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Improved Chromatographic Resolution for Gas Chromatography/Matrix Isolation Infrared Spectroscopy

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When gas chromatography/matrix isolation infrared spectroscopy (GC/MI-IR) is carried out with a fixed cryodisk rotation speed, chromatographic resolution may be substantially degraded. In this research, an approach allowing dynamic programming of disk rotation speed is shown to result in much improved resolution in reconstructed chromatograms. Use of up to 254 different speeds during a single chromatographic run is possible. Thus, the analyst can match the requirements of any specific separation problem with an appropriate set of cryocollector movement speeds. As a consequence, much improved analytical performance without loss of sensitivity is possible for mixture analysis by GC/MI-IR, as is up to 30% higher apparent chromatographic resolution than is observed with a flame ionization detector. In addition, careful matching of sample spot size and detector area with the appropriate cryodisk speed leads to the detection of as little as 40 picograms of hexachlorobenzene.

Keywords: Chromatographic resolution improvement; Detection limits; GC/MI-IR; Gas chromatography/matrix isolation infrared spectroscopy; Hyphenated techniques

Document Type: Research Article


Affiliations: 1: Department of Chemistry, University of California-Riverside, Riverside, California 92521-0403 2: ICI Specialties, P.O. Box 42, Hexagon House, Blackley, Manchester M9 3DA, United Kingdom 3: ICI Wilton Research Centre, P.O. Box 90, Wilton Middlesbrough, Cleveland TS6 8JE, United Kingdom

Publication date: July 1, 1993

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