Radiant energy – Ionic separation or analysis – Methods
Patent
1988-08-31
1990-04-10
Berman, Jack I.
Radiant energy
Ionic separation or analysis
Methods
250288, 436173, B01D 5944
Patent
active
049163132
ABSTRACT:
The invention provides a method and apparatus for the mass spectrometric determination of the isotopic composition of an element comprised in a sample by gas chromatography-isotopic ratio mass spectrometry. As a sample elutes from the column of the gas chromatograph it enters a sample conversion means which converts the element to an analysis gas (a gas comprising the element in elemental form or in the form of a simple compound, e.g. nitrogen or carbon dioxide) which is admitted into the mass spectrometer only during a second time interval corresponding to the elution of the peak containing the sample from the column. One or more calibration samples of a reference gas are admitted into the spectrometer during first time intervals which do not overlap the second time interval, thereby minimizing the contribution of the analysis gas to the reference gas mass analysis, and vice versa. Various devices are provided to minimize disturbance to the flow of gas into the spectrometer during practice of the method.
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Freedman Philip A.
Guilluy Roger
Hall Keith
Jumeau Elizabeth J.
Pachiaudi Christiane
Berman Jack I.
VG Instruments Group Limited
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