Novel solvent system for metal ion separation: Improved solvent extraction of strontium(II) and lead(II) as dicyclohexano-18-crown-6 complexes
- Brigham Young Univ., Provo, UT (United States). Dept. of Chemistry and Biochemistry
As a part of the study of hazardous metal ion separations, the extraction of Sr{sup 2+} and Pb{sup 2+} from solutions containing nitric acid and various nitrate salts has been investigated. High partition ratios (D{sub Sr} > 100-10) were observed using comparatively low (10--50mM) concentrations of dicyclohexano-18-crown-6 in a group of nitrile solvents with relatively high dielectric constants (adiponitrile, glutaronitrile, succinonitrile, malononitrile; {var_epsilon} = 30--60) which are able to participate in coalescence extraction. Equilibria in the solvent extraction system were characterized, with Sr(II) and Pb(II) occurring in the organic phase primarily as partially dissociated ion pairs. A dramatic increase of extraction efficiency over traditional systems is achieved because of the formation of solvated cationic complexes in the organic phase.
- Sponsoring Organization:
- USDOE, Washington, DC (United States)
- DOE Contract Number:
- FG02-86ER13463
- OSTI ID:
- 691496
- Journal Information:
- Separation Science and Technology, Journal Name: Separation Science and Technology Journal Issue: 13 Vol. 34; ISSN 0149-6395; ISSN SSTEDS
- Country of Publication:
- United States
- Language:
- English
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