STRATEGIES FOR THE DEVELOPMENT OF A VOLTAMMETRIC SENSOR FOR THE DETERMINATION OF HYDROGEN-PEROXIDE AT HIGH-CONCENTRATIONS

Different strategies are presented for the development of a voltammetr ic sensor for in-line measurement and monitoring of H2O2 in high conce ntrations (up to 30 g/l) as used in textile bleaching systems. When us ing macroelectrodes, signal saturation is observed even at medium conc entrations. Some improvement can be achieved by hydrodynamic electrode s like ring-disk electrodes. Satisfactory results up to the desired le vel in practical solutions (possessing only limited conductivity) are obtained with Pt-microelectrodes.