Atmospheric environment

Size distribution and chemical composition of secondary organic aerosol formed from Cl-initiated oxidation of toluene


Mingqiang Huang , Weijun Zhang , Xuejun Gu , Changjin Hu , Weixiong Zhao , Zhenya Wang , Li Fang

DOI:10.1016/S1001-0742(11)60840-1

Received June 22, 2011,Revised September 23, 2011, Accepted , Available online May 06, 2012

Volume 24,2012,Pages 860-864

Secondary organic aerosol (SOA) formed from Cl-initiated oxidation of toluene was investigated in a home-made smog chamber. The size distribution and chemical composition of SOA particles were measured using aerodynamic particle sizer spectrometer and the aerosol laser time-of-flight mass spectrometer (ALTOFMS), respectively. According to a large number of single aerosol diameter and mass spectra, the size distribution and chemical composition of SOA were obtained statistically. Experimental results showed that SOA particles created by Cl-initiated oxidation of toluene is predominantly in the form of fine particles, which have diameters less than 2.5 m (i.e., PM2.5), and glyoxal, benzaldehyde, benzyl alcohol, benzoquinone, benzoic acid, benzyl hydroperoxide and benzyl methyl nitrate are the major products components in the SOA. The possible reaction mechanisms leading to these products are also proposed.

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