Geochemical and Geophysical Changes during Ammonia Gas Treatment of Vadose Zone Sediments for Uranium Remediation
Journal Article
·
· Vadose Zone Journal, 11(4)
NH3 gas treatment of low water content sediments resulted in a significant decrease in aqueous and adsorbed uranium, which is attributed to incorporation into precipitates. Uranium associated with carbonates showed little change. Uranium associated with hydrous silicates such as Na-boltwoodite showed a significant decrease in mobility but no change in Na-boltwoodite concentration (by EXAFS/XANES), so is most likely caused by non-U precipitate coatings. Complex resistivity changes occurred in the sediment during NH3 and subsequent N2 gas injection, indicating ERT/IP could be used at field scale for injection monitoring.
- 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:
- 1059041
- Report Number(s):
- PNNL-SA-86840; 23593; 830403000
- Journal Information:
- Vadose Zone Journal, 11(4), Journal Name: Vadose Zone Journal, 11(4)
- Country of Publication:
- United States
- Language:
- English
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