B - Operations – Transporting – 01 – D
Patent
B - Operations, Transporting
01
D
358/9
B01D 59/44 (2006.01) H01J 49/04 (2006.01)
Patent
CA 1205211
ABSTRACT OF THE DISCLOSURE The invention relates to a mass spectrometry method for determining the absolute value of a given isotopic ratio of an unknown sample and/or the differ- ence of isotope content between an unknown sample and a reference, which comprises a) obtaining with or without chemical reaction a substrate capable of providing a fragmentation characteristic of the presence or absence of a specified isotope and usable to retrace the parent ions by the metastable ions technique consisting of accelerating voltage scan, b) introducing said substrate into the source of a mass spectrometer followed by the ionization of said substrate, c) retracing with meta- stable ions technique the parent ions of a daughter ion resulting from the loss of a neutral fragment character- istic of the presence or absence of the specified isotope in the substrate, d) comparing the relative intensities, as expressed by peak areas or heights, of the metastable transitions between, first, said daughter ion and the substrate parent ion, and second, said daughter ion and a transition characteristic of another isotope of well known abundance and usable as internal reference.
426014
Goudreau Gage Dubuc
Universite de Sherbrooke
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