The reactivity of the electron formed in the radiolysis of aerated alkaline aqueous solutions containing tetracycline hydrochloride,at 77 K

The present study deals with the radiolysis of tetracycline hydrochloride dissolved in aerated alkaline aqueous solutions containing 0.1, 0.5 and 1M NaOH, at 77 K, as followed by ESR. The rate constants for the reactions between the electron and physical and chemical traps which are present in these solutions are calculated. These values are k_ph= =9.6·10¹⁵ l·mol^–1·s^–1 and k_ch=1.3·10¹⁰ l·mol^–1·s^–1. The reactivity of electrons that are formed in the radiolysis of water decreases in the following proportions: physical traps: chemical traps: molecules of water: 4.8·10¹⁴: 6.5·10⁸: 1.0. The electrons react preferentially with the solute instead of the solvent.From a thesis submitted by S.M.L.Guedes to the University of São Paulo in partial fulfillment of the requirements for a Doctor of Science Degree in Nuclear Technology.