Solubility-limited concentrations and aqueous speciation fo U, Pu, Np, Am and Tc: Comparison between results of Bruno and Sellin (1992) and calculations using GEMBOCHS (version R16)

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Aqueous speciation and solubility-limited concentrations of U, Pu, Np, Am and Tc were calculated with EQ3/6 and version comR16 of the GEMBOCHS data base for comparison to similar calculations made by Bruno and Sellin (1992) for the SKB 91 exercise. Bruno and Sellin utilized data from the older 0288 version of the EQ3/6 data base but substituted their own data sets for U and Pu. Equilibria were computed in representative fresh and saline Finnsjoen-waters under oxidizing and reducing conditions. The comparisons showed that slight discrepancies exist for U because Bruno and Sellin used thermodynamic data from sources that pre-date the ... continued below

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13 p.

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Bruton, C.J. May 1, 1995.

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Description

Aqueous speciation and solubility-limited concentrations of U, Pu, Np, Am and Tc were calculated with EQ3/6 and version comR16 of the GEMBOCHS data base for comparison to similar calculations made by Bruno and Sellin (1992) for the SKB 91 exercise. Bruno and Sellin utilized data from the older 0288 version of the EQ3/6 data base but substituted their own data sets for U and Pu. Equilibria were computed in representative fresh and saline Finnsjoen-waters under oxidizing and reducing conditions. The comparisons showed that slight discrepancies exist for U because Bruno and Sellin used thermodynamic data from sources that pre-date the NEA data base. This NEA data base is incorporated into GEMBOCHS. Discrepancy also exists for Pu under reducing conditions because of the choice of thermodynamic data for solid Pu(OH){sub 4}. GEMBOCHS predicts Pu concentrations in solution that are about 1 to 2 orders of magnitude greater than Bruno and Sellin`s values. Np concentration in the oxidizing saline water computed with GEMBOCHS is 20 times higher than Bruno and Sellin`s value. Under reducing conditions, however, GEMBOCHS predicts an order of magnitude less Np in solution. GEMBOCHS computes Am concentrations in solution about 2--3-times larger than those of Bruno and Sellin. Bruno and Sellin`s data base lacks the aqueous species Am(CO{sub 3}){sub 2}{sup {minus}} although this species occurs only sparingly (< 10 mol%) in the fresh waters. Overall Tc data bases differ significantly because more recent critical compilations of Tc data have been incorporated into GEMBOCHS since Bruno and Sellin`s 0288 version. Nonetheless, results for Tc are broadly similar, although GEMBOCHS predicts Tc concentrations about 1.7 times higher than Bruno and Sellin`s values for the reducing waters.

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13 p.

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INIS; OSTI as DE95015124

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  • Other Information: PBD: May 1995

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  • Other: DE95015124
  • Report No.: UCRL-ID--121177
  • Grant Number: W-7405-ENG-48
  • DOI: 10.2172/102488 | External Link
  • Office of Scientific & Technical Information Report Number: 102488
  • Archival Resource Key: ark:/67531/metadc620383

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  • May 1, 1995

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  • June 16, 2015, 7:43 a.m.

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  • Feb. 23, 2016, 12:18 p.m.

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Bruton, C.J. Solubility-limited concentrations and aqueous speciation fo U, Pu, Np, Am and Tc: Comparison between results of Bruno and Sellin (1992) and calculations using GEMBOCHS (version R16), report, May 1, 1995; California. (digital.library.unt.edu/ark:/67531/metadc620383/: accessed December 13, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.