Relative retention or non-reduced relative retention? Which is better suited for prediction of the molar enthalpy of vaporization?

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

Abstrakty

EN

Continuing the cycle of investigations introduced in earlier publications [1–9], in this article we present further applications of capillary gas chromatography to predicting selected thermodynamic data of analytes. We derived two novel mathematical models which couple the chromatographic property, i.e. the relative retention, r, with physicochemical properties, i.e. the boiling point of the analyte, TB, and – depending on the relationship – either the molar volume, Vm, or the molar refraction, Rm. These two non-empirical models assume the general form: r=Aexp(BX + C X/TB) where X = Vm or Rm, and A, B, and C denote physicochemically relevant equation fitting constants. Constants B and C enable calculation of the ther-modynamic property, i.e. the molar enthalpy of vaporization, ΔHvap, for the analytes studied. These equations were tested for three groups of analytes of different polarity (alkylbenzenes, aldehydes, and ketones). The empiri-cal chromatographic data were collected in isothermal mode with three capillary columns coated with low- and the medium-polarity stationary phases at five different temperatures ranging from 323 to 423K. After sta-tistical data processing, derived numerical values of the molar enthalpy of vaporization were compared with data taken from the literature to test the fitting and the predictive performance of the novel non-empirical models..

• Wydawca: University of Silesia in Katowice ; Akademiai Kiado
• Czasopismo: Acta Chromatographica
• Rocznik: 2005
• Tom: No. 15
• Strony: 97--118
• Opis fizyczny: Bibliogr. 16 poz., 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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