Microdeterminations of Arsenic and Antimony in Metallic Germanium and Germanium Dioxide

概要

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The method for the determination of minute amounts of impurities in high-purity germanium was studied and a simple method for the determination of arsenic and antimony was successfully completed, by using only a small amount of sample. For the determination of arsenic, germanium was removed as germanium tetrachloride by distillation, or by dissolving the sample and, omitting the distillation and the isolation processes, reducing quinquevalent arsenic to trivalent arsenic and extracting with carbon tetrachloride after the addition of sodium diethyldithiocarbamate, arsenic was determined as molybdenum blue. Antimony was determined after removing germanium tetrachloride by distillation or separating antimony by coprecipitation with manganese dioxide, determined by the methyl violet method, a sensitive method of determination was developed by the present study. In this way, the determination of up to 0.1 p.p.m. of arsenic and 0.01 p.p.m. of antimony in metallic germanium was possible.