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

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Zhihua Zuo, Yosuke Katsumura, Kiyotaka Ueda and Kenkichi Ishigure


Abstract

Rate constants for the reactions of free radicals, including eaq-, OH, SO4-, NO3 and Cl2- (ClNsbd), 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 (>109 dm3 mol-1 s-1). ClO- has relatively higher reactivity than its acid form. eaq- reacts with oxychloride compounds to form their electron adducts which dissociate easily. Electron transfer reactions occur between OH, SO4-, NO3 and Cl2- (ClNsbd) 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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