硼酸の比色定量
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概要
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When boric acid is added to a mixture of hydrofluotitanic acid and hydrogen peroxide, titaniumion is liberated due to the formation of hydrofluoborate ion; and the color of pertitanic acid is developed by the action of hydrogen peroxide, the color intensity being proportional to the concentra tion of boric acid. A good, straight standard line was obtained at 420 mμ. The reagent used was a one normal sulfuric acid solution of mol-ratio Na<SUB>2</SUB>TiF<SUB>6</SUB>: NaF: H<SUB>2</SUB>O<SUB>2</SUB>=1: 4: 1 and of one tenth mc'al concentration with respect to titanium. The medium was one normal sulfuric acid solution, and the range of observation was between 2 mg/25 cc and 18 mg/25 cc of boric acid. To avoid the effect of the acidity of hydrofluoboric acid, which is a strong acid, the solution of the sample had to be that of sodium metaborate. Also, since the reagent is colored by the silicic acid of glass, reaction apparatuses, reagent vessels, and colorimetric cells all made of plastic were used.
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