Abstract
Peroxyoxalate chemiluminescence (PO-CL) is a commonly used chemiluminescent detection method for liquid chromatography. This paper concerns the electrogeneration of peroxyoxalate chemiluminescence (PO-ECL) as a means to eliminate post-column reagent addition which is required with conventional peroxyoxalate chemiluminescence detection in liquid chromatography. In acetonitrile, peroxyoxalate chemiluminescence can be electrogenerated at potentials between −1.5 and −1.9 V (versus Ag/AgCl). Imidazole, a catalyst for PO-CL, was found to interfere with the electrochemisltry of the model peroxyoxalate and thus the emission of light with PO-ECL. Conversely, PO-ECL is enhanced in the presence of hydrogen peroxide. This enhancement is time dependent. Direct comparison showed PO-ECL to be less sensitive than PO-CL.
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