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- Title
Enhanced Radionuclide Immobilization and Flow Path Modifications by Dissolution and Secondary Precipitates.
- Authors
Wooyong Um; Serne, R. Jeffrey; Yabusaki, Steven B.; Owen, Antoinette T.
- Abstract
In this article, the effects of secondary mineral precipitates, formed after contacting solids with simulated caustic wastes, on the flow path changes and radionuclide immobilization were investigated by reacting quartz, a mixture of quartz and biotite, and a Hanford sediment with simulated caustic tank waste solution. Caustic radioactive wastes that have leaked at Hanford Site, Richland, Washington, induce mineral dissolution and subsequent secondary precipitation that influence the fate and transport of contaminants present in the waste solutions. Continuous silicon dissolution and concomitant secondary mineral precipitation were the principal reactions observed in both batch and flow-through tests. Nitrate-cancrinite was the dominant secondary precipitate on mineral surfaces after 3- to 10-days reaction times in batch experiments. X-ray microtomography images of a reacted quartz column revealed that secondary precipitates cemented quartz grains together and modified pore geometry in the center of the column.
- Subjects
WASHINGTON (State); RADIOISOTOPES in soil chemistry; BIOTITE; QUARTZ; HANFORD Site (Wash.); RADIOACTIVE waste sites
- Publication
Journal of Environmental Quality, 2005, Vol 34, Issue 4, p1404
- ISSN
0047-2425
- Publication type
Article
- DOI
10.2134/jeq2004.0395