Separation of americium from europium by solvent extraction from aqueous phosphonate media

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Complexes between Am{sup 3+} or Eu{sup 3+} and phosphonoacetic acid differ in relative stability in accord with the electrostatic model of cation binding. The smaller Eu{sup 3+} cation forms stronger complexes with PAA than the larger Am{sup 3+} cation. The observed metal complexes in the acid range from 0.005 M to 0.02 M (at I= 0.5 M) are Eu(HL){sup +}, Eu(H{sub 3}L){sub 2}{sup +}, Eu(HL){sub 2}{sup {minus}} and Am(H{sub 2}L){sup 2+}, Am(HL){sup +}, Am(H{sub 2}L){sub 2}{sup +}. When used as a holdback reagent, PAA slightly enhances the separation of Am/Eu when used with sulfonic acids or CMPO/nitrate, but reduces separation ... continued below

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10 p.

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Ensor, D.D. & Nash, K.L. December 31, 1994.

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  • Ensor, D.D. Tennessee Technological Univ., Cookeville, TN (United States). Dept. of Chemistry
  • Nash, K.L. Argonne National Lab., IL (United States)

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Complexes between Am{sup 3+} or Eu{sup 3+} and phosphonoacetic acid differ in relative stability in accord with the electrostatic model of cation binding. The smaller Eu{sup 3+} cation forms stronger complexes with PAA than the larger Am{sup 3+} cation. The observed metal complexes in the acid range from 0.005 M to 0.02 M (at I= 0.5 M) are Eu(HL){sup +}, Eu(H{sub 3}L){sub 2}{sup +}, Eu(HL){sub 2}{sup {minus}} and Am(H{sub 2}L){sup 2+}, Am(HL){sup +}, Am(H{sub 2}L){sub 2}{sup +}. When used as a holdback reagent, PAA slightly enhances the separation of Am/Eu when used with sulfonic acids or CMPO/nitrate, but reduces separation efficiency with HDEHP. In a CMPO/SCN{sup {minus}} extraction system which favors extraction of Am over Eu, addition of PAA increases the separation efficiency by a factor of 2-3 at 0.3 M PAA/0.5 M SCN{sup {minus}}. The calculated stability constants can be used to explain the separation factors, but do not always accurately predict metal distribution ratios in the CMPO systems, implying that there are details of this system which have not been fully elucidated.

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10 p.

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OSTI as DE95012269

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  • 207. spring national meeting of the American Chemical Society (ACS), San Diego, CA (United States), 13-18 Mar 1994

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  • Other: DE95012269
  • Report No.: ANL/CHM/CP--85752
  • Report No.: CONF-940301--47
  • Grant Number: W-31-109-ENG-38
  • Office of Scientific & Technical Information Report Number: 83026
  • Archival Resource Key: ark:/67531/metadc782861

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  • December 31, 1994

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  • Dec. 3, 2015, 9:30 a.m.

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  • Feb. 1, 2016, 1:45 p.m.

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Ensor, D.D. & Nash, K.L. Separation of americium from europium by solvent extraction from aqueous phosphonate media, article, December 31, 1994; Illinois. (digital.library.unt.edu/ark:/67531/metadc782861/: accessed August 23, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.