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Unified open tubular column chromatography: Sequential gas chromatography, at normal pressures, and supercritical fluid chromatography on the same column

✍ Scribed by Robert E. Robinson; Daixin Tong; Robert Moulder; Keith D. Bartle; Anthony A. Clifford

Publisher
John Wiley and Sons
Year
1991
Tongue
English
Weight
545 KB
Volume
3
Category
Article
ISSN
1040-7685

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✦ Synopsis

Abstract

A unified chromatograph was constructed in which open tubular column gas chromatography, at normal helium carrier gas pressures, followed by supercritical fluid chromatography with carbon dioxide mobile phase was carried out in a single run using a 100‐μm i. d. column. Sample introduction was accomplished by means of a pneumatically‐actuated rotary injection valve. A second rotary valve was used post‐column to direct the flow of column effluent to the flame ionization detector through an uncoated fused silica restrictor during the GC separation mode or to the FID through a frit restrictor during the SFC separation mode. This novel valve switching arrangement allowed system operating parameters of temperature and pressure programs and linear velocities to be optimized independently of each separation mode. The unified GC/SFC system was demonstrated for practical applications in various fields of process and product quality control.

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