Radiant energy – Ionic separation or analysis – Methods
Patent
1988-08-31
1989-09-12
Berman, Jack I.
Radiant energy
Ionic separation or analysis
Methods
250288, 436173, H01J 4904
Patent
active
048662704
ABSTRACT:
The invention comprises methods and apparatus for the mass spectrometric determination of the isotopic composition of an element comprised in an analysis gas (that is, a gas comprising the element in elemental form or in the form of a simple compound, e.g., nitrogen or carbon dioxide). First and second flows of a carrier gas (e.g., helium) are simultaneously passed into the mass spectrometer, and samples of analysis gas and a reference gas are respectively introduced into the first and second flows during selected time intervals. The time intervals are selected so that mass spectrometric measurements are made on the analysis gas samples in the absence of any signal from the reference gas samples, and v.v. A preferred embodiment comprises a gas chroatograph through which a sample containing the element is passed, and conversion means to convert the eluting sample into the analysis gas.
REFERENCES:
patent: 4207465 (1980-06-01), Favre et al.
patent: 4495414 (1985-01-01), Barrie et al.
D. A. Schoeller and J. M. Hays, Computer Controlled Ion Counting Isotope Ratio Mass Spectrometer, Analytical Chemistry 1975 47(3), 408-414.
D. E. Matthews and J. M. Hays, Isotope-Ratio-Monitoring Gas Chromatography Mass Spectrometry Analytical Chemistry 1978, 50 (11), 1465-1473.
A. Barrie, J. Bricout and J. Koziet, Gas Chromatography--Stable Isotope Ration Analysis at Natural Abundance Levels, Biomedical Mass Spectrometry, 1984, 11(11) 583-588.
T. Preston and N. J. P. Owens, Interfacing on Automatic Elemental Analyzer with an Isotope Ratio Mass Spectrometer Analyst, 1983, 108, 971-977.
Freedman Philip A.
Guilluy Roger
Hall Keith
Jumeau Elizabeth J.
Pachiaudi Christiane
Berman Jack I.
VG Instruments Group Limited
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