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MCC-1: A Standard Leach Test for Nuclear Waste Forms

D.M. Strachan, R. P. Turcotte, B. O. Barnes

Nuclear Technology

Volume 56 / Number 2 / February 1982 / Pages 306-309


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A Materials Characterization Center (MCC) has been established by the U.S. Department of Energy at the Pacific Northwest Laboratory (PNL). Five proposed standard leach tests and typical results using the MCC-1 static test are presented. For the boro-silicate glass studied (PNL 76-78), fivefold replicate experiments show that errors in elemental leach values are usually less than ±10%. Regular time-dependent leach curves are obtained, and no significant difference is observed between pure water and simulated silicate/bicarbonate groundwater results. Leaching in salt brine is quite different, especially as shown by elemental depth profiles in the solid; these profiles show significant magnesium penetration into the gel layer from the brine solution.

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