Počet záznamů: 1  

Selected Ion Flow-Drift Tube Mass Spectrometry: Quantification of Volatile Compounds in Air and Breath

  1. 1.
    SYSNO ASEP0454143
    Druh ASEPJ - Článek v odborném periodiku
    Zařazení RIVJ - Článek v odborném periodiku
    Poddruh JČlánek ve WOS
    NázevSelected Ion Flow-Drift Tube Mass Spectrometry: Quantification of Volatile Compounds in Air and Breath
    Tvůrce(i) Spesyvyi, Anatolii (UFCH-W) ORCID
    Smith, D. (GB)
    Španěl, Patrik (UFCH-W) RID, ORCID
    Zdroj.dok.Analytical Chemistry - ISSN 0003-2700
    Roč. 87, č. 24 (2015), s. 12151-12160
    Poč.str.10 s.
    Jazyk dok.eng - angličtina
    Země vyd.US - Spojené státy americké
    Vědní obor RIVCF - Fyzikální chemie a teoretická chemie
    CEPGA13-28882S GA ČR - Grantová agentura ČR
    Institucionální podporaUFCH-W - RVO:61388955
    UT WOS000366871500030
    EID SCOPUS84950140884
    AnotaceA 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.
    PracovištěÚstav fyzikální chemie J.Heyrovského
    KontaktMichaela Knapová, michaela.knapova@jh-inst.cas.cz, Tel.: 266 053 196
    Rok sběru2016
Počet záznamů: 1