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Extraction of Th(IV) and U(VI) by dihexyl-N,N-diethylcarbamoylmethylphosphonate from aqueous nitrate media

Journal Article · · Sep. Sci. Technol.; (United States)
; ;
The extraction behavior of Th(IV) and U(VI) from nitrate media was studied using relatively pure dihexyl-N,N-diethylcarbamoylmethylphosphonate (DHDECMP). The data were compared with analogous measurements obtained with dibutyl butylphosphonate (DB(BP)). It was found that the extractant dependency is second power for U(VI) with both DHDECMP and DB(BP). However, the extractant dependency for Th(IV) is third power for DB(BP) but varied from 2.5 to 2.0 power for DHDECMP depending on the total nitrate concentration. The K/sub d/ data do not support the theory that DHDECMP is an effective chelating agent for actinide ions. Significant differences between DHDECMP and DB(BP) do appear in the extraction behavior of Th(IV) from 1 to 5 M HNO/sub 3/. These differences are explained by the ability of DHDECMP to buffer itself against the effects of HNO/sub 3/ by protonation of the amide group.
Research Organization:
Argonne National Lab., IL
OSTI ID:
6370558
Journal Information:
Sep. Sci. Technol.; (United States), Journal Name: Sep. Sci. Technol.; (United States) Vol. 16:4; ISSN SSTED
Country of Publication:
United States
Language:
English

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Related Subjects

050800 -- Nuclear Fuels-- Spent Fuels Reprocessing
11 NUCLEAR FUEL CYCLE AND FUEL MATERIALS
37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400105* -- Separation Procedures
ACTINIDES
AQUEOUS SOLUTIONS
BUFFERS
COMPARATIVE EVALUATIONS
DATA
DHDECMP
DISPERSIONS
ELEMENTS
ESTERS
EXPERIMENTAL DATA
EXTRACTION
HYDROGEN COMPOUNDS
INFORMATION
INORGANIC ACIDS
METALS
MIXTURES
NITRIC ACID
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC PHOSPHORUS COMPOUNDS
PHOSPHONIC ACID ESTERS
SEPARATION PROCESSES
SOLUTIONS
SOLVENT EXTRACTION
SOLVENT PROPERTIES
TEMPERATURE EFFECTS
THORIUM
URANIUM