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Influence of weakly bound adduct ions on breath trace gas analysis by selected ion flow tube mass spectrometry (SIFT-MS)
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SYSNO ASEP 0329748 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Influence of weakly bound adduct ions on breath trace gas analysis by selected ion flow tube mass spectrometry (SIFT-MS) Title Vliv slabě vázaných iontových aduktů na analýzu stopových plynů pomocí hmotnostní spektrometrie v proudové trubici s vybranými ionty (SIFT-MS) Author(s) Španěl, Patrik (UFCH-W) RID, ORCID
Smith, D. (GB)Source Title International Journal of Mass Spectrometry. - : Elsevier - ISSN 1387-3806
Roč. 280, 1-3 (2009), s. 128-135Number of pages 8 s. Language eng - English Country NL - Netherlands Keywords ion-molecule association ; adduct ion ; SIFT-MS ; breath analysis Subject RIV CF - Physical ; Theoretical Chemistry R&D Projects IAA400400702 GA AV ČR - Academy of Sciences of the Czech Republic (AV ČR) CEZ AV0Z40400503 - UFCH-W (2005-2011) UT WOS 000263195500020 DOI 10.1016/j.ijms.2008.07.021 Annotation This paper describes how weakly bound adduct ions form when the precursor ions used in selected ion flow mass spectrometry, SIFT-MS, analyses, viz. H3O+, NO+ and O2+, associate with the major components of air and exhaled breath, N2, O2 and CO2. These adduct ions, which include H3O+N2, H3O+CO2, NO+CO2, O2+O2 and O2+CO2, are clearly seen when dry air containing 5% CO2 (typical of that in exhaled breath) is analysed using SIFT-MS. These adduct ions must not be misinterpreted as characteristic product ions of trace gases; if so, serious analytical errors can result. However, when exhaled breath is analysed these adduct ions are partly removed by ligand switching reactions with the abundant water molecules and the problems they represent are alleviated. But the small fractions of the adduct ions that remain in the SIFT-MS spectra, and especially when they are isobaric with genuine characteristic product ion of breath trace gases, can result in erroneous quantifications; ... Workplace J. Heyrovsky Institute of Physical Chemistry Contact Michaela Knapová, michaela.knapova@jh-inst.cas.cz, Tel.: 266 053 196 Year of Publishing 2010
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