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Quantification of methane in humid air and exhaled breath using selected ion flow tube mass spectrometry

SYSNO ASEP	0355628
Document Type	J - Journal Article
R&D Document Type	Journal Article
Subsidiary J	Článek ve WOS
Title	Quantification of methane in humid air and exhaled breath using selected ion flow tube mass spectrometry
Author(s)	Dryahina, Kseniya (UFCH-W)_{RID, ORCID} Smith, D. (GB) Španěl, Patrik (UFCH-W)_{RID, ORCID}
Source Title	Rapid Communications in Mass Spectrometry. - : Wiley - ISSN 0951-4198 Roč. 24, č. 9 (2010), s. 1296-1304
Number of pages	9 s.
Language	eng - English
Country	GB - United Kingdom
Keywords	mass spectrometry ; SIFT-MS ; breath
Subject RIV	CF - Physical ; Theoretical Chemistry
R&D Projects	GP203/09/P172 GA ČR - Czech Science Foundation (CSF)
	GA202/09/0800 GA ČR - Czech Science Foundation (CSF)
CEZ	AV0Z40400503 - UFCH-W (2005-2011)
UT WOS	000277352700011
DOI	10.1002/rcm.4513
Annotation	In selected ion flow tube mass spectrometry, SIFT-MS, analyses of humid air and breath, it is essential to consider and account for the influence of water vapour in the media, which can be profound for the analysis of some compounds, including H2CO, H2S and notably CO2. To date, the analysis of methane has not been considered, since it is known to be unreactive with H3O+ and NO+, the most important precursor ions for SIFT-MS analyses, and it reacts only slowly with the other available precursor ion, O-2(+). However, we have now experimentally investigated methane analysis and report that it can be quantified in both air and exhaled breath by exploiting the slow O-2(+)/PCH4 reaction that produces CH3O2+ ions. We show that the ion chemistry is significantly influenced by the presence of water vapour in the sample, which must be quantified if accurate analyses are to be performed.
Workplace	J. Heyrovsky Institute of Physical Chemistry
Contact	Michaela Knapová, michaela.knapova@jh-inst.cas.cz, Tel.: 266 053 196
Year of Publishing	2011

Number of the records: 1