チタン合金中の白金の吸光光度定量法

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タイトル別名
  • Spectrophotometric Determination of Platinum in Titanium Alloys
  • チタン ゴウキン チュウ ノ ハッキン ノ キュウコウ コウド テイリョウホウ

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A spectrophotometric method for the determination of platinum in titanium alloys has been developed by the use of platinum-tin chloride system. The color reaction of platinum (IV) with tin (II) in hydrochloric acid is very selective but not simple. The character of absorption spectra of platinum-tin chloride complexes along with the color intensities showed markedly varying dependence upon the concentrations of hydrochloric acid, although the changes became essentially far less notable in 1 to 6.3 N hydrochloric acid solution. But it was found that the system can be successfully applied to the spectrophotometric determination of platinum in titanium alloys by closely controlling the concentrations of platinum (IV), tin (II) and hydrochloric acid. Procedure: Dissolve 0.25 g of sample in 28 mL of 6 N hydrochloric, 2.5 mL of 2 M citric and 1 mL of 23 N hydrofluoric acids. When the reaction subsides, add 1 mL of nitric acid and heat the solution gently until dissolution is complete. Add 0.5 g of boric acid and 2 g of urea, and dissolve completely. Cool the solution to 10°∼30°C and transfer to a 50 mL calibrated flask. Add 2.5 mL of 1 M stannous chloride solution in 6 N hydrochloric acid, dilute to the mark with water and mix well. Let stand 5 min and obtain the absorbance of the solution at 404 mμ within an hour. Under the conditions, the system obeyed at the concentrations of 1 to 25 ppm platinum the experimental equation: a=KEY+b where a is the absorbance, KE is the apparent extinction coefficient given by 0.0414, Y is the concentration of platinum in ppm and b is the empirical constant on absorbance given by 0.025, with very good reproducibility through the whole range. Palladium (II) and gold (III) give color, and molybdenum (VI) bleach the color of platinum complexes. But many other elements normally found in titanium alloys cause no interference. The relative error by the developed procedure was less than ±1.5 percent at 0.05∼5 percent platinum level. This method is also useful for the determination of platinum in zirconium-base alloys.

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