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