Division of ion-pair extraction constants into individual ions and solvents

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  • 個々のイオン及び溶媒へのイオン対抽出定数の分割　　フェロン‐陽イオン界面活性剤系
  • ココ ノ イオン オヨビ ヨウバイ エ ノ イオンツイ チュウシュツ テイスウ
  • 個々のイオン及び溶媒へのイオン対抽出定数の分割 : フェロン-陽イオン界面活性剤系
  • フェロン-陽イオン界面活性剤系

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Abstract

It is found that the extraction constant Kex for the ion-pair extraction systems is made up of three independent constants (individual extraction constants), Kc, Ka, and Ks in accordance with the equation:<BR>logKex=logKc+logKa+logKs……(1)<BR>where the subscripts c, a, and s denote cation, anion, and solvent, respectively. The anion, cations, and solvents studied were 7-iodo-8-quinolinol-5-sulfonic acid (ferron), eight cationic surfactants and 1, 2-dichloroethane, dichloromethane, and chloroform. Cationic surfactants used in this work are alkyltrimethylammonium salts with alkyl chain lengths from 10 to 18 methylene groups, and several quaternary ammonium salts. Logarithm K values for several cations, anion, and solvents were calculated from experimental values of log Kex by tentatively assigning the logK values 1.0 and 1.0 to ferron and chloroform, respectively, as reference value. It was also shown that the association constant, KA and the distribution constant, KD are made up of independent constants KA, c, KA, a, (individual association constants) and KD, c, KD, a, Ks (individual distribution constants), respectively, in accordance with the equations:<BR>logKA=logKA, c+logKA, a……(2)<BR>logKD=logKD, c+logKD, a+logKs……(3)<BR>where subscript c, a, and s have the same meaning as in equation (1). Experimental data, are presented to show the validity of the above three equations.

Journal

  • BUNSEKI KAGAKU

    BUNSEKI KAGAKU 32 (11), 678-682, 1983

    The Japan Society for Analytical Chemistry

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