Abstract
The uncompensated cell resistance of six carbon paste compositions used in carbon paste electrodes was measured before and after treatment with a 0.10% (w/v) aqueous surfactant solution. The surfactant treatment considerably lowered the paste uncompensated resistance by removing (or decreasing) the oily, insulating layer produced during the process of smoothing the electrode surface. Electrochemical evaluation of the untreated and treated surfaces was accomplished, by cyclic voltametry, square wave voltametry, and chronocoulometry. The improved response (increase is current) is, with some species, partially due to adsorption, but a significant increase in current was observed with species exhibiting no adsorption behavior (e.g., the reduced form of nicotinamide adenine dinucleotide, NADH). The improved response greatly enhances sensitivity in continuous-flow detection and the partial adsorption is not detrimental to response and quantitation under flow conditions.
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