V. Hietapelto et al., COMPLEXATION THERMODYNAMICS OF LANTHANOID(III) WITH ETHYLENEDIAMINETETRAPROPIONIC ACID (EDTP), Journal of alloys and compounds, 225(1-2), 1995, pp. 312-315
The complex formation equilibria between ethylenediaminetetrapropionic
acid (EDTP) and lanthanoid(III) ions were studied by potentiometric t
itration over the pH range 2.5-7.0. The measurements were taken in 0.1
0 M NaClO4 at 25 degrees C. The data indicate the formation of the spe
cies [Ln(HL)], [Ln(H(2)L)](+) and [Ln(H(3)L)](2+). Enthalpy values wer
e obtained for the [Ln(HL)] complexes by calorimetric titration.