Real-time measurements of chemical compositions of secondary organic aerosol and analysis of reaction mechanisms using Single Aerosol Laser Mass Spectrometer Online publication date: Thu, 16-Jul-2009
by Liqing Hao, Zhenya Wang, Mingqiang Huang, Li Fang, Weijun Zhang
International Journal of Environment and Pollution (IJEP), Vol. 39, No. 1/2, 2009
Abstract: A home-made Single Aerosol Laser Mass Spectrometer (SALMS) was utilised to provide on-line measurements of the sizes and molecular compositions of Secondary Organic Aerosols (SOAs) from irradiating toluene in the smog chamber. Results demonstrate that variations in reaction conditions make a little difference in the size and chemical composition distributions of SOAs. According to the reaction mechanisms, some aromatic ring-retaining and ring-opening products have been tentatively identified. Compounds from the H-abstraction pathways contribute more to the aromatic ring-reserved products. Those ring opening products could be produced from OH-addition pathways via two important intermediate species 6-oxo-2,4-heptadienal and 5-methyl-6-oxo-2,4-hexadienal isomers.
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