Protonation constants of 1-hydroxyethylidene-1,1-diphosphonic acid, diethylenetriamino-N,N,N',N'',N''-penta-acetic trans-1,2-diaminocyclohexane-N,N,N',N'-tetra-acetic acid.
The stepwise stability constants for the protonation of hydroxyethylidenediphosphonic acid (HEDP), diethylenetriaminopenta-acetic acid (DTPA) and diaminocyclohexanetetra-acetic acid (DCTA) have been determined potentiometrically with a hydrogen electrode at an ionic strength of 1 (KCl) and at 10-35 degrees . The data were treated by a least-squares method for estimation of DeltaH and DeltaS values.
Mioduski
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Department of Analytical and Radiochemistry, University of Liége, Sart Tilman B-4000, Liége, Belgium.