Complexation of Am(III) by oxalate in NaClO{sub 4} media

Conference · Fri Sep 01 00:00:00 EDT 1995

OSTI ID:102412

Choppin, G R; Chen, J F ^[1]

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1. Florida State Univ., Tallahassee, FL (United States)

The complexation of Am(III) by oxalate has been investigated in solutions of NaClO{sub 4} up to 9.0 M ionic strength at 25{degrees}C. The dissociation constants of oxalic acid were determined by potentiometric titration, while the stability constants of the Am(III)-oxalate complexation were measured by the solvent extraction technique. A thermodynamic model was constructed to predict the apparent equilibrium constants at different ionic strengths by applying the Pitzer equation using parameters for the Na{sup +}-HOx{sup -}, Na{sup +}-Ox{sup -}, AmOx{sup +}-ClO{sub 4}{sup -}, and Na{sup +}-Am(Ox){sub 2}{sup -} interactions obtained by fitting the data.

• Research Organization: Sandia National Lab. (SNL-NM), Albuquerque, NM (United States)
• Sponsoring Organization: USDOE, Washington, DC (United States)
• DOE Contract Number: AC04-94AL85000
• OSTI ID: 102412
• Report Number(s): SAND-95-2007C; CONF-950946-5; ON: DE95017643; CNN: Florida State University AH-5590; TRN: 95:021995
• Resource Relation: Conference: 5. international conference on the chemistry and migration behaviour of actinides and fission products in the geosphere, Saint-Malo (France), 10-15 Sep 1995; Other Information: PBD: 1995
• Country of Publication: United States
• Language: English

Related Subjects

05 NUCLEAR FUELS
40 CHEMISTRY
OXALIC ACID
DISSOCIATION
AMERICIUM
CHEMICAL REACTIONS
OXALATES
BRINES
ALPHA-BEARING WASTES
UNDERGROUND DISPOSAL
EQUILIBRIUM
STABILITY
MATHEMATICAL MODELS
CHLORATES
SODIUM COMPOUNDS
COMPLEXES
WIPP