種々のポリアミノポリカルボン酸とスカンジウム（ＩＩＩ）との錯形成反応とその錯形成平衡を用いるスカンジウムの等速電気泳動分離

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書誌事項

タイトル別名
  • Complex formation of scandium(III) with polyaminopolycarboxylic acids and isotachophoretic separation of scandium using complexation equilibria.
  • シュジュ ノ ポリアミノ ポリカルボンサン ト スカンジウム 3 ト ノ サク

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抄録

The complex formation of tetraethylenepentamineheptaacetic acid (TPHA or H7L) or triethylenetetraminehexaacetic acid (TTHA or H6L) or diethylenetriaminepentaacetic acid (DTPA or H5L) with scandium(III) ion was investigated, and the stability constants were determined by potentiometric measurements. In aqueous 0.1M KNO3 solution, four mononuclear TPHA complex species ScH3L-, ScH2L2-, ScHL3- and ScL4- were formed. The binuclear TPHA complexes, Sc2L and Sc2HL, were also formed. The existence of two hydroxo TTHA complexes were indicated by titration data. The order of stability constants of mononuclear complex (log KML) was as follows: Sc(III)-DTPA (20.99)>Sc(III)-TTHA (19.12)>Sc(III)-TPHA (19.04). The lower stability constants of TPHA and TTHA complexes compared to DTPA was thought to be due to the higher number of donor groups in the TPHA and TTHA molecule which were not bound to scandium. It was found that the stability constant of monoprotonated mononuclear TPHA complex is greater than those of DTPA and TTHA. The tendency to form protonated complexes increased as expected with increasing number of carboxylic groups in the molecule. The separation of scandium(III)- and lanthanum(III)-TPHA complex by isotachophoresis is also described in detail. The satisfactory separation of scandium in acetone-water medium (50%v/v) was accomplished by using citric acid as the terminating electrolyte with the leading solution containing 5mM hydrochloric acid, buffered at pH 2.4 with 1mM β-alanine.

収録刊行物

  • 分析化学

    分析化学 40 (5), 215-220, 1991

    公益社団法人 日本分析化学会

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