Abstract
The polarographic behaviour of hydrogen peroxide has been studied at the dropping and jet electrodes. For both electrodes, the half-wave potential, E12, is constant for pH values <11·5. Beyond this value E12 becomes more and more negative as pH increases.The jet electrode gives a single wave, even in strongly alkaline solution, and id is proportional to hydrogen peroxide concentration over the whole range of pH.The dropping electrode gives two waves at pH ⩾ 13·4. In this pH region the height of the second wave is proportional to [H2O2] whereas that of the first is not. With varied dropping rate, the height of the first wave remains constant but that of the second varies more sharply than what would correspond to a diffusion-controlled process. Thus the relation between the height of the two waves depends on the dropping rate.It is proposed as a working hypothesis that the first wave is due to the adsorption of one of the products that appear during the overall reduction process of the hydrogen peroxide.
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