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

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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 ... continued below

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Jensen, M. P.; Chiarizia, R.; Ferraro, J. R.; Borkowski, M.; Nash, K. L.; Thiyagarajan, P. et al. June 14, 2001.

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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).

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  • 16th International Solvent Extraction Conference (ISEC 2002), Cape Town (ZA), 03/17/2002--03/21/2002

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  • Report No.: ANL/CHM/CP-103998
  • Grant Number: W-31-109-ENG-38
  • Office of Scientific & Technical Information Report Number: 797890
  • Archival Resource Key: ark:/67531/metadc740221

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  • June 14, 2001

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  • Oct. 19, 2015, 7:39 p.m.

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  • March 22, 2016, 9:34 p.m.

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Jensen, M. P.; Chiarizia, R.; Ferraro, J. R.; Borkowski, M.; Nash, K. L.; Thiyagarajan, P. et al. New insights in third phase formation in the U(VI)-HNO{sub 3}, TBP-alkane system., article, June 14, 2001; Illinois. (digital.library.unt.edu/ark:/67531/metadc740221/: accessed August 19, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.