Selectivity assessment of DB-200 and DB-VRX open-tubular capillary columns

The solvation parameter model is used to study the influence of composition and temperature on the selectivity of two poly(siloxane) stationary phases used for open-tubular capillary column gas chromatography. ne poly(methylt rifluoropropyldimethylsiloxane) stationary phase, DB-200, has low cohesion, intermediate dipolarity/polarizability, low hydrogen-bond basicity. no hyd rogen-bond acidity, and repulsive electron lone pair interactions. The DB-V RX stationary phase has low cohesion, low dipolarity/polarizability, low hy drogen-bond basicity and no hydrogen-bond acidity and no capacity for elect ron lone pair interactions. The selectivity of the two stationary phases is complementary to those in a database of I I stationary phase chemistries d etermined under the same experimental conditions. (C) 2001 Published by Els evier Science B.V.