Collect. Czech. Chem. Commun. 1997, 62, 620-625

Polyfunctional Derivatives of Imidodiphosphoric Acid as Extractants

Oldřich Navrátila, Petr Sládeka, Alena Tokárováa, Eckhard Herrmannb and Moein Nouamanc

a Military Academy, 682 03 Vyškov, Czech Republic
b Hochschule für Technik und Wirtschaft, 01069 Dresden, Germany
c Tishreen University, Lattakia, Syria


The distribution of calcium, strontium, barium and scandium between aqueous and organic phases was studied using 0.1 M HNO3 or 0.01 to 0.1 M HCl as the aqueous phase and solutions of selected derivatives of organophosphoric reagents containing the conventional =P(O)NHP(O)= bifunctional group or the analogous trifunctional or tetrafunctional group in various organic solvents as the organic phase. The effect of substitution of one ester group by an OH or NH2 group was examined. While for the alkaline earth metals the distribution ratio increases if the bifunctional group is replaced by a higher-functional group, the reverse is true for scandium. The extraction efficiency is improved by the presence of OH or NH2 substituent groups. The composition of the extracted species was inferred by logarithmic analysis and the corresponding extraction constants were calculated.

Keywords: Calcium; Strontium; Barium; Scandium; Solvent extraction; Polyfunctional analogs of imidodiphosphoric acid.