Over the past two years, there has been an intense effort to understand the chemistry of mercury across the Savannah River Site's High-Level liquid waste flowsheet to determine the impacts of various mercury species. This effort began after high concentrations of mercury were measured in the leachates from a toxicity characteristic leaching procedure (TCLP) test on the low-level cementitious waste form produced in the Savannah River Saltstone facility. Speciation at specialized off-site laboratories showed the dominant form of leached mercury was the methylmercury cation. Neither the source of the methylmercury nor its concentration in the Saltstone feed was well established at the time of this testing.

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