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Title: New insights in third phase formation in the U(VI)-HNO{sub 3}, TBP-alkane system.

Abstract

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).

Authors:
; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab., IL (US)
Sponsoring Org.:
US Department of Energy (US)
OSTI Identifier:
797890
Report Number(s):
ANL/CHM/CP-103998
TRN: US0202969
DOE Contract Number:  
W-31-109-ENG-38
Resource Type:
Conference
Resource Relation:
Conference: 16th International Solvent Extraction Conference (ISEC 2002), Cape Town (ZA), 03/17/2002--03/21/2002; Other Information: PBD: 14 Jun 2001
Country of Publication:
United States
Language:
English
Subject:
72 PHYSICS OF ELEMENTARY PARTICLES AND FIELDS; CHEMISTRY; NEUTRONS; SCATTERING; SOLVENT EXTRACTION

Citation Formats

Jensen, M P, Chiarizia, R, Ferraro, J R, Borkowski, M, Nash, K L, Thiyagarajan, P, and Littrell, K C. New insights in third phase formation in the U(VI)-HNO{sub 3}, TBP-alkane system.. United States: N. p., 2001. Web.
Jensen, M P, Chiarizia, R, Ferraro, J R, Borkowski, M, Nash, K L, Thiyagarajan, P, & Littrell, K C. New insights in third phase formation in the U(VI)-HNO{sub 3}, TBP-alkane system.. United States.
Jensen, M P, Chiarizia, R, Ferraro, J R, Borkowski, M, Nash, K L, Thiyagarajan, P, and Littrell, K C. Thu . "New insights in third phase formation in the U(VI)-HNO{sub 3}, TBP-alkane system.". United States. https://www.osti.gov/servlets/purl/797890.
@article{osti_797890,
title = {New insights in third phase formation in the U(VI)-HNO{sub 3}, TBP-alkane system.},
author = {Jensen, M P and Chiarizia, R and Ferraro, J R and Borkowski, M and Nash, K L and Thiyagarajan, P and Littrell, K C},
abstractNote = {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).},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {2001},
month = {6}
}

Conference:
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