Measurements by gas chromatography/pyrolysis/mass spectrometry: fundamental conditions in 2H/1H isotope ratio analysis
- 29 January 2002
- journal article
- Published by Wiley in Rapid Communications in Mass Spectrometry
- Vol. 16 (5) , 468-472
- https://doi.org/10.1002/rcm.599
Abstract
Gas chromatography/pyrolysis/isotope ratio mass spectrometry (GC/P/IRMS) is a relatively new method for on‐line determination of 2H/1H isotope ratios. The influence of different parameters on the 2H/1H isotope ratios obtained in GC/P/IRMS has been thoroughly studied using several flavor compounds, such as 5‐nonanone, linalool, menthol, linalyl acetate and 4‐decanolide. The requirement of ‘conditioning’ the pyrolysis reactor to obtain reliable δ2HV−SMOW values is discussed. Furthermore, the influence of the carrier gas flow of the gas chromatograph on the completeness of pyrolysis and subsequently on the δ2HV−SMOW values is investigated in detail. The linear range of the compounds investigated is determined. The results show that calibrating the GC/P/IRMS system with secondary standard substances is absolutely necessary in order to obtain reliable δ2HV−SMOW values. In view of interlaboratory comparability, validation procedures are recommended. Copyright © 2002 John Wiley & Sons, Ltd.Keywords
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