Temperature dependence of Kováts indices in gas chromatography. Statistical and thermodynamic verification of a "kinetic" model

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

Abstrakty

EN

In this paper we present a new model of describing the temperature-dependence of Kováts retention indices. It is regarded as a "kinetic" model, because it uses certain elements of chemical kinetics (e.g. the enthalpy and entropy of activation, ΔH≠ and ΔS≠) for thermodynamic description of retention processes in gas chromatography. It was founded on the transition-state theory (TST) and involves the Eyring equation. Mathematically it can be considered as an extended Antoine-type equation, although it surpasses that relationship owing to its greater flexibility and hence its better fitting of experimental results. It also anticipates the physical minima which occasionally occur when retention indices are plotted against the measure-ment temperature.

• Wydawca: University of Silesia in Katowice ; Akademiai Kiado
• Czasopismo: Acta Chromatographica
• Rocznik: 2002
• Tom: No. 12
• Strony: 65--79
• Opis fizyczny: Bibliogr. 20 poz., rys., tab.

Twórcy

autor

Ciążyńska-Halarewicz K.

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

autor

Borucka E.

• 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

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