Abstract
Gallium(III) and indium(III) were determined precisely by coulometric complexometric titration. The ions were allowed to react with an excess EDTA of known purity, and the excess part of the reagent was back-titrated with zinc ion generated electrolytically from an amalgamated zinc anode. The results of the purity measurements of commercial high-purity gallium and indium metals (both nominally 5-nine) were 99.997 and 99.997%, with standard deviations of 0.003 and 0.009%, respectively. The proposed methods may be applicable to the evaluation of stoichiometric composition of the compound semiconductors such as gallium arsenide, indium phosphide, etc.
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