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Chemical ionization tandem mass spectrometer for the in situ measurement of methyl hydrogen peroxide.

Authors
  • St Clair, Jason M
  • McCabe, David C
  • Crounse, John D
  • Steiner, Urs
  • Wennberg, Paul O
Type
Published Article
Journal
Review of Scientific Instruments
Publisher
American Institute of Physics
Publication Date
Sep 01, 2010
Volume
81
Issue
9
Pages
94102–94102
Identifiers
DOI: 10.1063/1.3480552
PMID: 20886995
Source
Medline
License
Unknown

Abstract

A new approach for measuring gas-phase methyl hydrogen peroxide [(MHP) CH(3)OOH] utilizing chemical ionization mass spectrometry is presented. Tandem mass spectrometry is used to avoid mass interferences that hindered previous attempts to measure atmospheric CH(3)OOH with CF(3)O(-) clustering chemistry. CH(3)OOH has been successfully measured in situ using this technique during both airborne and ground-based campaigns. The accuracy and precision for the MHP measurement are a function of water vapor mixing ratio. Typical precision at 500 pptv MHP and 100 ppmv H(2)O is ±80 pptv (2 sigma) for a 1 s integration period. The accuracy at 100 ppmv H(2)O is estimated to be better than ±40%. Chemical ionization tandem mass spectrometry shows considerable promise for the determination of in situ atmospheric trace gas mixing ratios where isobaric compounds or mass interferences impede accurate measurements.

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