AN AMPEROMETRIC DETECTOR WITH A TUBULAR ELECTRODE DEPOSITED ON THE CAPILLARY FOR CAPILLARY LIQUID-CHROMATOGRAPHY

A procedure is described for the preparation of a tubular electrode by chemical deposition of platinum at the end of a fused-silica capillar y. The properties of the electrode were tested under liquid chromatogr aphic conditions, demonstrating that both the static and the dynamic b ehaviour of the detection system satisfy the requirements of capillary chromatographic separations and compare well with a wall-jet amperome tric system and with UV photometric detection. The detection system de scribed is easy to prepare and does not require any time-consuming pos itioning of the electrode system as it is integrated into the separati on part of the apparatus. (C) 1998 Elsevier Science B.V.