Radiation-induced oxidation of hypophosphite by molecular oxygen

Kinetics of radiation-induced )irradiation with 60Co γ-quanta) oxidation of sodium hypophosphite (NaH2PO2xH2O) by molecular oxygen at pH 4.5 has been studied. It is shown that depending on the concentration of initial substances the reaction proceeds according to two different kinetic regularities, corresponding to two different parts of the curve, which reflects the dependence of radiation-chemical yield of oxygen consumption on hypophosphite concentration. At the first section G(-O2) is directly proportional to the concetration of hypophosphite and inversely proportional to irradiation dose rate to the degree 1/2. At the second section G(-O2) increases with an increase in oxygen concentration, it is inversely proportional to the dose rate in the first degree and decreses with an increase in hypophosphite concentration, i.e. self-deceleration takes place. Transition from one kinetic regularity to the other occurs very sharply, and transition concentration hypophosphite is the higher the higher is the concentration of oxygen