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A method is described which allows the titrimetric determination of the pH of decomplexation and of the formation constant of chelating ion-exchangers, although the titration curve is not complete. Iterative linearization leads to the formation constants and allows the completion of the titration curves. The studied systems are of the type MeL and MeL 2 , where the metals Me are zinc, copper and manganese, and the ligand L is Eriochrome Black T. The method may also be used for the determination of the number of ligands in a complex of the type MeL n .

zeitschrift für naturforschung b

Titrimetrische Analyse von Ionenaustauschgleichgewichten bei Unvollständigkeit der Titrationskurven / Titrimetric Analysis of Ion-Exchange Equilibria in the Case of Incomplete Titration Curves