MONITORING OF HIGH HYDROGEN-PEROXIDE CONCENTRATIONS BY VOLTAMMETRY

Different electrode systems have been investigated as possible voltamm etric sensors for in-line measurements and monitoring of high concentr ations of hydrogen peroxide (up to 30 g/l) as used in alkaline textile bleaching liquor. With most of the tested electrodes insurmountable o hmic potential losses are encountered, resulting in a saturation of th e sensor output current. Taking accuracy and stability with time into consideration promising results are obtained with a rotating glassy ca rbon electrode, an ultra-micro platinum electrode and stationary titan ium and zirconium electrodes, in decreasing order of preference when s electivity versus the many possible additives used in industry are not yet taken into account.