Isotopic composition analyzer

Details Isotopic composition analyzer Isotopic composition analyzer

G - Physics

01

N

358/9

G01N 30/00 (2006.01) B01D 59/44 (2006.01) G01N 1/28 (2006.01) G01N 30/84 (2006.01) H01J 49/04 (2006.01) G01N 30/46 (2006.01) G01N 30/72 (2006.01) G01N 31/12 (2006.01)

Patent

CA 2025729

The invention comprises an on-line mass spectrometric method and apparatus for the determination of the isotopic composition of at least oxygen, hydrogen and nitrogen in a compound or mixture of compounds. A mixture contained in syringe 6 is injected through injector 7 on a chromatographic column 1. Compounds eluting from the column 1 pass into a catalytic reactor 14 (typically a platinum\rhodium capillary tube containing elemental carbon and maintained at 1200°C) and are decomposed to produce carbon monoxide, molecular nitrogen, and molecular hydrogen. These gases are analyzed by an isotope-ratio mass spectrometer 4 so that the isotopic composition of the oxygen, nitrogen and hydrogen comprised in the original compound can be determined. A second chromatographic column 24 may be provided to separate carbon monoxide and nitrogen before they are passed into the spectrometer 4, thereby allowing a low resolution spectrometer to be used for the analysis of both gases at m/e 28 daltons.

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