title: Selectivity assessment of popular stationary phases for open-tubular column gas chromatography.
abstract: The solvation parameter model is used to study the influence of temperature and composition on the selectivity of nine poly(siloxane) and two poly(ethylene glycol) stationary phase chemistries for open-tubular column gas chromatography. A database of system constants for the temperature range 60-140 degrees C was constructed from literature values with additional results determined for HP-50+, DB-210, DB-1701, DB-225 and SP-2340 columns. The general contribution of monomer composition (methyl, phenyl, cyanopropyl, and trifluoropropyl substituents) on the capacity of poly(siloxane) stationary phases for dispersion, electron lone pair, dipole-type and hydrogen-bond interactions is described. The selectivity coverage of the open-tubular column stationary phases is compared with a larger database for packed column stationary phases at a reference temperature of 120 degrees C. The open-tubular column stationary phases provide reasonable coverage of the range of dipole-type and hydrogen-bond base interactions for non-ionic packed column stationary phases. Deficiencies are noted in the coverage of electron lone pair interactions. None of the open-tubular column stationary phases are hydrogen-bond acids. The system constants are shown to change approximately linearly with temperature over the range 60-140 degrees C. The intercepts and slopes of these plots are used to discuss the influence of temperature on stationary phase selectivity.
authors: Department of Chemistry, Wayne State University, Detroit, MI 48202, USA. cfp@chem.wayne.edu
authors: C F
authors: CF
authors: Poole
authors: Q
authors: Q
authors: Li
authors: W
authors: W
authors: Kiridena
authors: W W
authors: WW
authors: Koziol
mesh_terms: D002849:Chromatography, Gas / Q000295:instrumentation*; D012680:Sensitivity and Specificity; D013696:Temperature