Kinetic and Activation Thermodynamic Studies on the Decay of Organic Peroxides in γ - irradiation of Threonine in Aqueous Solutions at Different pH's

Abstract

Abstract Rate constants and thermodynamic studies have been performed on the decay of threonine amino acid peroxides produced from γ- irradiation of aqueous oxygenated solutions at different pH's. The decay was found to follow first order kinetic. The rate of decomposition increases by increasing temperature and pH of irradiated solutions. The activation thermodynamic measurements illustrate that, the decay of threonine amino acid peroxides is not spontaneously, and thus, it can be concluded that, the temperature here has important effect on post irradiation in this system. Significant change in values of ∆H*, ∆G* and specially ∆S* were observed depending on pH of irradiated solutions. On the view of the obtained results, a proper mechanism for decomposition was suggested.

Keywords

• kinetic and activation thermodynamic
• decay of organic peroxides
• γ - irradiation