モリンとの錯形成速度の差を用いるガリウム及びインジウムの定量におけるアルミニウムの共存許容量

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タイトル別名
  • Tolerance level for aluminium in the kinetic determination of gallium and indium based on the difference in their complexation rates with morin.
  • モリン ト ノ サク ケイセイ ソクド ノ サ オ モチイル ガリウム オヨビ

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抄録

The kinetics and thermodynamics of the complexation reactions of aluminium, gallium and indium with morin have been studied fluorometrically to find the tolerance level for aluminium in the kinetic determination of gallium and indium. Under the selected conditions in which the pH of the reaction solution and the concentration of morin are 2.3 and 1×10-4 M, respectively, the differences in formation rates and fluorescent intensities for the respective complexes allow kinetic separation of gallium and indium from aluminium. The more reactive gallium or indium was selectively determined by a linear extrapolation method in the presence of aluminium; gallium and indium could be determined up to 1×10 -5 M with a detection limit of 9×10 -9 M and up to 5×10 -6 M with a detection limit of 2×10-8 M, respectively. In the determination of 5×10 -7 M of gallium and indium, the presence of a 400- and 500-fold amount (by molarity) of aluminium could be tolerated, respectively.

収録刊行物

  • 分析化学

    分析化学 41 (6), 257-261, 1992

    公益社団法人 日本分析化学会

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