Polarographic Behavior of Diethylenetriaminepentaacetic Acid at the Dropping Mercury Electrode

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Abstract
Anodic waves of DTPA at DME in the presence and in the absence of calcium(II) and magnesium(II) ions were studied systematically, and the stability constants of mercury(II)-DTPA chelates were determined. The electrode reaction for the anodic waves of DTPA proceeds reversibly in a polarographic sense. In the presence of magnesium(II) ions, however, DTPA gives an irreversible wave. This may be ascribed to the slow reaction of the magnesium(II)-DTPA chelate. The use of DTPA as a titrant in the amperometric titration of metal ions which do not yield a polarographic wave under the usual polarographic conditions was also discussed briefly.