Transport and reaction kinetics at the glass:solution interface region: Results of repository-oriented leaching experiments

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Repository-oriented leaching experiments involving Savannah River Laboratory (SRL) 165 type glass under a {gamma}-radiation field (1 = 0.2 x 10{sup 4} R/h) have been performed by the Nevada Nuclear Waste Storage Investigations (NNWSI) project. In this communication, we discuss glass surface analyses obtained by SEM, nuclear resonance profiling, and SIMS together with leachate solution data in relation to a mechanism that couples diffusion, hydrolysis (etching and gelation), and precipitation to qualitatively describe the release of different glass components to the leachant solutions. The release of mobile (e.g., Li) and partly mobile (e.g., B) species is controlled primarily by interdiffusion with ... continued below

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15 p.

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Abrajano, T.A. Jr. & Bates, J.K. December 31, 1986.

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Description

Repository-oriented leaching experiments involving Savannah River Laboratory (SRL) 165 type glass under a {gamma}-radiation field (1 = 0.2 x 10{sup 4} R/h) have been performed by the Nevada Nuclear Waste Storage Investigations (NNWSI) project. In this communication, we discuss glass surface analyses obtained by SEM, nuclear resonance profiling, and SIMS together with leachate solution data in relation to a mechanism that couples diffusion, hydrolysis (etching and gelation), and precipitation to qualitatively describe the release of different glass components to the leachant solutions. The release of mobile (e.g., Li) and partly mobile (e.g., B) species is controlled primarily by interdiffusion with water species across the interdiffusion zone. Glass components that are immobile in the interdiffusion zone are released to the solution by etching. For prediction of long-term steady-state concentrations of glass components with low solubility, the relative rates of release from the glass and secondary mineral precipitation must be taken into account.

Physical Description

15 p.

Notes

NTIS, PC A02/MF A01; OSTI as DE87006975

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  • Materials Research Society (MRS) fall meeting, Boston, MA (United States), 1-5 Dec 1986

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  • Other: DE87006975
  • Report No.: CONF-861207--84
  • Grant Number: W-31109-ENG-38
  • DOI: 10.2172/59992 | External Link
  • Office of Scientific & Technical Information Report Number: 59992
  • Archival Resource Key: ark:/67531/metadc696351

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  • December 31, 1986

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  • Aug. 14, 2015, 8:43 a.m.

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  • Dec. 16, 2015, 4:49 p.m.

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Abrajano, T.A. Jr. & Bates, J.K. Transport and reaction kinetics at the glass:solution interface region: Results of repository-oriented leaching experiments, report, December 31, 1986; Illinois. (digital.library.unt.edu/ark:/67531/metadc696351/: accessed August 20, 2017), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.