Do aqueous ternary complexes influence the TALSPEAK process?
Journal Article
·
· Solvent Extr. Ion Exch.
The aqueous speciation of trivalent lanthanide and actinide cations in solutions containing DTPA (diethylenetriamine-N,N,N',N',N'-pentaacetic acid) and lactic acid were studied under conditions representative of the TALSPEAK process. Spectrophotometric titrations, fluorescence spectroscopy, and thermometric titrations were used to search for indications of ternary metal-DTPA-lactate complexes. The addition of lactate anions to metal-DTPA complexes was undetectable by any of these techniques, even at free lactate concentrations of 0.75 M. Although lactic acid is necessary for the optimal performance of the TALSPEAK process, we find that the fractions of aqueous ternary Ln3+/An3+-DTPA-lactate complexes are far too low to account for the observed acid dependence of TALSPEAK metal extraction.
- Research Organization:
- Argonne National Laboratory (ANL)
- Sponsoring Organization:
- SC
- DOE Contract Number:
- AC02-06CH11357
- OSTI ID:
- 982675
- Report Number(s):
- ANL/CSE/JA-66212
- Journal Information:
- Solvent Extr. Ion Exch., Journal Name: Solvent Extr. Ion Exch. Journal Issue: 3 ; 2010 Vol. 28; ISSN 0736-6299
- Country of Publication:
- United States
- Language:
- ENGLISH
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