Chemical composition and size distribution of secondary organic aerosol formed from the photooxidation of isoprene.
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 microm. 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.
Liu
Xianyun
X
Laboratory of Environmental Spectroscopy, Anhui Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Hefei 230031, China. xianyunliu@gmail.com
Zhang
Weijun
W
Wang
Zhenya
Z
Zhao
Weixiong
W
Tao
Ling
L
Yang
Xibin
X
D000336:Aerosols / Q000032:analysis*; D002070:Butadienes / Q000737:chemistry*; D008401:Gas Chromatography-Mass Spectrometry; D045782:Hemiterpenes / Q000737:chemistry*; D010084:Oxidation-Reduction; D010420:Pentanes / Q000737:chemistry*; D055668:Photochemical Processes
D000336:Aerosols; D002070:Butadienes; D045782:Hemiterpenes; D010420:Pentanes; C005059:isoprene