Actinide Speciation in High Ionic Strength Media

1. Front Matter

   Pages i-x

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2. Actinide Chemistry in High Ionic Strength Media: General Aspects

   1. Front Matter

      Pages 1-1

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   2. Near Field and Far Field Interactions and Data Needs For Geologic Disposal of Nuclear Waste

      • Gregory R. Choppin

      Pages 3-10

   3. Modern Speciation Techniques Applied to Environmental Systems

      • Heino Nitsche, Robert J. Silva, Vinzenz Brendler, Gerhard Geipel, Tobias Reich, Yuri A. Teterin et al.

      Pages 11-38

   4. Modeling the Effect of Ionic Interactions on Radionuclides in Natural Waters

      • Frank J. Millero

      Pages 39-61

   5. Use of Dissolved and Colloidal Actinide Parameters within the 1996 Waste Isolation Pilot Plant Compliance Certification Application

      • Christine T. Stockman, Robert C. Moore

      Pages 63-82

   6. Chemical Species of Plutonium in Hanford Site Radioactive Tank Wastes

      • G. S. Barney, C. H. Delegard

      Pages 83-110

3. Actinide Complexation and Solubility

   1. Front Matter

      Pages 111-111

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   2. Dissociation Constants of Carboxylic Acids at High Ionic Strengths

      • Jiri Mizera, Andrew H. Bond, Gregory R. Choppin, Robert C. Moore

      Pages 113-124

   3. Correlation of Equilibrium Constants with Ionic Strength by Sit, Pitzer and Parabolic Models

      • Miting Du, Gregory R. Choppin

      Pages 125-139

   4. Actinyl(VI) Carbonates in Concentrated Sodium Chloride Solutions: Characterization, Solubility, and Stability

      • W. Runde, M. P. Neu, S. D. Reilly

      Pages 141-151

   5. Solubility of NaNd(CO3)2.6H2O(c) in Mixed Electrolyte (Na-Cl-CO3-HCO3) and Synthetic Brine Solutions

      • Linfeng Rao, Dhanpat Rai, Andrew R. Felmy, Craig F. Novak

      Pages 153-169

   6. Plutonium (VI) Solubility Studies in Savannah River Site High-Level Waste

      • D. G. Karraker

      Pages 171-176

   7. UO2 2+ and NpO2 + Complexation with Citrate in Brine Solutions

      • M. Bronikowski, O. S. Pokrovsky, M. Borkowski, G. R. Choppin

      Pages 177-185

   8. Complexation and Ion Interactions in Am(III)/EDTA/NaCl Ternary System

      • Jian-Feng Chen, Gregory R. Choppin, Robert C. Moore

      Pages 187-197

   9. Interaction of Uranyl with Humic and Fulvic Acids at High Ionic Strength

      • N. Labonne-Wall, G. R. Choppin, C. Lopez, J-M. Monsallier

      Pages 199-211

4. Actinide Colloidal and Microbiological Interactions

   1. Front Matter

      Pages 213-213

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   2. Retardation of Colloidal Actinides Through Filtration in Intrusion Borehole Backfill at the Waste Isolation Pilot Plant (WIPP)

      • Richard Aguilar, Hans W. Papenguth, Fred Rigby

      Pages 215-225

   3. Contribution of Mineral-Fragment Type Pseudo-Colloids to the Mobile Actinide Source Term of the Waste Isolation Pilot Plant (WIPP)

      • John W. Kelly, Richard Aguilar, Hans W. Papenguth

      Pages 227-237

   4. Laboratory Evaluation of Colloidal Actinide Transport at the Waste Isolation Pilot Plant (WIPP): 1. Crushed-Dolomite Column Flow Experiments

      • W. G. Yelton, Y. K. Behl, J. W. Kelly, M. Dunn, J. B. Gillow, A. J. Francis et al.

      Pages 239-251

The management and disposal of radioactive wastes are key international issues requiring a sound, fundamental scientific basis to insure public and environmental protection. Large quantities of existing nuclear waste must be treated to encapsulate the radioactivity in a form suitable for disposal. The treatment of this waste, due to its extreme diversity, presents tremendous engineering and scientific challenges. Geologic isolation of transuranic waste is the approach currently proposed by all nuclear countries for its final disposal. To be successful in this endeavor, it is necessary to understand the behavior of plutonium and the other actinides in relevant environmental media. Conceptual models for stored high level waste and waste repository systems present many sCientific difficulties due to their complexity and non-ideality. For example, much of the high level nuclear waste in the US is stored as alkaline concentrated electrolyte materials, where the chemistry of the actinides under such conditions is not well understood. This lack of understanding limits the successful separation and treatment of these wastes. Also, countries such as the US and Germany plan to dispose of actinide­ bearing wastes in geologic salt deposits. In this case, understanding the speciation and transport properties of actinides in brines is critical for confidence in repository performance and risk assessment activities. Many deep groundwaters underlying existing contaminated sites are also high in ionic strength. Until recently, the scientific basis for describing actinide chemistry in such systems was extremely limited.

• Filtration
• Plutonium
• Uran
• bacteria
• radioactive waste
• toxicity
• hydrogeology

• Chemical Technology Division, Argonne National Laboratory, Argonne, USA

  Donald T. Reed

• Department of Chemistry, Washington State University, Pullman, USA

  Sue B. Clark

• Chemical Sciences Division, Lawrence Berkeley National Laboratory, Berkeley, USA

  Linfeng Rao

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