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Proceedings Paper

A Diffuse Reflectance Interface for SFC/FT-IR
Author(s): Kenneth H. Shafer; Stephen L. Pentoney; Peter R. Griffiths
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Paper Abstract

Supercritical fluid chromatography (SFC) permits nonvolatile or thermally labile compounds to be separated at high resolution without necessarily using a mobile phase which is liquid at atmospheric pressure or room temperature. The most common mobile phase to date has been carbon dioxide, at a pressure above about 1000 p.s.i. and a temperature above 35°C. Both packed columns of the type used for high performance liquid chromatography (HPLC) and wall coated open tubular (WCOT) capillary columns of the type used for high resolution gas chromatography (GC) can be used. In this paper, we report the on-line measurement of infrared spectra of peaks eluting from SFC columns using two approaches: 1) By passing the effluent from the column directly through a flow cell; 2) By eliminating the mobile phase while depositing the solute on KC1 powder prior to measuring its diffuse reflectance (DR) spectrum.

Paper Details

Date Published: 20 December 1985
PDF: 2 pages
Proc. SPIE 0553, Fourier and Computerized Infrared Spectroscopy, (20 December 1985); doi: 10.1117/12.970769
Show Author Affiliations
Kenneth H. Shafer, University of California (United States)
Stephen L. Pentoney, University of California (United States)
Peter R. Griffiths, University of California (United States)

Published in SPIE Proceedings Vol. 0553:
Fourier and Computerized Infrared Spectroscopy
David G. Cameron; Jeannette G. Grasselli, Editor(s)

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