Analytical Sciences
Online ISSN : 1348-2246
Print ISSN : 0910-6340
ISSN-L : 0910-6340
Determination of Formation Constants and Association and Dissociation Rate Constants of Complex Ions by Means of Ion-Transfer Voltammetry
Hajime KatanoKotaro TanakaMitsugi Senda
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1997 Volume 13 Issue Supplement Pages 299-300

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Abstract

Ion-transfer voltammetry of the facilitated transfer of Pb2+ ion by 1, 4, 7, 10, 13, 16-hexathiacyclooctadecane across the polarizable nitrobenzene/water interface has been applied to the study of complexes of Pb2+ ion with hydrophilic ligands, acetate-, tartarate2-, and citrate3- ions in aqueous media. The formal formation constants of 1:1, 1:2, and 1:3 Pb2+-acetate- complexes were determined to be 102.3M-1, 103.0M-2, and 104.0M-3. The dissociation and association rate constants were determined to be 2.1×103s-1and 2.2×107 M-1 s-1 for 1:1 Pb2+ -tartarate2- complex and 4.5×104s-1 and 8.O×1010M-1 s-1 for 1:1 Pb2+ -citrate3- complex, respectively.

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