Published:Journal of Chromatographic Science,
ISSN 0021-9665Volume
38, Number 3, March 2000, pp. 129–132
Relative
Molar Response Factors for Thermal Conductivity DetectorsJason
Gislason and Stephen M. Wharry Phillips Petroleum Company, Bartlesville, OK
74004
This paper
describes an investigation into the universal nature of relative molar response
factors for thermal conductivity detectors. Relative molar response factors
are measured on multiple gas chromatographs equipped with thermal conductivity
detectors, and the values are compared with values in the literature. As was
observed previously, relative molar responses obtained on a single instrument
for a homologous series vary linearly with respect to the number of carbon atoms
in the hydrocarbon chain. However, significant differences are observed for
the slope of this line depending on the instrument studied. This contradicts
previous literature results that demonstrated an independence of the relative
molar response with regard to the detector. The current results show that the
calibration of thermal conductivity detectors using literature values for relative
molar response factors could produce significant errors in the concentrations
measured by the laboratory chromatograph.
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