Temperature dependence of solvation heat capacities by gas chromatography

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6 Citations (Scopus)

Abstract

The temperature dependence of molar solvation heat capacity has been determined in the temperature range of 30-160°C for C6-C 10 n-alkanes and McReynolds test compounds on 100% poly(dimethylsiloxane) (PDMS) FSOT columns using the equations involving the temperature dependence of solvation enthalpy and entropy. The evaluation method is based on a rigorous statistical evaluation of the parameter estimations. On PDMS, column solvation heat capacity versus temperature curves are S-shaped for n-alkanes and for 1-butanol, while the temperature dependence of the other test compounds is more complicated. The results show near monotonous decrease of solvation heat capacity in the whole temperature range. Harmonic oscillator - rigid rotor assumption rationalizes the curves in a simplified way.

Original languageEnglish
Pages (from-to)134-139
Number of pages6
JournalAnalytica Chimica Acta
Volume549
Issue number1-2
DOIs
Publication statusPublished - Sep 6 2005

Keywords

  • Gas chromatography
  • Solvation molar heat capacity
  • Statistical mechanics
  • Temperature dependence

ASJC Scopus subject areas

  • Analytical Chemistry
  • Biochemistry
  • Environmental Chemistry
  • Spectroscopy

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