Yields and reactions of hydrogen ions on radiolysis of water and aqueous solutions

Yields of hydrogen ions have been measured by pulse radiolysis with optical registration of short-lived species and by use of chromate ions and pH indicators as scavengers of H3O+. It was found that G(H3O+) for the bulk of the solution (after the completion of reactions in spurs) is approximately 3 to 3.3 ions/100ev. Some reactions of H3O+ ions were also studied by the pulse radiolysis method. The rate constants of their reactions with pH indicators, bromophenol blue, phenol red and bromothymol blue, were determined. They are 1.6 x1010, 7.2 x 1010 and 8.8 x 1010 dm3 mol-1 s-1 respectively. The earlier conclusion that free hydrogen ions take no part in the formation of Cl2- during pulse radiolysis of neutral aqueous solution of alkaline metal chlorides was confirmed on the basis of results of the investigation of the influence of Cr042- additions and temperature on G(Cl2-). (author)