Extraction of selected transplutonium(III) and lanthanide(III) ions by dihexyl-N,N-diethylcarbamoylmethylphosphonate from aqueous nitrate media

Journal Article · Fri May 01 04:00:00 EDT 1981 · Sep. Sci. Technol.; (United States)

DOI:https://doi.org/10.1080/01496398108068530· OSTI ID:6177838

Horwitz, E P; Muscatello, A C; Kalina, D G; Kaplan, L

The extraction behavior of selected transplutonium(III) and lanthanide(III) ions from nitrate solution was studied using relatively pure dihexyl-N,N-diethylcarbamoylmethylphosphonate (DHDECMP). The data obtained for Am(III) and Eu(III) using DHDECMP were compared with analogous measurements obtained with dibutyl butylphosphonate (DB(BP)) and in certain cases with dihexyl-N,N-diethylcarbamoylethylphosphonate (DHDECEP). It was found that both the nitrate and extractant concentration dependencies were third power. The K/sub d/'s for Am(III) and for Eu(III) measured from low acid LiNO/sub 3/ solutions were similar for DHDECMP, DHDECEP, and DB(BP), thus giving no evidence for any significant chelation effect for DHDECMP. Significant differences among DHDECMP, DHDECEP, and DB(BP) are found for the extraction of Am(III) and Eu(III) from 1 to 5 M HNO/sub 3/. These differences are explained by the ability of DHDECMP (and to a lesser extent, DHDECEP) to buffer itself against HNO/sub 3/ by protonation of the amide group. The K/sub d/'s for Am(III) through Fm(III) and for La(III) through Lu(III) measured from LiNO/sub 3/ and HNO/sub 3/ using DHDECMP show a definite tetrad effect when plotted as a function of Z. The K/sub d/'s for the lanthanides generally decrease with Z whereas the K/sub d/'s for the transplutonium elements change very little with Z.

• Research Organization: Argonne National Lab., IL
• OSTI ID: 6177838
• 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

Related Subjects

37 INORGANIC, ORGANIC, PHYSICAL, AND ANALYTICAL CHEMISTRY
400105* -- Separation Procedures
ACTINIDES
ALKALI METAL COMPOUNDS
AMERICIUM
AQUEOUS SOLUTIONS
BERKELIUM
BUFFERS
CALIFORNIUM
CERIUM
COMPARATIVE EVALUATIONS
CURIUM
DATA
DHDECMP
DISPERSIONS
DISTRIBUTION FUNCTIONS
DYSPROSIUM
EINSTEINIUM
ELEMENTS
ERBIUM
ESTERS
EUROPIUM
EXPERIMENTAL DATA
EXTRACTION
FERMIUM
FUNCTIONS
GADOLINIUM
HOLMIUM
HYDROGEN COMPOUNDS
INFORMATION
INORGANIC ACIDS
LANTHANUM
LITHIUM COMPOUNDS
LITHIUM NITRATES
LUTETIUM
METALS
MIXTURES
NEODYMIUM
NITRATES
NITRIC ACID
NITROGEN COMPOUNDS
NUMERICAL DATA
ORGANIC COMPOUNDS
ORGANIC PHOSPHORUS COMPOUNDS
OXYGEN COMPOUNDS
PHOSPHONIC ACID ESTERS
PRASEODYMIUM
PROMETHIUM
RARE EARTHS
SAMARIUM
SEPARATION PROCESSES
SOLUTIONS
SOLVENT EXTRACTION
SOLVENT PROPERTIES
TERBIUM
THULIUM
TRANSITION ELEMENTS
TRANSPLUTONIUM ELEMENTS
TRANSURANIUM ELEMENTS
YTTERBIUM
YTTRIUM