Abstract
Summary In connection with studies on mechanisms of reaction of oxidizing agents at the electrode surface, the reduction of periodate at a platinum electrode with periodical renewal of diffusion layer has been studied. The process is represented by two irreversible consecutive steps IO 4 − + 2 e − + 2 H + → IO 3 − + H 2 O ( i ) IO 3 − + 6 e − + 6 H + → I − + 3 H 2 O ( ii ) which have been separately investigated. The mechanism of reaction (i) involves two paths in which H 4 IO 6 − and H 3 IO 6 2− are simultaneously reduced through one-electron potential-determining steps. Reaction (ii) is also interpreted on the basis of two parallel paths of order 1 and 0 respectively in hydrogen ion. The number of electrons involved in the slow steps of iodate reduction is uncertain.
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