Cai S., Liu X., Hu C., Gu X., Fang L., Zhang W.

Polish Journal of Environmental Studies

2017

tom 26

nr 4

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.

Ograniczanie wyników

1 Polish Journal of Environmental Studies

1 Cai S.

1 Fang L.

1 Gu X.

1 Hu C.

1 Huang M.

1 Liu X.

1 Xu J.

1 Zhang W.

1 2017

Wyniki wyszukiwania

Mass spectral analysis of the aged 1,3,5-trimethylbenzene secondary organic aerosol in the presence of ammonium sulfate seeds