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NRC Publications Archive Archives des publications du CNRCThis publication could be one of several versions: author's original, accepted manuscript or the publisher's version. / La version de cette publication peut être l'une des suivantes : la version prépublication de l'auteur, la version acceptée du manuscrit ou la version de l'éditeur. For the publisher's version, please access the DOI link below./ Pour consulter la version de l'éditeur, utilisez le lien DOI ci-dessous.http://doi.org/10.1039/b505309aJournal of Analytical Atomic Spectrometry, 20, 12, pp. 1358Spectrometry, 20, 12, pp. -1364Spectrometry, 20, 12, pp. , 2005 Isotope ratio precision with transient sample introduction using ICP orthogonal acceleration time-of-flight mass spectrometry An assessment of inductively coupled plasma orthogonal acceleration time-of-flight mass spectrometry (ICP-oa-TOF-MS) for measurement of isotope ratios arising from steady-state and transient signal detection is presented. An HPLC pump and autosampler were used to introduce microliter volumes of analyte solution into a carrier flow to generate precise and repeatable transient signals having a FWHM of approximately 1 s. Analog and pseudo pulse data processing modes were evaluated and found to obey Poisson statistics for prediction of isotope ratio performance. Use of pseudo pulse counting is restricted by the limited linear range of response and cannot exceed approximately 0.2 counts per pushout. This limitation does not impede analog detection, which thus permits precise isotope ratio measurements to be achieved at higher analyte concentrations using sho...