Extraction of group 1-3 metals by F-substituted dithiophosphoric acids in the presence of crown ethers 18-crown-6 and 15-crown-5
The radioactive tracers {sup 241}Am, {sup 152,154}Eu, {sup 144}Ce({sup 144}Pr), {sup 137}Cs, and {sup 85}Sr are used to determine the distribution coefficients of Am(III), Eu(III), Ce(III), Cs, and Sr on extraction from nitrate and chloride solutions by mixtures of F-substituted analogs of dithiophosphoric acids (F-DTPA) of general formula (H(CF{sub 2}CF{sub 2}){sub n}CH{sub 2}O){sub 2}P(S)SH (n = 1, 2, 3) and crown ethers 15-crown-5 (15C5) and 18-crown-6 (18C6). Higher selectivity is found for F-DTPA in the presence of 18C6 for Ce(III), Eu(III), and Am(III) as compared with 15C5. The extraction properties of F-DTPA are largely analogous to those of the strong organic acid chlorinated cobalt dicarbollide. The separation factors of the Eu(III)-Am(III) pair on extraction by mixtures of F-DTPA with tributylphosphate (TBP) do not reach the values obtained in the literature for mixtures of TBP and dithiophosphoric acids.
- OSTI ID:
- 120986
- Journal Information:
- Radiochemistry, Journal Name: Radiochemistry Journal Issue: 2 Vol. 36; ISSN RDIOEO; ISSN 1066-3622
- Country of Publication:
- United States
- Language:
- English
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