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          Institute: MPI für Kernphysik     Collection: Physics of Atmospheric Molecular Processes     Display Documents

ID: 27814.0, MPI für Kernphysik / Physics of Atmospheric Molecular Processes
Atmospheric peroxy radicals: ROXMAS, a new mass-spectrometric methodology for speciated measurements of HO2 and Sigma RO2 and first results
Authors:Hanke, M.; Uecker, J.; Reiner, T.; Arnold, F.
Date of Publication (YYYY-MM-DD):2002-02-01
Title of Journal:International Journal of Mass Spectrometry
Journal Abbrev.:Int. J. Mass Spectrom.
Issue / Number:2-3
Start Page:91
End Page:99
Review Status:Peer-review
Audience:Experts Only
Abstract / Description:ROXMAS (ROx Chemical Conversion/CIMS), a novel method for atmospheric speciated measurements of HO2 and the sum of organic peroxy radicals (SigmaRO(2)) developed by MPI-K, has been successfully deployed in a field campaign on Monte Cimone, Italy, June-July 2000. The method relies on amplifying chemical conversion of peroxy radicals to gaseous sulfuric acid via the chain reaction with NO and SO2 and detection of the sulfuric acid by CIMS. Speciated measurements have been realized by diluting atmospheric air in either N-2 or O-2 buffer, thus exploiting the dependence of the conversion efficiency of RO2 to HO2 on [O-2], [NO], and [SO2]. Speciated measurements of HO2 and RO2 are required to provide further insight into radical partitioning and thus to elucidate further the mechanisms of the oxidation of volatile organic compounds in the troposphere. This methodology yields useful speciated results for atmospheric conditions where CH3O2 makes a major contribution to total RO2. Under other conditions it gives an upper limit for [O-2] and a lower limit for [SigmaRO(2)]. (Int J Mass Spectrom 213 (2002) 91-99) (C) 2002 Elsevier Science B.V.
Free Keywords:ROXMAS; chemical flow reactor; chemical ionization mass spectrometry (CIMS); HO2 radical; RO2 radical; atmospheric speciated measurements
External Publication Status:published
Document Type:Article
Affiliations:MPI für Kernphysik/Group K. Mauersberger/Atmospheric Trace Gas Environmental Physics (F. Arnold)
Identifiers:ISI:000174319000001 [ID No:1]
ISSN:1387-3806 [ID No:2]
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