A study of the dependence of the Kováts retention index on the temperature of analysis on stationary phases of different polarity

• Autorzy: Ciążyńska-Halarewicz K. , Kowalska T.
• Języki publikacji: EN

Abstrakty

EN

The dependence of Kováts retention indices on the temperature of GC analysis is not always regular. In some chromatographic systems this dependence is characterized by a readily perceptible minimum [1-3]. To monitor this type of relationship a set of test compounds was selected from among the aldehydes, ketones, and alkylbenzenes and their gas chromato-graphic behaviour was studied on stationary phases of different polarity and over a wide range of working temperatures. For some systems we observed a minimum on the plot of I against Tc. This minimum was not only observed, it was also computationally confirmed by use of the equation I = A + B/Tc + ClnTc, where A, B, and C are terms of the equation with physicochemical significance [2,4 - 6]. On the basis of this equation we were also able to evaluate two thermodynamic magnitudes, the activation enthalpy, ΔH±, and the chemical potential of the partitioning of one methylene group between the two phases of the chromatographic system, μp(CH2), for all the analytes investigated.

• Wydawca: University of Silesia in Katowice ; Akademiai Kiado
• Czasopismo: Acta Chromatographica
• Rocznik: 2003
• Tom: No. 13
• Strony: 69--80
• Opis fizyczny: Bibliogr. 19 poz., rys., tab.

Twórcy

autor

Ciążyńska-Halarewicz K.

• Institute of Chemistry, Silesian University, 9 Szkolna Street, 40-006 Katowice, Poland

autor

Kowalska T.

• Institute of Chemistry, Silesian University, 9 Szkolna Street, 40-006 Katowice, Poland

Bibliografia

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