Gamma radiolysis of Methyl Red solution and reaction induced by γ-irradiated NaCl in Methyl Red

Abstract

The γ-radiolysis of Methyl Red solution in HCl medium at pH=2 has been studied along with energy transfer reaction brought about byF and hole centers of γ-irradiated NaCl. The G-values for degradation of the azo dye indicator by radiolysis and γ-irradiated salt were determined as 9·10⁻¹ and ∼ 4.8·10⁻³, respectively. The kinetic rate constants (k) of degradation are evaluated as ∼ 2·10⁻⁵ rad⁻¹ in the case of direct radiolysis, while for the irradiated salt it is ∼ 2·10⁻⁷ rad⁻¹. The extent of degradation by direct γ-radiolysis is ∼ 100–200 times greater as compared to that by the γ-irradiated salt. The same mechanism is proposed for radiolysis as well as the reaction induced by γ-irradiated sodium chloride.