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The migration of low levels of plutonium has been observed at the Nevada National Security Site (NNSS) and attributed to colloids. To better understand the mechanism(s) of colloidfacilitated transport at this site, we performed flow cell desorption experiments with mineral colloid suspensions produced by hydrothermal alteration of NNSS nuclear melt glass, residual material left behind from nuclear testing. Three different colloid suspensions were used, 1) colloidal material from hydrothermal alteration of nuclear melt glass at 140 °C, 2) at 200 °C, and 3) plutonium sorbed to SWy-1 montmorillonite at room temperature. The 140 23°C sample contained only montmorillonite while zeolite and other phases were present in the 200 °C sample. Overall, more plutonium was desorbed from the 140 °C colloids (~9-16%), than from the 200 °C colloids (~4-8 %). Furthermore, at the end of the 4.5 day flow cell

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