Selectivity assessment of popular stationary phases for open-tubular column gas chromatography

The solvation parameter model is used to study the influence of temperature and composition on the selectivity of nine poly(siloxane) and two poly(eth ylene glycol) stationary phase chemistries for open-tubular column gas chro matography. A database of system constants for the temperature range 60-140 degreesC was constructed from literature values with additional results de termined for HP-50+, DB-210, DB-1701, DB-225 and SP-2340 columns. The gener al contribution of monomer composition (methyl, phenyl, cyanopropyl, and tr ifluoropropyl substituents) on the capacity of poly(siloxane) stationary ph ases for dispersion, electron lone pair, dipole-type and hydrogen-bond inte ractions is described. The selectivity coverage of the open-tubular column stationary phases is compared with a larger database for packed column stat ionary phases at a reference temperature of 120 degreesC. 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 stati onary phases. Deficiencies are noted in the coverage of electron lone pair interactions. None of the open-tubular column stationary phases are hydroge n-bond acids. The system constants are shown to change approximately linear ly with temperature over the range 60-140 degreesC. The intercepts and slop es of these plots are used to discuss the influence of temperature on stati onary phase selectivity. (C) 2001 Elsevier Science BN. All rights reserved.