Abstract
pH-Potentiometric method in combination with mathematical modeling was used to study the system manganese(ii)—gadolinium(iii)—1-hydroxyethylidenediphosphonic acid (HEDP, H4L). When both cations simultaneously are present in the solution, the accumulation of heteronuclear forms with the ratio of Gd: Mn: HEDP equal to 1: 1: 1, 1: 1: 2, and 1: 1: 3 was observed already in the strongly acidic pH region, while from homonuclear forms only five complexes were detected in the solution, namely, MnL26–, GdH4L2–, GdH2L+, KGd2HL2↓, and K3Gd2L2(OH)↓. It was concluded that heteronuclear complexes are much stronger and replace homonuclear forms in solution.
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