Extraction of Fe(III) by dialkyl(diaryl)-(diethylcarbamoylmethyl)phosphine oxides from HNO{sub 3} and HClO{sub 4} solutions
- and others
An important problem of modern radiochemistry is to remove transplutonium elements (TPEs) from high-level wastes generated by the reprocessing of spent nuclear fuel and to separate them from accompanying elements, including corrosion products of the equipment, for example, Fe. The extraction of Fe(III) from HNO{sub 3} and HClO{sub 4} solutions by dibutyl- and diphenyl(diethylcarbamoylmethyl)phosphines was studied as a function 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. The extraction equilibrium is quickly established in HNO{sub 3} systems; slowly, in HClO{sub 4} systems. It was found that Fe(III) is much more effectively extracted by both reagents from HClO{sub 4} solutions than from HNO{sub 3} solutions. The anomalous aryl strengthening (AAS) effect was not directly observed in these systems. Adding small quantities of HClO{sub 4} to HNO{sub 3} solutions of Fe(III) significantly increases the effectiveness of the Fe(III) extraction. The results are compared with the extraction behavior of Am under analogous conditions. The apparent solvate number during Fe(III) extraction from HClO{sub 4} increases with time from 1 to the equilibrium value (up to 3).
- OSTI ID:
- 133113
- Journal Information:
- Radiochemistry, Journal Name: Radiochemistry Journal Issue: 6 Vol. 35; ISSN RDIOEO; ISSN 1066-3622
- Country of Publication:
- United States
- Language:
- English
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