Classification and comparison of capillary columns by determination of the solution enthalpy of polar and non polar probes

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• 作者：S. Vezzani ; P. Moretti and G. Castello
• 关键词：Polarity ; Stationary phases ; Enthalpy ; Retention mechanism ; Polyglycols ; Polydimethylsiloxane ; 1-Alcohols ; n-Alkanes
• 刊名：Journal of Chromatography A
• 出版年：2006
• 期刊代码：47_00219673
• 类别：ch
• 出版时间：6 January 2006
• 卷：1101
• 期：1-2
• 页码：261-267
• 文件大小：166 K

摘要

The behaviour and separation characteristics of capillary columns containing different stationary phases (bonded methyl- and methylphenylsiloxanes and polyglycols, and carbon layer and porous polymer) were classified and compared by measuring the values of the solution enthalpy ΔH_s of n-alkanes and 1-alcohols at various temperatures. The difference in ΔH_s values between straight-chain 1-alcohols and n-alkanes with the same number of carbon atom (ΔΔH_s) does not change with changing temperature when gas–liquid partition stationary phases are used, but depends on the column composition and polarity and therefore permits to evaluate the influence of polarity on the solute–solvent interaction. The trend of the ΔΔH_s values is correlated with that of the ΔC parameter and with the McReynolds’ polarity constants.