A reference gas inlet module for internal isotopic calibration in high precision gas chromatography/combustion-isotope ratio mass spectrometry

✍ Scribed by W. Meier-Augenstein

• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 117 KB
• Volume: 11
• Category: Article
• ISSN: 0951-4198
• DOI: 10.1002/(sici)1097-0231(19971030)11:16<1775::aid-rcm89>3.0.co;2-p

✦ Synopsis

A gas inlet module has been designed to introduce reference gases of any type, inert or combustible, into a gas chromatography/combustion -isotope ratio mass spectrometer (GC/C-IRMS) to overcome problems of mass discrimination occurring in the combustion interface. Its design permits the introduction of a reference gas, combustible or inert, in any position of the chromatogram; reference gas pulses can be positioned close to the analyte peak of interest so that the reference gas peak is subjected to virtually the same physical conditions as the analyte peak. The major advantage is an increase in accuracy of up to 0.4‰ and an increase in precision of up to 0.06‰.