Abstract
Liquid samples were introduced into an open tubular column supercritical fluid chromatograph (SFC) using a short packed capillary column as a solute focusing device after a typical sample loop valve injector. The packing materials were held inside the capillary by porous ceramic frits. Excess solvent was vented into the atmosphere through the packed capillary. Since the exit end of the packed capillary column was at atmospheric pressure, a density gradient was established along the length of the column and solutes precipitated at the point where the density dropped below the carbon dioxide solvating density for these compounds
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