CONSTANT POTENTIAL AMPEROMETRIC DETECTION AT A COPPER-BASED ELECTRODE - ELECTRODE FORMATION AND OPERATION

Copper-based chemically modified electrodes (CMEs) previously used for the amperometric detection of carbohydrate compounds can be prepared via several different chemical and electrochemical procedures Including exposure of glassy carbon to a CuCI2 solution galvanlcally with a Cu counter electrode and plating of metallic Cu by cathodic deposition. In the former case, the mechanism most likely involves the formation of a coating of slightly soluble CuCI by a spontaneous redox reaction between Cu2+ and Cu metal. All of the Cu CMEs exhibit similar cyclic voltammetric and constant potential amperometric response toward carbohydrates and offer detection limits at the plcomole level in chromatography applications. © 1990, American Chemical Society. All rights reserved.