Abstract
The stoichiometry and stability constants for americium and europium complexes with phosphonoacetic acid (HO2CCH2PO3H2 − PAA) in dilute acid solutions (0.005 to 0.02 M) have been determined by distribution methods at 0.5 M ionic strength and 25.0°C. The identified Am and Eu complexes and log β mhl values are Am(H2L)2+ − 13.82(±0.04), Am(HL)+ − 11.62(±0.04), Am(H2L)2 + − 27.35(±0.01), Eu(HL)+ − 12.10(±0.05), Eu(H2L)2 + − 27.81 (±0.01), Eu(HL)2 − − 23.08(±0.05). The Eu complexes are stronger than Am complexes of comparable stoichiometry, in accord with the electrostatic nature of the metal-ligand interaction. PAA was tested as a potential agent of enhanced Am/Eu separation in solvent extraction systems by examining Am and Eu extraction using different extractants. For extraction into bis(2-ethylhexyl)phosphoric acid (HDEHP), PAA slightly reduces the Am/Eu separation factor. With dinonylnapthalenesulfonic acid (HDNNS), or octyl(phenyl)-N, N-diisobutyl-carbamoylmethylphosphine oxide (CMPO)-nitrate extraction systems, SEu Am is slightly enhanced by PAA.
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