Abstract
In this study, organic solvents at temperatures higher than their normal boiling points were used as mobile phases for packed capillary column chromatography. No restrictor or back pressure was imposed on the column outlet. As a result, a large difference in mobile-phase properties existed, and a phase transformation from liquid to gas occurred, along the column. Solvating gas chromatography (SGC) was used to characterize this chromatographic process because, near the column outlet, a gaseous mobile phase existed. Chromatographic performance characteristics including mobile-phase flow, column efficiency, mobile-phase solvating power, and solute retention were investigated using fused-silica capillary columns packed with microparticles (5- and 10-μm diameters). It was found that when the temperature was increased to values that were higher than the normal mobile-phase boiling point, the mobile-phase linear velocity increased rapidly at constant column inlet pressure. Although large differences in mobile-ph...
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