亜炭中の微量のゲルマニウムの定量について

概要

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Analysis of a minute amount of germanium in lignite and coal has been carried out by the following method with good result. Pulverized sample of lignite and coal is heated on a sand bath with 10 cc sulfuric acid and 2-3 cc nitric acid until it gives off a small amount of white fume, at this time, nitric acid is added dropwise and this process is repeated until a light yellow clear solution with a white residue is obtained. The residue is filtered off, ashed with the filter paper, the ash is decomposed with hydrogen fluoride and sulfuric acid, the solution and the filtrate from the preceeding operation are combined, made acid with HCl and distilled. The distillate is used for quantitative determination by coloration with phenylfluorone. Accurate determinations of germanium in a few samples of lignite, a coal and those with addition of up to 100γ of germanium were made by this method and necessary procedures of this method were described.
社団法人日本分析化学会の論文