Abstract
Abstract A polarographic determination of In(III) and Cd(II), the reduction potentials of which are very close to each other, was investigated by a pH adjustment of a potassium chloride medium. The reduction wave of In(III) decreased linearly with the pH. At pH 7.0, the reduction wave of In(III) completely disappeared, while that of Cd(II) remained unchanged. This fact enables us to determine In(III) and Cd (II) separately; In(III) can be determined from the merged-wave height of In(III) plus Cd(II) by subtracting that of Cd(II), which can be directly determined.
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