Rate constants of some reactions of H atoms in aqueous solution

Using a variety of scavengers, the rate constants of the reactions of these with atomic hydrogen in aqueous solution are compared when H atoms are produced (a) in the gas phase by a high-frequency electrodeless discharge and introduced into the aqueous solution and (b) by irradiation of the aqueous solution with ionizing radiations. With the help of this comparison it is shown that the diffusion model proposed previously may be used for the calculation of the rate constants from experiments using the first method. The reaction of atomic hydrogen with nitrate and nitrite ions was investigated under various conditions and rate constants determined. Phosphate ions inhibit these reactions, probably through complex formation with atomic hydrogen. Hydroxyl ions catalyze them, probably through the formation of hydrated electrons.