Atmospheric environment

Chemical composition and size distribution of secondary organic aerosolformed from the photooxidation of isoprene

LIU Xianyun , ZHANG Weijun , WANG Zhenya , ZHAO Weixiong , TAO Ling , YANG Xibin


Received January 18, 2009,Revised May 27, 2009, Accepted , Available online

Volume 21,2009,Pages 1525-1531

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Photooxidation of isoprene leads to the formation of secondary organic aerosol (SOA). In this study, the chemical composition of SOA formed from OH-initiated photooxidation of isoprene has been investigated with gas chromatography/mass spectrometry (GC/MS) and a home-made aerosol time-of-flight mass spectrometer. Sampling particles generated in a home-made smog chamber. The size distribution of SOA particles was detected by a TSI 3321 aerodynamic particle size spectrometer in real time. Results showed that SOA created by isoprene photooxidation was predominantly in the form of fine particles, which have diameters less than 2.5 m. The obtained mass spectra of individual particles show that products of the OH-initiated oxidation of isoprene contain methyl vinyl ketone, methacrolein, formaldehyde, and some other hydroxycarbonyls. The possible reaction mechanisms leading to these products were also discussed.

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