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A series of experiments is performed to determine the effect of adding a modifier to the collection solvent when using liquid trapping with direct restrictor immersion after supercritical fluid extraction. The addition of a modifier to the collection solvent allows the trapping efficiencies of a polarity test mix obtained at higher temperatures to approach those obtained at lower temperatures. Collection pressurization is found to increase both the recovery and precision for all analytes. The selection of both modifier and collection solvent is discussed, with emphasis on changing the physical properties (surface tension, viscosity, and boiling point) of the collection solvent.

Modification of the Collection Solvent to Enhance Liquid Trapping Efficiencies After Supercritical Fluid Extraction