J. Phys. Chem. 1984,88, 4144-4147
4144
A Pulse Radiolytic Study of the Reactlon OH f O3 in Aqueous Medium K. Sehested,* J. Holcman, E. Bjergbakke, and Edwin J. H a d Accelerator Department, Rise, National Laboratory, DK 4000 Roskilde, Denmark (Received: April 4, 1984) In slightly alkaline solution the ozonide radical ion, 03-, forms as a product of the hydroxyl radical reaction with ozone. For each 03formed, two O3molecules are consumed. In acid solution the product of this reaction is the perhydroxyl radical, H02, formed from one O3 molecule. Our results are consistent with the gas-phase reaction where the products are HOZ and 0,. A rate constant of (1.1 f 0.2) X lo8 dm3 mol-' s-' is found for the reaction OH + O3 H 0 2 0,. This rate constant was obtained by three systems, by buildup of 03-in basic solutions, by competitionof the OH radical with the carbonate ion, and directly by O3consumption in acid solution. The rate constant for the reaction of HOz with O3 is very low,
