Unified Chromatography from the Mobile Phase Perspective

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Chapter 2
Unified Chromatography from the Mobile
Phase Perspective
T. L. Chester
The Procter and Gamble Company, Miami Valley Laboratories,
P.O. Box 538707, Cincinnati, OH 45253-8707
Liquid, Subcritical Fluid, Enhanced Fluidity, Supercritical Fluid,
Hyperbaric, Solvating Gas, and Gas Chromatographies are merged into
a continuous model with no behavior gaps and no discontinuities. The
distinctions between individually named techniques vanish in this
unified model. It is based on the general phase behavior of Type I
binary mixtures (in which the two components are miscible as liquids).
Conventional Gas Chromatography and Liquid Chromatography are
simply limiting cases of the unified model and exist when the columnoutlet
pressure is ambient. Seeking the optimal conditions within the
allowed parameter space leads to significant separation improvements.
A unified chromatograph, with only a few new capabilities not already
found on a conventional liquid chromatograph, already exists
commercially and can perform all of the named techniques except
conventional GC.

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