高純度ガリウム中の銅,鉄,亜鉛,アルミニウムの光度定量

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The spectrophotometric determination of trace impurities in high purity gallium was studied.<BR>Copper and iron are determined by direct extraction using respectively batho-cuproine and bato-phenanthroline. From a citric acid solution containing gallium, copper is determined by batho-cuproine amylalcohol extraction. After copper is removed by this extraction, iron is determined by batho-phenanthroline-amylalcohol extraction.<BR>Zinc is separated from the greater part of gallium by dithizone extraction form a citric acid solution of the sample, and stripped by dil. hydrochloric acid. Following this pre-treatment, zinc is determined by the dithizone method, in which other dithizone metals are masked.<BR>Aluminum is determined by the oxine method after removing gallium by isopropylether and DDTC-ethylacetate extractions. As gallium reacts with oxine in a way similar to aluminum, it is important to remove gallium completely before the oxine method is carried out.<BR>The sensitivities of these methods are 0.5 ppm copper, iron, and zinc, and 1 ppm aluminum per 2 g of sample taken.
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