Novel chemiluminometric H2O2 sensors for the selective flow injection analysis

Hydrogen peroxide can be detected chemiluminometrically in the presence of luminol at cobalt and copper foils. The chemiluminescence signal can also be induced electrochemically. The linear determination ranges are 0.1-200 mu M on cobalt and 5-2000 mu M on copper under flow injection conditions. To improve the selectivity the chemiluminescence detector was combined with a thin layer gas dialysis cell. Hydrogen peroxide was detected in the range between 0.5 and 100 mM. The interference by a more than 100-fold excess of EDTA, alpha-ketocarboxylic acids and peroxodisulfate can be excluded. Peroxomonosulfate concentrations greater than a ten-fold excess of hydrogen peroxide cause a significant bias, which resulted from the hydrolysis of peroxomonosulfate. (C) 1998 Elsevier Science S.A. All rights reserved.