Abstract
The radiolytic decolourization and peroxide formation have been studied in aqueous solutions of xylenol orange (XO) at different acidities. The G(-XO) increases from 0.78 at pH 11, to 3.70 at pH 3. The peroxide yield also increases from 1.19 at pH 11, to 3.34 in 0.025 mol dm -3 H 2SO 4. In alkaline solutions only the OH . decolourizes XO whereas in acidic solutions both the H and OH . decolourize XO though G(-XO) due to H-atoms is less. The ionization of the phenolic group in XO influences the e - aq reaction with it. In alkaline solution, the oxidized and reduced XO formed by OH . and e - aq reactions, respectively, react together regenerating original XO. Near 0.025 mol dm -3 H 2SO 4, there is an abstraction of H-atom from XO by HO 2 whereas at other acidities, H 2O 2 is formed by disproportionation of peroxides. Reaction schemes have been given to explain the various radiolytic yields.
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