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An interlaboratory study to test instrument performance of hydrogen dual-inlet isotope-ratio mass spectrometers

Analytical and Bioanalytical Chemistry

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Abstract

An interlaboratory comparison of forty isotope-ratio mass spectrometers of different ages from several vendors has been performed to test 2H/1H performance with hydrogen gases of three different isotopic compositions. The isotope-ratio results (unsufficiently corrected for H3+ contribution to the m/z = 3 collector, uncorrected for valve leakage in the change-over valves, etc.) expressed relative to one of these three gases covered a wide range of values: -630??? to -790??? for the second gas and -368??? to -462??? for the third gas. After normalizing the isotopic abundances of these test gases (linearly adjusting the ?? values so that the gases with the lowest and highest 2H content were identical for all laboratories), the standard deviation of the 40 measurements of the intermediate gas was a remarkably low 0.85???. It is concluded that the use of scaling factors is mandatory for providing accurate internationally comparable isotope-abundance values. Linear scaling for the isotope-ratio scales of gaseous hydrogen mass spectrometers is completely adequate. ?? Springer-Verlag 2001.

Additional Publication Details

Publication type:
Article
Publication Subtype:
Journal Article
Title:
An interlaboratory study to test instrument performance of hydrogen dual-inlet isotope-ratio mass spectrometers
Series title:
Analytical and Bioanalytical Chemistry
Volume
370
Issue:
4
Year Published:
2001
Language:
English
Larger Work Type:
Article
Larger Work Subtype:
Journal Article
Larger Work Title:
Analytical and Bioanalytical Chemistry
First page:
358
Last page:
362
Number of Pages:
5