Boron-doped diamond electrodes and microelectrode-arrays for the measurement of sulfate and peroxodisulfate

Measurements of sulfate and peroxodisulfate concentrations with boron-doped diamond (BDD) electrodes and microelectrode array electrodes have been performed in various media. Diamond electrodes allow the measurement of sulfate on the anodic side of the electrochemical window through its oxidation into peroxodisulfate, and detection of peroxodisulfate on the cathodic side through the reverse reduction reaction. In all cases, current density was proportional to solution concentrations. The effect of the doping level (boron concentration) of the diamond films on these measurements was evaluated. Some industrial applications of this technology are foreseen. (C) 2004 Elsevier Ltd. All rights reserved.