Actinide immobilization in the subsurface environment by in-situ treatment with a hydrolytically unstable organophosphorus complexant: Uranyl uptake by calcium phytate

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In addition to naturally occurring uranium and thorium, actinide ions exist in the subsurface environment as a result of accidental releases and intentional disposal practices associated with nuclear weapons production. These species present a significant challenge to cost-effective remediation of contaminated environments. An attractive approach to decreasing the probability of actinide migration in the subsurface is to transform the ions into a less mobile form by remote treatment. We have under development a process which relies on a polyfunctional organophosphorus complexant to sequester the mobile metal ions by complexation/cation exchange in the near term, and to subsequently decompose, transforming the ... continued below

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12 p.

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Nash, K.L.; Jensen, M.P. & Schmidt, M.A. December 31, 1997.

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In addition to naturally occurring uranium and thorium, actinide ions exist in the subsurface environment as a result of accidental releases and intentional disposal practices associated with nuclear weapons production. These species present a significant challenge to cost-effective remediation of contaminated environments. An attractive approach to decreasing the probability of actinide migration in the subsurface is to transform the ions into a less mobile form by remote treatment. We have under development a process which relies on a polyfunctional organophosphorus complexant to sequester the mobile metal ions by complexation/cation exchange in the near term, and to subsequently decompose, transforming the actinides into insoluble phosphate mineral forms in the long term. Studies to date include identification of a suitable organophosphorus reagent, profiling of its decomposition kinetics, verification of the formation of phosphate mineral phases upon decomposition of the reagent, and extensive comparison of the actinide uptake ability of the calcium salt of the reagent as compared with hydroxyapatite. In this report, we briefly describe the process with focus on the cation exchange behavior of the calcium salt of the organophosphorus sequestrant.

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12 p.

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INIS; OSTI as DE97054214

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  • Actinides `97: international conference on actinides, Baden-Baden (Germany), 21-26 Sep 1997

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  • Other: DE97054214
  • Report No.: ANL/CHM/CP--92802
  • Report No.: CONF-970907--
  • Grant Number: W-31-109-ENG-38
  • Office of Scientific & Technical Information Report Number: 570130
  • Archival Resource Key: ark:/67531/metadc696613

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Office of Scientific & Technical Information Technical Reports

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  • December 31, 1997

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  • Aug. 14, 2015, 8:43 a.m.

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  • Dec. 16, 2015, 10:41 a.m.

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Nash, K.L.; Jensen, M.P. & Schmidt, M.A. Actinide immobilization in the subsurface environment by in-situ treatment with a hydrolytically unstable organophosphorus complexant: Uranyl uptake by calcium phytate, article, December 31, 1997; Illinois. (digital.library.unt.edu/ark:/67531/metadc696613/: accessed December 15, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.