Abstract
A glow discharge passed from a metal anode to the surface of sulphuric acid solutions produces hydrogen peroxide and peroxymonosulphuric acid. The yield of each product has been examined as a function of sulphuric acid concentration. The peroxide yield shows a maximum, which is attributed to the scavenging by sulphuric acid of radicals which attack peroxide. The yields of the products have also been examined as a function of pressure and the form of the variations can be explained in terms of a simplified reaction scheme. On the basis of the proposed mechanism the concentration of radicals is of the order of 10−5 mol/dm3 in the primary reaction zone, which extends effectively to a depth of about 400 nm into the solution.
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