Speciation Studies of Europium (III) with (Poly)Phosphonate Ligands. The Case of Edtmp

Authors:
C. Mateescu, Diana Dogaru, Ecaterina Princz, A. Salifoglou

The complex formation equilibrium of ethylenediamine-tetramethylenephosphonic acid (EDTMP, H8L) with europium (III) has been studied potentiometrically at 25°C and ionic strength of 0.15 M (NaCl). To examine the experimental data, titration curves of ligand in presence of europium (III) were compared with the references curves obtained in its absence. The complex formation constants were determined with the PSEQUAD program. The speciation in the system Eu (III) – EDTMP was calculated and drawn with HySS computer program.