Electroreduction of Hypochlorite after Anodic Polarization on Pt Electrode

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  • KODERA Fumihiro
    Environmental Science Research Niigata, Advanced Ttechnology Center
  • UMEDA Minoru
    Department of Chemistry, Faculty of Engineering, Nagaoka University of Technology
  • YAMADA Akifumi
    Department of Chemistry, Faculty of Engineering, Nagaoka University of Technology

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Other Title
  • 白金電極上でのアノード分極後に観測される次亜塩素酸塩の還元反応
  • ハッキン デンキョク ジョウ デ ノ アノード ブンキョク ゴ ニ カンソク サレル ジアエンソサンエン ノ カンゲン ハンノウ

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Abstract

We developed a new analysis method of hypochlorite using a reduction wave observed at about 600 mV vs. Ag/AgCl, after the potential sweep direction was switched from anodic to cathodic. The measurement was performed using mirror-polished pure platinum as a working disk electrode. For the reduction wave observed at a switching potential of 1200 mV vs. Ag/AgCl, the cathodic peak current and the concentration showed a good linear relationship at a concentration range of 0.2∼6.0 mg dm−3. The relative standard deviation (n = 3) of the reduction wave gave a good result of RSD<0.02. This electrode reaction was investigated by varing the pH value, the switching potential, and the sweep rate. As a result, it is considered that the cathodic current can be attributed to the reduction of HClO, which is formed by shifting the pH to the acidic direction based on water electrolysis during anodic polarization.<br>

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 54 (10), 997-1002, 2005

    The Japan Society for Analytical Chemistry

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