Pulse radiolysis of oxygen-containing solutions of ferrous perchlorate in perchloric acid (1 M) enables the formation and disappearanceof a ferrichydroperoxidecomplex, F e 3 + H 0 ~, to be observed. The rate constant for its formation by reaction of Hot radicals with free ferrous ions is 2.1 f0.4 x lo6 M-ls-l in the pH range 0-2.1. The complex disappears in a first-order reaction with a rate constant independent of pH in the range 0-2.1. It exhibits a broad absorption in the region 280-600nm, with &a30 nm = 280f30 M-l cm-l. In the absence of oxygen, a different absorbing species can be seen, attributed to a ferric hydride complex, Fe3+H-. This is formed by the reaction of hydrogen
UNSTABLE products formed by reactions of OH and phuric acid. Effects due to complexing by HO, radicals with ferrous ions have been studied by sulphate have now been eliminated by using ferrous Keenel using ferrous sulphate in aqueous sulperchlorate in perchloric acid.
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