Influence of the Combustion Interface Using Auxiliary Gas on the Carbon Isotope Analysis of Organic Compounds

doi:10.3969/j.issn.0251-0790.2012.04.014

Abstract

Abstract: Combustion reactor is considered to be one of the critical factors in detecting sensitivity and resolution of organic compounds for carbon isotope analysis, yet the reasons are not well understood. This study focused on combustion reactors using additional auxiliary gas, one of the two most commonly used reactors applied in commercial instruments. Various alkanes and aromatic compounds were subjected to carbon isotope analysis with several types of combustion reactor to illustrate in detail the effects of the reactor on the chromatography of organic compounds. Relatively small quantities of catalyst packed into the reactor, which result in a high linear velocity of carrier gas and an eliminated diffusional broadening of the analytes in the reactor, could improve the peak resolutions of various compounds. However, the improvements could be gained on the peak resolutions, by various types of reactors, are limited. In comparison, the sensitivities for organic compounds might vary greatly with a number of factors, which is mainly attributed to the changes in split ratio at the open split that is closely related with the total flow rate of carrier gas in the reactor.

Key words: Sensitivity, Peak resolution, Combustion interface, Auxiliary gas, Carbon isotope analysis

CLC Number:

O657.63

TrendMD:

JIA Wang-Lu, LIU Jin-Zhong, PENG Ping-An. Influence of the Combustion Interface Using Auxiliary Gas on the Carbon Isotope Analysis of Organic Compounds[J]. Chem. J. Chinese Universities, 2012, 33(04): 718.

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Influence of the Combustion Interface Using Auxiliary Gas on the Carbon Isotope Analysis of Organic Compounds

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