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Published:Journal of Chromatographic Science,
ISSN 0021-9665Volume
37, Number 6, June 1999, pp. 203-209
Modification of the Collection
Solvent to Enhance Liquid Trapping Efficiencies After Supercritical Fluid Extraction
Lori H. McDaniel and Larry T. Taylor
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.
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