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Selected Ion Flow-Drift Tube Mass Spectrometry: Quantification of Volatile Compounds in Air and Breath
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SYSNO ASEP 0454143 Document Type J - Journal Article R&D Document Type Journal Article Subsidiary J Článek ve WOS Title Selected Ion Flow-Drift Tube Mass Spectrometry: Quantification of Volatile Compounds in Air and Breath Author(s) Spesyvyi, Anatolii (UFCH-W) ORCID, RID
Smith, D. (GB)
Španěl, Patrik (UFCH-W) RID, ORCIDSource Title Analytical Chemistry. - : American Chemical Society - ISSN 0003-2700
Roč. 87, č. 24 (2015), s. 12151-12160Number of pages 10 s. Language eng - English Country US - United States Keywords TRACE GAS-ANALYSIS ; SIFT-MS ; PTR-MS Subject RIV CF - Physical ; Theoretical Chemistry R&D Projects GA13-28882S GA ČR - Czech Science Foundation (CSF) Institutional support UFCH-W - RVO:61388955 UT WOS 000366871500030 EID SCOPUS 84950140884 DOI 10.1021/acs.analchem.5b02994 Annotation A selected ion flow-drift tube mass spectrometric analytical technique, SIFDT-MS, is described that extends the established selected ion flow tube mass spectrometry, SIFT-MS, by the inclusion of a static but variable E-field along the axis of the flow tube reactor in which the analytical ion molecule chemistry occurs. The ion axial speed is increased in proportion to the reduced field strength E/N (N is the carrier gas number density), and the residence/reaction time, t, which is measured by Hadamard transform multiplexing, is correspondingly reduced. To ensure a proper understanding of the physics and ion chemistry underlying SIFDT-MS, ion diffusive loss to the walls of the flow-drift tube and the mobility of injected H3O+ ions have been studied as a function of E/N. It is seen that the derived diffusion coefficient and mobility of H3O+ ions are consistent with those previously reported. The rate coefficient has been determined at elevated E/N for the association reaction of the H3O+ reagent ions with H2O molecules, which is the first step in the production of H3O+(H2O)(1,2,3) reagent hydrate ions. The production of hydrated analyte ion was also experimentally investigated. The analytical performance of SIFDT-MS is demonstrated by the quantification of acetone and isoprene in exhaled breath. Finally, the essential features of SIFDT-MS and SIFT-MS are compared, notably pointing out that a much lower speed of the flow-drive pump is required for SIFDT-MS, which facilitates the development of smaller cost-effective analytical instruments for real time breath and fluid headspace analyses. Workplace J. Heyrovsky Institute of Physical Chemistry Contact Michaela Knapová, michaela.knapova@jh-inst.cas.cz, Tel.: 266 053 196 Year of Publishing 2016
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