Spectrophotometric quantification of peroxone

A simple spectrophotometric method is proposed for the simultaneous quantification of the ozone (O3) and hydrogen peroxide (H2O2) mixture, the so-called peroxone. This method is based on the measurements of the absorbance of the I3- produced by the oxidation of I- by peroxone. The oxidation rates of I- by O3 and H2O2 are largely different and pH-dependent and, moreover, the oxidation of I- by H2O2 can be accelerated by a molybdate catalyst. In addition, the present method was successfully applied at concentrations as low as 10μM for the analysis of a real peroxone sample prepared by electrolysis of water. © Taylor & Francis Group, LLC.