Capillary furnace for improved peak resolution in gas isotope chromatography
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United States of America Patent
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Jul 21, 1998
Grant Date -
N/A
app pub date -
Jan 31, 1997
filing date -
Jan 31, 1997
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Abstract
An isotope ratio monitoring gas chromatograph-mass spectrometer (irm-GC/MS) unit for generating a chromatogram having improved resolution for peaks representative of individual carbon dioxide isotopes measured when a complex GC amenable organic sample (e.g. petroleum hydrocarbons) is combusted in the presence of a metal catalyst. The present irm-GC/MS unit is similar to known irm-GC/MS units of this type except it uses a capillary combustion tube in the furnace which is connected to the capillary column and has approximately the same inside diameter as that of the capillary column (e.g. 0.25 mm I.D.) whereby any 'dead volume' attributable to the combustion tube is substantially eliminated.
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