Abstract
Abstract Polarographic reductions of barium, strontium and calcium ions in hexamethylphosphoramide (HMPA) have been investigated in the supporting electrolytes of various perchlorates. The reduction of these alkaline earth metal ions are strongly influenced by the cation of the supporting electrolyte. When the size of the cation of the supporting electrolyte is small and easily adsorbed on the negatively charged electrode surface as in the cases of Me4N+ and Et4N+ ions, the reduction of the metal ions does not occur until that of the supporting electrolyte. The reduction becomes easier with the increase of cationic size. Thus, in Hex4NClO4 or LiClO4, these metal ions are reduced almost reversibly. These effects of the cation of the supporting electrolyte can be explained as electrode surface phenomena as in the reduction of alkali metal ions.
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