Summary
A detection scheme based upon peroxyoxalate chemiluminescence, which utilizes two post-column pumps and two stages of depressurization is investigated. The chemiluminescent detection limit for perylene is 23 times lower than determined by fluorescence, and is in the attomole range. This detection technique is investigated for packed column supercritical fluid chromatography (SFC). Due to the interface design used and the chemical band narrowing effects of chemiluminescence, an apparent increase in efficiency is observed. The interface design affords a wide range of pressures to be used for a separation. During pressure programming the column effluent changes flow rate. Because of a back-pressure regulator, the reaction and detection take place at nearly constant pressure. Therefore pressure gradient work is possible without concern for post-column reagent solubility (which is a concern for high-performance liquid chromatography). The effects of the expanded CO2 from the SFC on the chemiluminescence signal and background are studied. The post-column detection is optimized for pH, photomultiplier voltage, concentrations and flow rates of the peroxide and oxalate ester.
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Sandmann, B.W., Grayeski, M.L. Peroxyoxalate chemiluminescence detection with packed column supercritical fluid chromatography. Chromatographia 38, 163–167 (1994). https://doi.org/10.1007/BF02290330
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DOI: https://doi.org/10.1007/BF02290330