Reactions between some inorganic radicals and oxychlorides studied by pulse radiolysis and laser photolysis

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Abstract
Rate constants for the reactions of free radicals, including e aq - , OH, SO 4 - , NO 3 and Cl 2 - (Cl Nsbd ), with oxychloride compounds have been determined. The free radicals were generated by pulse radiolysis and laser photolysis. Most of the reactions have nearly diffusion-controlled rate constants (>10 9 dm3 mol -1 s -1 ). ClO - has relatively higher reactivity than its acid form. e aq - reacts with oxychloride compounds to form their electron adducts which dissociate easily. Electron transfer reactions occur between OH, SO 4 - , NO 3 and Cl 2 - (Cl Nsbd ) radicals and the oxychloride ions. The kinetics results obtained here can be used in simulation work to understand the radiation-induced reactions taking place in groundwater which are relevant to the geological aspects of radioactive waste storage and disposal.

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