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www.atmos-meas-tech-discuss.net/2/1351/2009/
doi:10.5194/amtd-2-1351-2009
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A laboratory flow reactor with gas particle separation and on-line MS/MS for product identification in atmospherically important reactions
1Department of Chemistry and Centre for Atmospheric Chemistry, York University, 4700 Keele St., Toronto, Ontario, M3J 1P3, Canada
*now at: Université Paris Descartes – CNRS UMR 8601, Paris, France
Abstract. A system to study the gas and particle phase products from gas phase hydrocarbon oxidation is described. It consists of a gas phase photochemical flow reactor followed by a diffusion membrane denuder to remove gases from the reacted products, or a filter to remove the particles. Chemical analysis is performed by an atmospheric pressure chemical ionization (APCI) triple quadrupole mass spectrometer. A diffusion membrane denuder is shown to remove trace gases to below detectable limits so the particle phase can be studied. The system was tested by examining the products of the oxidation of m-xylene initiated by HO radicals. Dimethylphenol was observed in both the gas and particle phases although individual isomers could not be identified. Two furanone isomers, 5-methyl-2(3H)furanone and 3-methyl-2(5H)furanone were identified in the particulate phase, but the isobaric product 2,5 furandione was not observed. One isomer of dimethyl-nitrophenol was identified in the particle phase but not in the gas phase.
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Citation: Bennett, J. F., Collin, F., and Hastie, D. R.: A laboratory flow reactor with gas particle separation and on-line MS/MS for product identification in atmospherically important reactions, Atmos. Meas. Tech. Discuss., 2, 1351-1382, doi:10.5194/amtd-2-1351-2009, 2009. Bibtex EndNote Reference Manager XML
