A PULSE-RADIOLYSIS STUDY OF THE REACTION OF OZONE WITH CL2-RADICAL-ANION IN AQUEOUS-SOLUTIONS

Yields of .OH radicals were determined, with the use of the Cl2-. radical, in perchloric acid solutions (1.0 mM to 1.0 M) saturated with oxygen, nitrous oxide or nitrous oxide and ozone. The Cl2-. radical, produced by pulse radiolysis in aqueous solutions containing variable amounts of NaCl and HClO4/HCl, reacts with added ozone at k(O3 + Cl2-.) = (9.0 +/- 0.3) x 10(7) dm3 mol-1 s-1. Its molar absorbance at its 340 nm peak is epsilon = (9580 +/- 100) dm3 mol-1 cm-1. G(Cl2-.) = (6.4 +/- 0.1) in N2O saturated 0.1 mol dm-3 HClO4 containing 0.01 mol dm-3 NaCl and 0.4-6.3 mmol dm-3 ozone. The conversion of the primary reducing radicals (e(aq)-, H) to .OH radicals by ozone, will facilitate studies of hypervalent oxidation states of metal ions in acid solutions where G(H) > G(.OH).