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Corrected equation for the concentrations in the drift tube of a proton transfer reaction-mass spectrometer (PTR-MS).

Int. J. Mass Spectrom. 264, 92-95 (2007)
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A corrected equation for the concentrations in the drift tube of a proton transfer reaction-mass spectrometer (PTR-MS) is presented which accounts for the different mobility of primary ions and protonated analyte previous termvolatilenext term organic compounds (VOCs). As a consequence, the calculation of VOC concentrations from the measured count rates requires as well a correction factor, equalling the ratio of (i) the mobility of the protonated analyte VOCs to (ii) the mobility of the gases used to determine the transmission efficiency. However, such data do essentially not exist for the relevant VOCs. Published mobility data for small inorganic ions suggest that the correction can be larger than 20% and hence be a significant contribution to the overall accuracy of calculated concentrations. The correction emphasises the need to calibrate the PTR-MS in order to determine VOC concentrations accurately.
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Publikationstyp Artikel: Journalartikel
Dokumenttyp Wissenschaftlicher Artikel
Schlagwörter Proton transfer reaction-mass spectrometry; previous termVolatile organic compounds
ISSN (print) / ISBN 1387-3806
e-ISSN 1873-2798
Quellenangaben Band: 264, Heft: 1, Seiten: 92-95 Artikelnummer: , Supplement: ,
Verlag Elsevier
Begutachtungsstatus Peer reviewed