The solubility of ozone and kinetics of its chemical reactions in aqueous solutions of sodium chloride

Abstract

The solubility of ozone and the kinetics of its decomposition and interaction with chloride ions in a 1 M aqueous solution of NaCl at 20°C and pH 8.4–10.8 were studied. The ratio between the concentration of O3 in solution and the gas phase was found to be 0.16 at pH 8.4–9.8. The concentration of dissolved ozone decreased sharply as pH increased to 10.8 because of a substantial increase in the rate of its decomposition. It was observed for the first time that the interaction of O3 with Cl− in alkaline media resulted in the formation of ClO 3 − chlorate ions. The dependence of the rate of formation of ClO 3 − on pH was determined; its maximum value was found to be 9.6 × 10−6 mol l−1 min−1 at pH 10.0 and the concentration of ozone at the entrance of the reactor 30.0 g/m3. A spectrophotometric method for the determination of chlorate ions (concentrations 1 × 10−5−3 × 10−4 M) in aqueous solutions was suggested.