ガラス中のホウ素のメチレンブルーテトラフルオロホウ酸錯塩による抽出吸光光度定量(ノート)

概要

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A rapid and simple spectrophotometric method for determining boron in glasses is devised. A 0.100 g sample is decomposed with acid mixture of H2SO4, HF and H2O2 in a teflon beaker by heating on a water bath for 20 min. The solution is diluted to 20 ml when the content of boron is expected to be less than 10-3%, and to 200 ml when the content is 10-210-3%. To 20 ml of the sample solution in a polyethylene separatory funnel, Methylene Blue solution and dichloroethane are added and the mixture is shaken. After washing the organic phase with silver sulfate solution, its absorbance is measured at 660 nm. When the content of boron is a few %, a 0.010 g sample is taken and decomposed. After diluting the solution suitably, H2SO4 and HF are added anew to 10 ml of the sample solution, and its solution is diluted to 20 ml with water. Then, the determination can be carried out in the same way. Various substances usually present in glasses do not interfere with the determination of boron. It was possible to determine 2 × 10-5a few % of boron in glasses.
社団法人日本分析化学会の論文