Radionuclide reactions with groundwater and basalts from Columbia River basalt formations

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Chemical reactions of radionuclides with geologic materials found in Columbia River basalt formations were studied. The objective was to determine the ability of these formations to retard radionuclide migration from a radioactive waste repository located in deep basalt. Reactions that can influence migration are precipitation, ion-exchange, complexation, and oxidation-reduction. These reactions were studied by measuring the effects of groundwater composition and redox potential (Eh) on radionuclide sorption on fresh basalt surfaces, a naturally altered basalt, and a sample of secondary minerals associated with a Columbia River basalt flow. In addition, radionuclide sorption isotherms were measured for these materials and reaction ... continued below

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Pages: 47

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Barney, G.S. June 1, 1981.

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Description

Chemical reactions of radionuclides with geologic materials found in Columbia River basalt formations were studied. The objective was to determine the ability of these formations to retard radionuclide migration from a radioactive waste repository located in deep basalt. Reactions that can influence migration are precipitation, ion-exchange, complexation, and oxidation-reduction. These reactions were studied by measuring the effects of groundwater composition and redox potential (Eh) on radionuclide sorption on fresh basalt surfaces, a naturally altered basalt, and a sample of secondary minerals associated with a Columbia River basalt flow. In addition, radionuclide sorption isotherms were measured for these materials and reaction kinetics were determined. The radionuclides studied were /sup 137/Cs, /sup 85/Sr, /sup 75/Se, /sup 95m/Tc, /sup 237/Np, /sup 241/Am, /sup 226/Ra and /sup 237/Pu. The Freundlich equation accurately describes the isotherms when precipitation of radionuclides does not occur. In general, sorption increased in the order: basalt < altered basalt < secondary minerals. This increase in sorption corresponds to increasing surface area and cation exchange capacity. The Eh of the system had a large effect on technetium, plutonium, and neptunium sorption. Technetium(VII), Pu(VI), and Np(V) are reduced to Tc(IV), Pu(IV), and Np(IV), respectively, under Eh conditions expected in deep basalt formations. The kinetics of radionuclide sorption and basalt-groundwater reactions were observed over a period of 18 weeks. Most sorption reactions stabilized after about four weeks. Groundwater composition changed the least in contact with altered basalt. Contact with secondary minerals greatly increased Ca, K, and Mg concentrations in the groundwater.

Physical Description

Pages: 47

Notes

NTIS, PC A03/MF A01.

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  • Northwest regional American Chemical Society meeting, Bozeman, MT, USA, 17 Jun 1981

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  • Other: DE81025506
  • Report No.: RHO-SA-217
  • Report No.: CONF-8106119-1
  • Grant Number: AC06-77RL01030
  • DOI: 10.2172/6468248 | External Link
  • Office of Scientific & Technical Information Report Number: 6468248
  • Archival Resource Key: ark:/67531/metadc1212594

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  • June 1, 1981

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  • July 5, 2018, 11:11 p.m.

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  • Oct. 19, 2018, 12:55 p.m.

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Barney, G.S. Radionuclide reactions with groundwater and basalts from Columbia River basalt formations, report, June 1, 1981; United States. (digital.library.unt.edu/ark:/67531/metadc1212594/: accessed November 14, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.