Sulfidation and Reoxidation of U(VI)-Incorporated Goethite: Implications for U Retention during Sub-Surface Redox Cycling
Olwen Stagg, Katherine Morris, Luke T. Townsend, Kristina O. Kvashnina, Michael L. Baker, Ryan L. Dempsey, Liam Abrahamsen-Mills, Samuel Shaw
Abstract
in the sulfidized system along with a persistent U(V) component. On reoxidation, U was associated with an iron (oxyhydr)oxide phase either as an adsorbed uranyl (approximately 65%) or an incorporated U (35%) species. These findings support the overarching concept of iron (oxyhydr)oxides acting as a barrier to U migration in the environment, even under fluctuating redox conditions.
Topics & Concepts
GoethiteSulfidationRedoxCyclingChemistryEnvironmental chemistryChemical engineeringInorganic chemistryMineralogyMaterials scienceAdsorptionPhysical chemistryCatalysisOrganic chemistryEngineeringHistoryArchaeologyRadioactive element chemistry and processingGeochemistry and Geologic MappingRadioactive contamination and transfer