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www.atmos-meas-tech-discuss.net/2/3291/2009/
doi:10.5194/amtd-2-3291-2009
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under the Creative Commons Attribution 3.0 License.
A new technique for the selective measurement of atmospheric peroxy radical concentrations of HO2 and RO2 using denuding method
1Department of Applied Chemistry,Graduate school of Urban Environmental Sciences,Tokyo Metropolitan University 1-1 Minami-Ohsawa, Hachioji, Tokyo 192-0367, Japan
2Laboratoire de Physico-Chimie des Processus de Combustion et de l'Atmosphère, PC2A UMR 8522, Université des Lille1, 59655 Villeneuve d'Ascq Cedex, France
3Department of Chemistry, University of Leicester, Leicester, LE1 7RH, UK
Abstract. A technique for the selective measurement of atmospheric HO2 and RO2 using peroxy radical chemical amplification coupled to laser-induced fluorescence NO2 detection (PERCA-LIF) technique is proposed. By pulling the air through a filled pre-inlet advantage can be taken of the higher heterogeneous loss rate of HO2 relative to CH3O2. Pre-inlet conditions have been found where ca. 90% of HO2 was removed whereas the comparable CH3O2 loss was 15%. The dependence of loss rate on humidity and peroxy radicals' concentration has also been investigated. When using glass beads as the surface for peroxy radical remove, the influence of the relative humidity on the removal efficiency becomes negligible. It may therefore be possible to apply this technique to the measurement of absolute concentrations of solely RO2 as well as the sum of HO2 and RO2. The application of this technique to atmospheric measurements is suggested.
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Notice on Discussion StatusCitation: Miyazaki, K., Parker, A. E., Fittschen, C., Monks, P. S., and Kajii, Y.: A new technique for the selective measurement of atmospheric peroxy radical concentrations of HO2 and RO2 using denuding method, Atmos. Meas. Tech. Discuss., 2, 3291-3307, doi:10.5194/amtd-2-3291-2009, 2009. Bibtex EndNote Reference Manager XML
