Extraction of tetravalent berkelium from nitric acid solutions with trioctylphosphine oxide

Journal Article · · Sov. Radiochem. (Engl. Transl.); (United States)

OSTI ID:6549198

Kosyakov, V N; Yakovlev, N G

The extraction of Bk(IV) and Ce(IV) from nitric acid solutions by solutions of trioctylphosphine oxide (TOPO) in decane in the range of HNO/sub 3/ concentrations from 2 to 14 moles/liter has been studied. The high efficiency and selectivity of TOPO as an extractant with respect to Bk(IV) has been shown. It has been found that, in the investigation range of HNO/sub 3/ concentrations, like other tetravalent cations, two TOPO molecules are involved in the composition of the extracted Bk(IV) complex. At the same time, with increase in the HNO/sub 3/ concentration, D/sub Bk(IV)/ rises somewhat, while D/sub Ce(IV)/, starting at 5 mole/liter HNO/sub 3/, diminishes sharply. This circumstance has made it possible to advance a hypothesis that there is a different mechanism for the extraction of these cations from concentrated HNO/sub 3/ solutions, and to effect a separation of Bk and Ce in the tetravalent states.

• OSTI ID: 6549198
• Journal Information: Sov. Radiochem. (Engl. Transl.); (United States), Journal Name: Sov. Radiochem. (Engl. Transl.); (United States) Vol. 25:2; ISSN SVRDA
• Country of Publication: United States
• Language: English

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400105* -- Separation Procedures
ACTINIDE COMPLEXES
ACTINIDES
ALKALI METAL COMPLEXES
ALKALI METALS
BERKELIUM
BERKELIUM COMPLEXES
CESIUM
CESIUM COMPLEXES
COMPLEXES
DISPERSIONS
DISTRIBUTION FUNCTIONS
ELEMENTS
EXTRACTION
FUNCTIONS
HYDROGEN COMPOUNDS
INORGANIC ACIDS
METALS
MIXTURES
NITRIC ACID
ORGANIC COMPOUNDS
ORGANIC PHOSPHORUS COMPOUNDS
QUANTITY RATIO
SEPARATION PROCESSES
SOLUTIONS
SOLVENT EXTRACTION
TOPO
TRANSPLUTONIUM ELEMENTS
TRANSURANIUM COMPLEXES
TRANSURANIUM ELEMENTS