Abstract
A simple spectrophotometric method is proposed for the simultaneous quantification of the ozone (O
3
) and hydrogen peroxide (H
2
O
2
) 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 O
3
and H
2
O
2
are largely different and pH-dependent and, moreover, the oxidation of I
-
by H
2
O
2
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.