Authors / CoAuthors
Migdisov, A. | Bastrakov, E. | Alcorn, C. | Reece, M. | Boukhalfa, H. | Capporuscio, F.A. | Jove-Colon, C.
Abstract
The stabilities of uranyl-carbonate and uranyl-hydroxide aqueous complexes were experimentally determined at temperatures ranging from 25 to 125 °C using in situ UV–vis and Raman spectroscopic techniques. Combined with earlier determinations of the stability of chloride, sulfate, and hydroxide complexes at temperatures up to 250 °C, these data permit to create a consolidated dataset suitable for modeling of U(VI) mobilization in natural systems. The parameters of the Modified Ryzhenko-Bryzgalin and the Helgeson-Kirkham-Flowers (HKF) Equations of State (EoS) were derived based on this dataset and used for thermodynamic modeling different scenarios of U(VI) mobilization. These models suggest that at conditions relevant to natural systems, carbonate-mediated transport of U(VI) is likely suppressed by the high stability of solid UO2(OH)2 and Na2U2O7. In contrast, sulfate-mediated mobilization mechanisms are highly efficient at acidic and near-neutral pH conditions and can lead to effective hydrothermal mobilization of U(VI). <b>Citation:</b> A. Migdisov, E. Bastrakov, C. Alcorn, M. Reece, H. Boukhalfa, F.A. Capporuscio, C. Jove-Colon, A spectroscopic study of the stability of uranyl-carbonate complexes at 25–150 °C and re-visiting the data available for uranyl-chloride, uranyl-sulfate, and uranyl-hydroxide species, <i>Geochimica et Cosmochimica Acta</i>, 2024, ISSN 0016-7037, https://doi.org/10.1016/j.gca.2024.04.023.
Product Type
document
eCat Id
148694
Contact for the resource
Resource provider
Point of contact
Cnr Jerrabomberra Ave and Hindmarsh Dr GPO Box 378
Canberra
ACT
2601
Australia
Point of contact
Keywords
- ( Project )
-
- Critical Minerals
-
- mineral systems
-
- Geochemistry
-
- hydrogeochemistry
- theme.ANZRC Fields of Research.rdf
-
- Inorganic Geochemistry
-
- hydrothermal
-
- uranyl
-
- thermodynamic stability
-
- Published_External
Publication Date
2024-05-28T22:36:44
Creation Date
2023-08-17T22:00:00
Security Constraints
Status
completed
Purpose
Release of a new dataset of thermodynamic properties of aqueous uranium species for mineral systems modelling.
Maintenance Information
notPlanned
Topic Category
geoscientificInformation
Series Information
Geochimica et Cosmochimica Acta
Lineage
<div>Mineral systems modelling and concepts</div>
Parent Information
Extents
[-54.75, -9.2402, 112.92, 159.11]
Reference System
Spatial Resolution
Service Information
Associations
Source Information