Polyfunctional Derivatives of Imidodiphosphoric Acid as Extractants

TLDR: In this paper, the distribution of calcium, strontium, barium and scandium between aqueous and organic phases was studied using 0.1 M HNO 3 or 0. 1 M HCl as the organic phase and solutions of selected derivatives of organophosphoric reagents.

Abstract: The distribution of calcium, strontium, barium and scandium between aqueous and organic phases was studied using 0.1 M HNO 3 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 NH 2 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 NH 2 substituent groups. The composition of the extracted species was inferred by logarithmic analysis and the corresponding extraction constants were calculated.