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Routine analysis by high precision gas chromatography mass selective detector isotope ratio mass spectrometry to 0.1 parts per mil

Hall, J.A. and Barth, J.A.C. and Kalin, R. (1999) Routine analysis by high precision gas chromatography mass selective detector isotope ratio mass spectrometry to 0.1 parts per mil. Rapid Communications in Mass Spectrometry, 13 (13). pp. 1231-1236.

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Abstract

Stable isotope methods are potentially quite useful for validating natural or enhanced mineral degradation of contaminants, For this reason, a continuous flow gas chromatograph (GC), isotope ratio mass spectrometer (IRMS) has been coupled with a quadrupole mass selective detector (MSD) to allow simultaneous mass spectral and stable carbon isotope ratio data to be obtained from a single chromatographic analysis. This allows the target contaminant and any extra-cellular degradation intermediates to be both qualified and quantified. Previously acceptable limits of precision (0.3 parts per mil) are undesirable given the small fractionation observed during aerobic degradation. To further understand the fate of organic contaminants and to gain information about the metabolic degradative pathway employed by a microorganism, routine isotopic analyses on a range of analytes have been performed. Quantities of sample producing mass-44 ion beam signal (I-44) of 2 x 10(-10) fo 1 x 10(-8) A were analysed. When the IRMS was tuned for high sensitivity, ion source nonlinearities were overcome by peak height correction from an algorithm that was produced using known isotopic standards of varying concentrations. This led to sample accuracy of <0.01 parts per thousand and sample precision of 0.1 parts per thousand. Copyright (C) 1999 John Wiley & Sons, Ltd.

Item type: Article
ID code: 38103
Notes: Annual Meeting on the Stable Isotope Mass Spectrometry Users Group (SIMSUG), EXETER, ENGLAND, JAN 19-20, 1999
Keywords: gas chromatography , mass spectrometry, Engineering (General). Civil engineering (General), Organic Chemistry, Spectroscopy, Analytical Chemistry
Subjects: Technology > Engineering (General). Civil engineering (General)
Department: Faculty of Engineering > Civil and Environmental Engineering
Related URLs:
    Depositing user: Pure Administrator
    Date Deposited: 02 Mar 2012 13:34
    Last modified: 05 Sep 2014 01:03
    URI: http://strathprints.strath.ac.uk/id/eprint/38103

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