Real-time measurements of chemical compositions of secondary organic aerosol and analysis of reaction mechanisms using Single Aerosol Laser Mass Spectrometer
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.

Online publication date: Thu, 16-Jul-2009

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