Spectrophotometric Quantification of Peroxone

Abstract

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 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 10 µM for the analysis of a real peroxone sample prepared by electrolysis of water.

Keywords:

• Electrogeneration
• hydrogen peroxide
• molybdate catalyst
• ozone
• peroxone

Acknowledgments

The present work was supported financially by Grant-in-Aid for Scientific Research (A) (No. 10305064) to T. Ohsaka, from the Ministry of Education, Culture, Sports, Science and Technology (MEXT), Japan.