New insights in third phase formation in the U(VI)-HNO{sub 3}, TBP-alkane system.
Conference
·
OSTI ID:797890
In this work, the system U(VI)-HNO{sub 3}-tributylphosphate (TBP)-n-dodecane has been revisited with the objective of gaining coordination chemistry and structural information on the species that are formed in the organic phase before and after third phase formation. Chemical analyses, spectroscopic and EXAFS data indicate that U(VI) is extracted as the UO{sub 2}(NO{sub 3}){sub 2} {center_dot} 2TBP adduct, while the third phase species has the composition UO{sub 2}(NO{sub 3}){sub 2} {center_dot} 2TBP {center_dot} HNO{sub 3}. Small-angle neutron scattering (SANS) data reveal the presence in the organic phase, both before and after phase splitting, of ellipsoidal aggregates whose formation seems to depend more on the extraction of HNO{sub 3} than that of U(VI).
- Research Organization:
- Argonne National Lab., IL (US)
- Sponsoring Organization:
- US Department of Energy (US)
- DOE Contract Number:
- W-31109-ENG-38
- OSTI ID:
- 797890
- Report Number(s):
- ANL/CHM/CP-103998
- Country of Publication:
- United States
- Language:
- English
Similar Records
Third phase formation revisited: the U(VI), HNO{sub 3} - TBP, n-dodecane system.
SANS study of third phase formation in the U(VI)-HNO{sub 3}/ TBP-n-dodecane system.
SANS study of third phase formation in the Th(IV)-HNO{sub 3}/ TBP-n-octane system.
Journal Article
·
Tue Dec 31 23:00:00 EST 2002
· Solvent Extr. Ion Exch.
·
OSTI ID:949724
SANS study of third phase formation in the U(VI)-HNO{sub 3}/ TBP-n-dodecane system.
Journal Article
·
Tue Dec 31 23:00:00 EST 2002
· Sep. Sci. Technol.
·
OSTI ID:949447
SANS study of third phase formation in the Th(IV)-HNO{sub 3}/ TBP-n-octane system.
Journal Article
·
Tue Dec 31 23:00:00 EST 2002
· Sep. Sci. Technol.
·
OSTI ID:949448