Abstract
During the electrolysis of water, especially on lead dioxide anodes, a considerable amount of ozone is evolved. It has been proposed by several authors, that a significant contribution to the oxygen atoms of molecular oxygen and ozone originates from the anions of the electrolyte. We have used marked water containing 18O isotopic tracer for solvent, with some of the important oxo-acids and phosphate buffer as electrolytes. On both platinum and lead dioxide anodes we have shown that under the conditions of our experiments at relatively low current densities (200 mA cm 2) all oxygen atoms originate from water only. This applies too for simultaneous reactions as in the case of chlorate oxidation.
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