Characterization of particulate products for aging of ethylbenzene secondary organic aerosol in the presence of ammonium sulfate seed aerosol.
Aging of secondary organic aerosol (SOA) particles formed from OH- initiated oxidation of ethylbenzene in the presence of high mass (100-300μg/m(3)) 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.
College of Chemistry & Environment, Minnan Normal University, Zhangzhou 363000, China; Fujian Province Key Laboratory of Modern Analytical Science and Separation Technology, Zhangzhou 363000, China; Department of Environmental Science and Engineering, Xiamen University, Tan Kah Kee College, Zhangzhou 363105, China. Electronic address: huangmingqiang@gmail.com.
Mingqiang
M
Huang
College of Chemistry & Environment, Minnan Normal University, Zhangzhou 363000, China.
Jiahui
J
Zhang
College of Chemistry & Environment, Minnan Normal University, Zhangzhou 363000, China; Fujian Province Key Laboratory of Modern Analytical Science and Separation Technology, Zhangzhou 363000, China.
Shunyou
S
Cai
Department of Environmental Science and Engineering, Xiamen University, Tan Kah Kee College, Zhangzhou 363105, China.
Yingmin
Y
Liao
Laboratory of Atmospheric Physico-Chemistry, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China.
Weixiong
W
Zhao
Laboratory of Atmospheric Physico-Chemistry, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China.
Changjin
C
Hu
Laboratory of Atmospheric Physico-Chemistry, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China.
Xuejun
X
Gu
Laboratory of Atmospheric Physico-Chemistry, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China.
Li
L
Fang
Laboratory of Atmospheric Physico-Chemistry, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China. Electronic address: wjzhang@aiofm.ac.cn.
Weijun
W
Zhang
D000336:Aerosols / Q000737:chemistry*; D000393:Air Pollutants / Q000737:chemistry*; D000645:Ammonium Sulfate / Q000737:chemistry*; D001555:Benzene Derivatives / Q000737:chemistry*; D008956:Models, Chemical; D010084:Oxidation-Reduction
D000336:Aerosols; D000393:Air Pollutants; D001555:Benzene Derivatives; C004912:ethylbenzene; D000645:Ammonium Sulfate
(NH(4))(2)SO(4) seed aerosol; Aging mechanism; Ethylbenzene; Fuzzy clustering (FCM) algorithm; Laser desorption/ionization; Secondary organic aerosol