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Studies Relating to Cathodic Reduction of Hypochlorite in Neutral Chloride Solutions Used in Chlorate Processes

Author Affiliations

  • 1 CSIR - Central Electrochemical Research Institute, Karaikudi - 630 006, INDIA

Res.J.chem.sci., Volume 2, Issue (10), Pages 55-59, October,18 (2012)

Abstract

The inhibition effect of the chromium hydroxide film for the reduction of hypochlorite has so far been studied on gold, platinum and iron electrodes in sodium hydroxide and sodium chlorate solution. But there is no reports were available in the case of alkaline earth metal chlorates. In order to more clearly distinguish, the effects of the film, the addition of chromate and its effect on the cathodic reduction of hypochlorite in sodium and alkaline earth metal chlorates solutions, the studies were carried out in platinum electrode. It was found that the addition of chromate to the sodium chlorate solution suppresses the hypochlorite reduction by forming a thin layer of chromium hydroxide on the electrode surface. In the case of magnesium, strontium and barium chlorate solutions the hypochlorite reduction was suppressed even without the addition of chromate in the electrolyte due to the formation of corresponding metal hydroxides on the electrode surface.

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