A Kinetic Study of the Isotopic Exchange of Indium between the Indium Ion and its <I>N</I>-2-Hydroxyethylethylenediamine-<I>N</I>,<I>N</I>′,<I>N</I>′-triacetate Complex in an Acid Solution

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概要

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• 1) The isotopic exchange of indium between the indium ion and its EDTA-OH complex was kinetically studied in an acid solution, indium-114 m being used as tracer.<BR>2) Separation of the indium ion from its EDTA-OH complex was satisfactorily carried out with 8-quinolinol (oxin) at a pH about 3, and no appreciable heterogeneous exchange was observed between the precipitate and the solute.<BR>3) The exchange constant <I>R</I> was proportional to the concentration of the complex, the hydrogen ion and the ions such as dihydrogen citrate, but was independent of the concentration of the indium ion. It was affected by the ionic strength to a less extent, and the Arrhenius activation energy was 11 kcal. per mole.<BR>4) A plausible reaction mechanism was postulated on the basis of the kinetic data. The dissociation of the protonated indium EDTA-OH complex appears to be the ratedetermining step.

• 公益社団法人 日本化学会の論文

著者

• Tsuchimoto (nee

  Institute for Nuclear Study The University of Tokyo

関連論文

• A Kinetic Study of the Isotopic Exchange of Indium between the Indium Ion and its N-2-Hydroxyethylethylenediamine-N,N′,N′-triacetate Complex in an Acid Solution

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