Results from a One-Year Leach Test: Long-Term Use of MCC-L


The results of the 1-year leach test led to the following conclusions:

  • The MCC-lP Static Leach Test Method has been demonstrated to be useful for studies up to 1 year at temperatures up to 90°C.

  • Accurate measurements of leachant volume at the start and the end of the test are important.

  • PNL 76-68 glass appears to continue to alter, albeit at a significantly reduced rate, even though the solution concentrations of many elements are saturated or supersaturated with respect to alteration phases.

  • The original surface of the glass was still present after 1 year, evidence that the gel layer will slowly get thicker but dissolution will not occur, or will occur at extremely slow rates.

  • At 40°C, more than 1 year is required to reach saturation of some important elements. Even at 90°C, testing beyond 1 year is needed to define alteration rates and details of the leaching mechanisms.

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Correspondence to D. M. Strachan.

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This work was supported by the U.S. Department of Energy under contract DE-AC06-76RLO 1830.

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Strachan, D.M. Results from a One-Year Leach Test: Long-Term Use of MCC-L. MRS Online Proceedings Library 11, 181 (1981).

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