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A New Analytical Method for Measuring Hydrogen Isotopes Using GC-IRMS: Applications to Hydrous Minerals

Abstract A new analytical method is proposed for measuring the deuterium to hydrogen ratio (D/H) of non-stoichiometric water in hydrous minerals via pyrolysis facilitated gas-chromatography - isotope ratio mass spectrometry (GC-IRMS). Previously published analytical methods have reported a poorly understood nonlinear dependence of D/H on sample size, for which any accurate correction is difficult. This sample size effect been variously attributed to kinetic isotope fractionation within the mass spectrometer and peripheral instruments, ion source linearity issues, and an unstable H_3^+-factor or incorrect H_3^+-factor calculations. The cause of the sample size effect is here identified by examinations of individual chromatograms as well as bu... (more)
Created Date 2011
Contributor Sheehan, Michael Robert (Author) / Knauth, Leroy P (Advisor) / Anbar, Ariel (Committee member) / Farmer, Jack (Committee member) / Arizona State University (Publisher)
Subject Geochemistry / Geotechnology / Geology / Chromatography / Continuous / Flow / Hydrogen / Isotope / Pyrolysis
Type Masters Thesis
Extent 125 pages
Language English
Reuse Permissions All Rights Reserved
Note M.S. Geological Sciences 2011
Collaborating Institutions Graduate College / ASU Library
Additional Formats MODS / OAI Dublin Core / RIS

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Description Dissertation/Thesis