Abstract
Extraction of radiostrontium from dilute nitric acid solutions was studied using two Sr2+ selective crown ethers, viz. dicyclohexano-18-crown-6 and 4,4′(5′)-di-tert-butyl-dicyclohexano-18-crown-6, in several room temperature ionic liquids, viz. 1-butyl-3-methyl-imidazolium hexafluorophosphate (C4mim+·), 1-hexyl-3-methyl-imidazolium hexafluorophosphate (C6mim+·) and 1-octyl-3-methyl-imidazolium hexafluoro phosphate (C8mim+·); 1-butyl-3-methyl-imidazolium bis[(trifluoromethyl)sulphonyl] imide (C4mim+·), 1-hexyl-3-methyl-imidazolium bis[(trifluoromethyl)sulphonyl] imide (C6mim+·) and 1-octyl-3-methyl-imidazolium bis[(trifluoromethyl)sulphonyl] imide (C8mim+·). The role of time of equilibration, feed acidity and extractant concentration was investigated. The extracted species were found to have the stoichiometry of 1:1 with the metal ion and the crown ethers. Extraction from simulated high-level waste as the feed indicated lowering in the D Sr values, suggesting extraction of other metal ions to a certain extent. The radiolytic stability of the solvent systems was also investigated and compared with those reported in the literature.
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