EXTRACTION OF FE(III) BY DIALKYL(DIARYL)-[DIETHYLCARBAMOYLMETHYL]PHOSPHINE OXIDES FROM HNO3 AND HCLO4 SOLUTIONS

The extraction of Fe (III) from HNO3 and HClO4 solutions by dibutyl- a nd diphenyl[diethylcarbamoylmethyl]phosphines was studied as a functio n of the concentration of the reagents and acids and the phase-contact time as part of an investigation of the extraction of transplutonium and accompanying elements from acidic solutions. ne extraction equilib rium is quickly established in HNO3 systems; slowly, in HClO4 systems. It was found that Fe(III) is much more effectively extracted by both reagents from HClO4 solutions than from HNO3 solutions. The anomalous aryl strengthening (AAS) effect [1] was not directly observed in these systems. Adding small quantities of HClO4 to HNO3 SolUtions of Fe(III ) significantly increases the effectiveness of the Fe(III) extraction. The results are compared with the extraction behavior of Am under ana logous conditions. The apparent solvate number during Fe(III) extracti on from HClO4 increases with time from 1 to the equilibrium value (up to 3).