Effect of Extent of Natural Subsurface Bioreduction on Fe-mineralogy of Subsurface Sediments
Naturally bioreduced zones with considerable sorbed U were recently identified at a former U mining and processing site at Rifle, CO, USA. Most of the sorbed U appears to be associated with Fe minerals. Variably reduced sediment samples were analyzed by suite of techniques, primarily by room temperature Mössbauer spectroscopy. Fe-oxides of different types and crystallinity, and Fe(II)/Fe(III)-containing clays are dominant in all the sediments. The amounts of poorly crystalline Fe(III)-oxide, however, was lower in the reduced samples. In addition, framboidal pyrites with sorbed U were common in the highly reduced sediments. Overall, the information gained from this work may help develop design field strategies for immobilization and stabilization of U(VI) in contaminated subsurface environments.
- Research Organization:
- Pacific Northwest National Laboratory (PNNL), Richland, WA (US), Environmental Molecular Sciences Laboratory (EMSL)
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AC05-76RL01830
- OSTI ID:
- 979481
- Report Number(s):
- PNNL-SA-69002; 34002; KP1704020
- Journal Information:
- Journal of Physics: Conference Series, 217(1):012047 1-8, Journal Name: Journal of Physics: Conference Series, 217(1):012047 1-8 Journal Issue: 1 Vol. 217
- Country of Publication:
- United States
- Language:
- English
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