Extended x-ray adsorption fine structure studies of Cs dibenzo-18-crown-6-ether complexes

Conference · Sun Dec 31 04:00:00 EST 1995

OSTI ID:214980

Kemner, K M; Elam, W T ^[1]; Hunter, D B; Bertsch, P M ^[2]

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1. Naval Research Lab., Washington, DC (United States)
2. Savannah River Ecology Lab., Aiken, SC (United States)

Development of effective and contaminant specific waste isolation and stabilization technologies requires molecular level information on contaminant sorbent/chelator interactions. {sup 137}Cs is a common component of nuclear waste streams that must be isolated to reduce waste volume. We have used the extended X-ray absorption fine structure (EXAFS) technique to investigate the local structure of {sup 133}Cs+-dibenzo-18-crown-6 ether complexes in non-aqueous solution and powder forms. Analyses of solution complexes indicates contact pairing as e compared to non-contact (i.e. solvent separated) pairing of the Cs-crown ether complexes with the halide anion to form ternary complexes. Recrystallization of the complexes to the solid form resulted in the redistribution of Cs-halide salt as a distinct phase from the crown ether. These data illustrate the importance of direct measurement of solution phase chemical speciation without sample modification.

• OSTI ID: 214980
• Report Number(s): CONF-950801--
• Country of Publication: United States
• Language: English

Related Subjects

05 NUCLEAR FUELS
66 PHYSICS
CESIUM 133
CESIUM 137
CHELATES
CHEMICAL BONDS
CROWN ETHERS
FINE STRUCTURE
MOLECULAR STRUCTURE
RADIOACTIVE WASTE PROCESSING
RECRYSTALLIZATION
SEPARATION PROCESSES
STABILIZATION