EXTRACTION OF TETRAVALENT CERIUM WITH ORGANIC SOLVENTS (in Russian)
The currently used methods for separating Ce from the trivalent rare earth elements are based on its oxidation to the tetravalent state, followed by a second separation step. In view of the effectiveness of the extraction by organic solvents, the problems involved in the extraction of microamounts of radioactive Ce were studied, using Ce/sup 144/ as tracer and NaBrO/sub 3/, KBrO/ sub 3/, KClO/sub 3/, ozone, HNO/sub 3/, and anodic oxidation as oxidizing agents. Ozone was found to be most reliable because it is not affected by the contamination of the solution with extraneous ions. As extracting agents, diethyl ether, nitromethane, and tributyl phosphate were investigated. The first solvent was found to extract the Ce as the saturated ceric acid H/sub 2/STACe(NO/ sub 3/)B!. The other two agents extract the Ce as the nitrate Ce(NO/sub 3/)/sub 4/ when the HNO/sub 3/ concentration is kept low; at high nitric acid concentrations the Ce is again extracted as ceric acid. If the nitric acid concentration in the aqueous phase exceeds the value of 2N, the molar ratio of Ce(NO/sub 3/)/sub 4/ and HNO/sub 3/ in the organic phase will approach 1: 2, corresponding to H/sub 2/(Ce(NO/sub 3/)/sub 6/!. The constant of complex formation of the reaction of Ce(IV) with the nitrate ion was also calculated. (TTT)
- Research Organization:
- Originating Research Org. not identified
- NSA Number:
- NSA-17-040934
- OSTI ID:
- 4693347
- Journal Information:
- At. Energ. (USSR), Vol. Vol: 15; Other Information: Orig. Receipt Date: 31-DEC-63
- Country of Publication:
- Country unknown/Code not available
- Language:
- Russian
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