Abstract
The possibilities of turbulent flow capillary gas chromatography for increasing the speed of analysis were examined by use of previously developed sample introduction, detection and registration systems, which are compatible with peak widths in the millisecond range. Existing theoretical models for axial turbulent dispersion in capillary columns were evaluated experimentally. Substantially decreases in reduced plate heights were obtained (h < 1) for unretained components at an average linear velocity of 15 m/s for column diameters of 320 μm. Unfortunately, the plate height increased greatly with increasing solute capacity factor (by a factor 15 from k=0 to k=1). Comparison with theoretical models shows that this effect is mainly due to mobile phase mass transfer. Therefore, the gain in analysis speed is limited to low capacity factors. In addition the pressure drop required is considerably higher than for a comparable improvement in speed obtained by decreasing the column inside diameter.
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