Abstract
Solvent extraction characteristics of Th, U, Np, Pu, Am and Cm ions of various oxidation states by ionizable crown ethers such as sym-dibenzo-16-crown-5-oxyacetic acid and sym-dibenzo-16-crown-oxyacetylhydroxamic acid were studied. From results of pH-dependence of the distribution ratio of metal ions the ionizable crown ethers are promising for the application in the separation and preconcentration of actinide elements. The extracted species of Th(IV), U(VI) and Am(III) were confirmed to be Th(OH)2L2 (L; crown ether), UO2(OH)L and Am(OH)L2, respectively.
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