Characterization of particulate products for aging of ethylbenzene secondary organic aerosol in the presence of ammonium sulfate seed aerosol

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• 作者：Mingqiang Huang¹ ; ² ; ³ ; ^{huangmingqiang@gmail.com" class="auth_mail" title="E-mail the corresponding author} ; Jiahui Zhang¹ ; Shunyou Cai¹ ; ² ; Yingmin Liao³ ; Weixiong Zhao⁴ ; Changjin Hu⁴ ; Xuejun Gu⁴ ; Li Fang⁴ ; Weijun Zhang⁴ ; ^{wjzhang@aiofm.ac.cn" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Ethylbenzene ; Secondary organic aerosol ; (NH4)2SO4 seed aerosol ; Laser desorption/ionization ; Fuzzy clustering (FCM) algorithm ; Aging mechanism
• 刊名：Journal of Environmental Sciences
• 出版年：2016
• 出版时间：September 2016
• 年：2016
• 卷：47
• 期：Complete
• 页码：219-229
• 全文大小：1153 K

文摘

Aging of secondary organic aerosol (SOA) particles formed from OH– initiated oxidation of ethylbenzene in the presence of high mass (100–300 μg/m³) concentrations of (NH₄)₂SO₄ seed aerosol was investigated in a home-made smog chamber in this study. The chemical composition of aged ethylbenzene SOA particles was measured using an aerosol laser time-of-flight mass spectrometer (ALTOFMS) coupled with a Fuzzy C-Means (FCM) clustering algorithm. Experimental results showed that nitrophenol, ethyl-nitrophenol, 2,4-dinitrophenol, methyl glyoxylic acid, 5-ethyl-6-oxo-2,4-hexadienoic acid, 2-ethyl-2,4-hexadiendioic acid, 2,3-dihydroxy-5-ethyl-6-oxo-4-hexenoic acid, 1H-imidazole, hydrated N-glyoxal substituted 1H-imidazole, hydrated glyoxal dimer substituted imidazole, 1H-imidazole-2-carbaldehyde, N-glyoxal substituted hydrated 1H-imidazole-2-carbaldehyde and high-molecular-weight (HMW) components were the predominant products in the aged particles. Compared to the previous aromatic SOA aging studies, imidazole compounds, which can absorb solar radiation effectively, were newly detected in aged ethylbenzene SOA in the presence of high concentrations of (NH₄)₂SO₄ seed aerosol. These findings provide new information for discussing aromatic SOA aging mechanisms.