Master of Science (MS)
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Uranium, Remediation, Ammonia, Hanford, Vadose Zone
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Of the many toxic chemicals released into the Hanford vadose zone over the decades of nuclear weapons production, uranium has emerged as a contaminant of significant interest. The ammonia gas injection remediation method has been identified as a promising approach towards mitigating the risks to the ecosystem by limiting the mobility of the radionuclide in the vadose zone. The remediation method was replicated using synthetic porewater solutions with a range of constituent concentrations equal to that of the Hanford 200 Area vadose zone. The uranium-bearing products of the remediation method were characterized using kinetic phosphorescence analysis for aqueous uranium, scanning electron microscopy with energy dispersive spectroscopy and electron microprobe for imaging and elemental analysis, and a sequential extraction procedure modified for the sample precipitates. Evaluation revealed that the resultant uranium-bearing solids likely took the form of uranium-silicates and uranium carbonates, with the latter being precipitated primarily in mid-to-high bicarbonate samples.
Lapierre, Robert Michael, "Characterization of the Uranium-Bearing Phases Produced by Novel Remediation Technologies for Sequestration of Mobile Radiological Contaminants in the Hanford 200 Area Vadose Zone" (2018). FIU Electronic Theses and Dissertations. 3847.
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