Collect. Czech. Chem. Commun. 1981, 46, 462-466

Effect of Caro's acid in electrolytic preparation of peroxodisulphates

Jan Balej

Institute of Inorganic Chemistry, Czechoslovak Academy of Sciences, 160 00 Prague 6


Measurements of the current yield of oxygen and of the anode potential during electrolytic preparation of peroxodisulphates in a continually operating flow-through model electrolyser both in the stationary state and after the beginning of anolyte feeding with an increased content of Caro's acid into the anode space proved that this acid is preferentially oxidised at the anode under evolution of oxygen, whereby the current yield of peroxo compounds is lowered. Owing to this reaction taking place preferentially on the anode, the anode potential is lowered at constant current density, which is denoted as depolarization effect of Caro's acid in persulphate electrolysis.