水酸化ニッケル共沈分離　　フレーム原子吸光法による高純度アルミニウム中の微量不純物の定量

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タイトル別名
  • Determination of trace impurities in high-purity aluminum by flame atomic absorption spectrometry after coprecipitation with nickel hydroxide
  • スイサンカ ニッケル キョウチン ブンリ フレーム ゲンシ キュウコウホウ ニ

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説明

Some trace elements (Fe, Cu, Zn, Mg, Mn, and Cr) in high-purity aluminum (99.99 %) were determined by flame atomic absorption spectrometry. To avoid the interference of aluminum, the separation of the elements from aluminum was investigated by the coprecipitation method with nickel hydroxide. Nickel ion was not only excellent as the coprecipitation agent, but effective to enhance the decomposition of high-purity aluminum. The following procedure is recommended: Heat and decompose 1.00 g of aluminum together with 20 ml of 6 M hydrochloric acid and 2 ml of nickel chloride solution (Ni : 2 mg/ml). Add 3 ml of 7 M nitric acid, heat to oxidize reduced nickel and impurities and evaporate to a syrup. Dissolve the salts with water and dilute to 100 ml. Add 5 M sodium hydroxide solution (32 ml) while stirring magnetically until aluminum hydroxide is redissolved. Separate the precipitate of nickel hydroxide by filteration and dissolve it with dilute hydrochloric acid. Transfer the solution into a 25-ml volumetric flask. Add 1 ml of strontium chloride solution (Sr : 50 mg/ml) for suppression of interferences and dilute to the mark with water. Run a blank by using definite amounts of the reagents. Determine the analyte elements in the sample and blank solutions by atomic absorption spectrometry. The coefficients of variation for the elements in about (150) ppm are all below 10%. This method is very simple, rapid, and highly sensitive, and suitable for the determination of the elements in the (1100) ppm range in aluminum.

収録刊行物

  • 分析化学

    分析化学 31 (3), 130-134, 1982

    公益社団法人 日本分析化学会

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