Isotopic composition analyzer

Details Isotopic composition analyzer Isotopic composition analyzer

1990-09-18

1994-05-24

Housel, James C.

Chemistry: analytical and immunological testing

Nitrogen containing

436127, 436136, 436145, 436159, 436161, 436173, 250282, B01D 5944

Patent

active

053148274

ABSTRACT:
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 containing carbon 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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