Published:Journal of Chromatographic Science, ISSN 0021-9665Volume 41, Number 9, October 2003, pp. 467-474

Mathematical Models of Solute Retention in Gas Chromatography as Sources of Thermodynamic Data. Part III. Alkylbenzenes as the Test Analytes

Katarzyna Ciazynska-Halarewicz and Teresa Kowalska*
Institute of Chemistry, Silesian University, 9 Szkolna Street, 40-006 Katowice, Poland

Direct determination of thermodynamic data has always been a complicated and troublesome experimental task. Gas chromatography is among long-established working tools well suited to performing this particular task indirectly. Our own results were first presented in the papers by Ciazynska-Halarewicz and Kowalska (1,2), and this article is Part III in the series. Present experiments are carried out on low- and medium-polarity stationary phases at five different temperatures ranging from 323K to 423K. They enable determination of two thermodynamic properties of the alkylbenzenes, molar enthalpy of vaporization (DHvap), and the chemical potential of partitioning of the methylene group between the two phases of the chromatographic system (Dµp(–CH2–)). These properties are obtained from eight nonempirical models and, as is apparent from their derivation (3–7), the terms of the models have clearly defined physical meaning, which enables calculation of thermodynamic properties.

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