Počet záznamů: 1

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

  1. 1.
    0355628 - UFCH-W 2011 RIV GB eng J - Článek v odborném periodiku
    Dryahina, Kseniya - Smith, D. - Španěl, Patrik
    Quantification of methane in humid air and exhaled breath using selected ion flow tube mass spectrometry.
    Rapid Communications in Mass Spectrometry. Roč. 24, č. 9 (2010), s. 1296-1304 ISSN 0951-4198
    Grant CEP: GA ČR GP203/09/P172; GA ČR GA202/09/0800
    Výzkumný záměr: CEZ:AV0Z40400503
    Klíčová slova: mass spectrometry * SIFT-MS * breath
    Kód oboru RIV: CF - Fyzikální chemie a teoretická chemie
    Impakt faktor: 2.846, rok: 2010

    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.
    Trvalý link: http://hdl.handle.net/11104/0006305