PRECISE COULOMETRIC COMPLEXOMETRIC TITRATION OF GALLIUM AND INDIUM

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 result...

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Published inBUNSEKI KAGAKU Vol. 33; no. 1; pp. E9 - E15
Main Authors TANAKA, Tatsuhiko, HASEGAWA, Hiromi, OISHI, Kazuyoshi, YOSHIMORI, Takayoshi
Format Journal Article
LanguageEnglish
Published Tokyo The Japan Society for Analytical Chemistry 01.01.1984
Nippon Bunseki Kagakkai
Japan Science and Technology Agency
Subjects
Analytical chemistry
Chemistry
coulometric complexometric back-titration with EDTA
Electrochemical methods
Exact sciences and technology
high-precision determinations of gallium and indium
precise coulometric titration
stoichiometry of III-V compound semiconductors
Assay
Gallium III Ions
Semiconductor materials
Indium III Ions
Back
Indium III Complexes
Gallium III Complexes
Electrochemical titration
Coulometry
High purity
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Summary: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.
ISSN:0525-1931
DOI:10.2116/bunsekikagaku.33.E9