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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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). https://doi.org/10.1557/PROC-11-181