フレーム原子吸光法による白金触媒中の白金の定量

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書誌事項

タイトル別名
  • Determination of platinum in the platinum-catalyst by flame atomic absorption spectrometry.
  • フレーム ゲンシ キュウコウホウ ニ

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抄録

The interference effect of soluble alumina on the determination of Pt in the alumina supported Pt catalyst by FAAS was studied in details. Effect of alumina was severe and complicated. To suppress alumina effect, various possible releasing agents including La, Ba, Sr, Mg, Cd and Ca were examined. Among them, Ca agent was found to have the best performance for releasing Pt from alumina and the other carriers such as silica gel and molecular sieve. Using this agent, moreover, Pt could be determined by both the calibration curve and standard addition method. La agent showed relatively better performance, the most effective method was the utilization of standard addition. The other four elements were not suitable as the releasing agent. The optimal operating conditions were decided: decompose the catalyst sample containing not larger than 2.5 mg Pt with about 10 ml aqua regia through heating. After cooling, add 10 ml of 5% Ca (NO3)2-10% HNO3 solution, make it 25 ml with H2O and measure the atomic absorption signal by FAAS. The effect of 27 foreign ions on the determination of Pt using Ca releasing agent was investigated and no remarkable interference was found. The eleven catalysts containing Pt in the range from 0.07 to 15% and γ-alumina, silica gel and molecular sieve as carrier were analyzed with both the calibration method and standard addition method. The results obtained by these two methods were identical within experimental error. The overall R. S. D. was less than 3% and the recoveries in the procedure were 95105%.

収録刊行物

  • 分析化学

    分析化学 35 (5), 459-464, 1986

    公益社団法人 日本分析化学会

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