Radiation-induced oxidation of HSO3- in aqueous-solutionстатья
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Дата последнего поиска статьи во внешних источниках: 5 апреля 2017 г.
Аннотация:Kinetics of HSO3- oxidation under e-beam irradiation has been studied. The ranges of main parameters: initial bisulfite concentration-2 x 10(-4)-3 x 10(-2) M, pH almost-equal-to 2-4, dose rate-I = 10(-3) - 10 kGy s-1. The stoichiometry of HSO3- oxidation in deaerated and aerated solutions was established. In deaerated solution the competition of reactions of H atoms with HSO3- (k1) and SO2 (k2) was observed. The estimated rate constants: k1 of order 10(7) and k2 of order 5 x 10(7) M-1 s-1. It was found that only sulfate has been produced in SO3- radicals self-recombination. For aerated solution at 1 less-than-or-equal-to 10(-1) kGy s-1 HSO3- oxidation proceeds in degenerated chain regime with main termination reaction HO2 + SO5- and maximum chain length almost-equal-to 10. The influence of mass-transfer processes to the oxidation rate in thin water film in a contact with gas mixture air-SO2 has been also investigated.