Chemiluminescent flow sensor for H2O2 based on the decomposition of H2O2 catalyzed by cobalt(II)-ethanolamine complex immobilized on resin

The decomposition of H2O2 catalyzed by transition metal ion has been invest igated by chemiluminescence (CL). Using a heterogeneous catalyst, Co(II)-mo noethanolamine complex immobilized on Dowex-50W resin, the rapid decomposit ion of H2O2 was observed. A very weak CL appeared during the H2O2 solution mixed with the immobilized resin by batch method. When appropriate amount o f neutral luminol solution was added into the heterogeneous system, a brigh t CL emission was recorded. This heterogeneous CL system was developed as a H2O2 flow sensor. Detection limit of H2O2 using Dowex 50W-X4-Co-monoethano lamine as catalyst is 1 x 10(-7) M (S/N = 3). The flow sensor is of long li fetime, highly selective and very stable in the neutral solution. The appli cation of the proposed method to determine H2O2 in rainwater samples withou t any special pre-treatment gives out a satisfactory result. (C) 2001 Elsev ier Science B.V. All rights reserved.