Polarographic currents in potassium peroxydisulphate-alkali halide systems and the determination of peroxydisulphate ion.
Potassium peroxydisulphate-alkali halide systems have been studied by d.c. and a.c. (sine wave) polarography. When the mercury drop of the mercury electrode becomes covered by a film of adsorbed bromide or iodide ions, a peak due to peroxydisulphate ion is found in the a.c. polarogram at a potential more negative than that of the halide peak. This peak is probably due to a product of a chemical reaction between the peroxydisulphate ion and halide ion close to the surface of the DME. The determination of the peroxydisulphate ion by a.c. polarography is described.
Hakoila
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Department of Chemistry, University of Turku, Turku 2, Finland.