亜鉛-アルカリ半溶融法によるケイ酸塩中のホウ素の分離定量

概要

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In order to determine the boron in silicates, a mixture of Na2CO3 and ZnO was used as a decomposing agent. When the samples were heated with this decomposing agent, the silica in the samples was almost perfectly converted to a compound which was insoluble in water, and so the silica was easily separated from the soluble matter. The method for the determination of the boron based on this decomposition was tested and the following results were obtained. (1) Using a 2: 1 mixture of Na2CO3 and ZnO as the decomposing agent, the samples were perfectly decomposed at a temperature of 900°C for 10 minutes. (2) The quantities of silica which dissolved out of the decomposition product with boron varied according to the boron content of the samples, the more boron, the less silica dissolved. (3) The precision of this method was about 1% average deviation. (4) The time required for the determination was less than 2 hours.
社団法人日本分析化学会の論文