弗化チタン水素酸-過酸化水素試薬を用いる分析-1-

概要

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It has been found that when a substance such as silicic acid which produces a more stable fluorocomplex than that of titanium, is added to a mixture of hydrofluotitanic acid and hydrogen peroxide, the mixture becomes yellowish-colored due to the formation of pertitanic acid, and it may therefore be used as a coloring reagent for such substances. Some pertitanic acid is formed merely by mixing hydrogen peroxide with sodium fluotitanate solution, so a solution of the mol-ratio, Na2TiF61 : NaF4 : H2O21, is suitable for using asa coloring reagent. The reaction of silicic acid with the reagent is best observed in 1 N or more strongly acidified solution. The confirmation limits in the presence of contrast solutions, were SiO2 1 mg/5 cc in weak HF-acidic solution, and SiO2 0.05 mg/0.6 cc and SiO2 0.5 mg/10 cc in about 1.2 NH2SO4-acidic solution. By the use of a photoelectric colorimeter, at a wave-length of 420 mμ, a layer of 1 cm, and an acidity of 1 N H2SO4, SiO2 0.1 mg/10 cc was detected. As the reagent reacts with glass, all of the test-tubes, burets, cells of the colorimeter, and other vessels used were made of synthetic resin.
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