The invention describes a method for electrochem. producing the peroxodisulfuric acid and peroxodisulfates by electrochem. oxidn. of sulfuric acid. The process was carried using on an anode which, preferably, was not completely prepolarized and which was coated by a doped diamond layer. The conditions of the process (c.d., electrode shape, current load) and electrode doping and electrode substrates are described. [on SciFinder (R)]