弗化チタン水素酸-過酸化水素試薬を用いる分析-2-

概要

論文の詳細を見る
When a solution of silicic acid is reacted in about 1 N sulfuric acid medium with the hydrofluotitanic acid-hydrogen peroxide reagent (a mixed solution of sodium fluotitanate, sodium fluoride, and hydrogen peroxide), the yellow color of pertitanic acid, in an amount equivalent to that of silicic acid, is developed. This is due to the greater stability of hydrofluosilicate complex-ion as compared with that of hydrofluotitanate. Colorimetric determination of silicic acid by the use of this color reaction was carried out. By observing the absorption at a wave-length of 420 mμ, and at a concentration of the solution between 2 mg/20 cc and 14 mg/20 cc of SiO2, to which had been added 4 cc of the reagent of concentration 0.05 M with respect to titanium, a reproducible standard line was obtained. The apparatus used in handling the reagent and the reaction mixtures, as well as the absorption cells, were all made of synthetic resin.
社団法人日本分析化学会の論文