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A technique for the determination of 180/160 and 170/160 isotopic ratios in water from small liquid and solid samples

Baker, L.; Franchi, I.A.; Maynard, J.; Wright, I.P. and Pillinger, C.T. (2002). A technique for the determination of 180/160 and 170/160 isotopic ratios in water from small liquid and solid samples. Analytical Chemistry, 74(7) pp. 1665–1673.

DOI (Digital Object Identifier) Link: http://dx.doi.org/10.1021/ac010509s
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Abstract

We have developed a new technique in which a solid reagent, cobalt(III) fluoride, is used to prepare oxygen gas for isotope ratio measurement from water derived either from direct injection or from the pyrolysis of solid samples. The technique uses continuous flow, isotope ratio monitoring, gas chromatography/mass spectrometry (irmGC/MS) to measure the δ180 and δ17O of the oxygen gas. Water from appropriate samples is evolved by a procedure of stepped pyrolysis (0-1000 °C, typically in 50 °C increments) under a flowing stream of helium carrier gas. The method has considerable advantages over others used for water analysis in that it is quick; requires only small samples, typically 1-50 mg of whole rock samples (corresponding to ~0.2 μmol of H2O); and the reagent is easy and safe to handle. Reproducibility in isotope ratio measurement obtained from pyrolysis of samples of a terrestrial solid standard are δ180 ± 0.54, δ170 ± 0.33, and Δ170 ± 0.10‰, 1 in all cases. The technique was developed primarily for the analysis of meteorites, and the efficiency of the method is illustrated herein by results from water standards, solid reference materials, and a sample of the Murchison CM2 meteorite.

Item Type: Journal Article
Copyright Holders: 2002 American Chemical Society
ISSN: 1520-6882
Academic Unit/Department: Science > Physical Sciences
Interdisciplinary Research Centre: Centre for Earth, Planetary, Space and Astronomical Research (CEPSAR)
Item ID: 6178
Depositing User: Users 6044 not found.
Date Deposited: 15 Feb 2007
Last Modified: 27 Mar 2014 15:49
URI: http://oro.open.ac.uk/id/eprint/6178
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