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Thermodynamic study of alkanes,alkylbenzenes and chloroalkanes retention on alkyl- and cyanoalkyl-bonded stationary phases in supercritical fluid chromatography |
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| Authors: | Hagege A Rocca J L Djerki R |
| Institution: | (1) Service Central d'Analyse, Centre National de la Recherche Scientifique, Boîte Postale 22, 69390 Vernaison, France;(2) Present address: Laboratoire de Chimie Analytique et Minérale, Ecole Européenne des Hautes Etudes des Industries Chimiques de Strasbourg, 1 rue Blaise Pascal, 67008 Strasbourg, France;(3) Laboratoire des Sciences Analytiques, Université Claude Bernard, 69100 Villeurbanne, France;(4) Zentrale Analytik, Ciba-Geigy AG, 4002 Basel, Switzerland |
| Abstract: | Summary The SFC retention behaviour of alkanes, alkylbenzenes and chloroalkane was investigated by studying solute/mobile phase/stationary phase interaction enthalpies. The methylene group and functional group contributions to solute retention were calculated in pure CO2. It was shown that hydrophobic interactions mainly control retention in pure CO2. Interaction between the polar extremity of C10CN ligands and residual OH groups on the silica surface was suggested as an explanation of the retention obtained on such ligands. This was confirmed by experiments carried out with modified CO2. |
| Keywords: | Supercritical-fluid chromatography Interaction enthalpy Bonded stationary phases Retention mechanism Hydrocarbon and chloroalkane homologues |
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