Behavior of n-alkanes on poly(oxyethylene) capillary columns - Evaluation of interfacial effects

The solvation behavior of n-alkanes on poly (oxyethylene) was studied emplo ying capillary gas chromatography, Interfacial effects were discriminated a nd evaluated through the analysis of retention data from six commercial fus ed-silica capillary columns, having film thicknesses of 0.15-5 mum. Express ions for the mixed retention mechanism in capillary columns were deduced fr om assumptions of a general character. Partition coefficients were determin ed for the n-alkanes up to 28 carbon atoms, at temperatures ranging from 40 to 240 degreesC. In agreement with other authors, it was observed that int erfacial phenomena contribute poorly to the chromatographic retention, bein g negligible over 140 degreesC for homologues with less than 16 carbons. (C ) 2001 Elsevier Science B.V. All rights reserved.