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Uranium transport in acidic brines under reducing conditions
Alexander Timofeev1, Artaches A Migdisov2, Anthony E Williams-Jones3
1Department of Earth & Planetary Sciences, McGill University, 3450 University Street, Montreal, QC, H3A 0E8, Canada. alexander.timofeev@mail.mcgill.ca.
Nature Communications
|April 18, 2018
Summary
Uranium mobility in high-temperature brines is re-evaluated. New experimental evidence shows uranium is mobile under reducing conditions, challenging previous assumptions about uranium immobility.
Area of Science:
- Geochemistry
- Nuclear Chemistry
- Environmental Science
Background:
- Uranium behavior is critical in natural ore deposit formation and nuclear reactor operations.
- Uranium mobility has been understood to be high in oxidized (U6+) states and low in reduced (U4+) states.
Purpose of the Study:
- To investigate uranium mobility in high-temperature acidic brines under reducing conditions.
- To challenge the established assumption of uranium immobility in reduced environments.
Main Methods:
- Experimental studies using high-temperature (>100°C) acidic brines.
- Identification and characterization of uranium species under varying redox conditions.
Main Results:
- A novel uranium chloride species (UCl4°) was identified.
- This new species demonstrates greater stability under reducing conditions compared to oxidized conditions.
- Experimental evidence invalidates the assumption of uranium immobility under reducing conditions.
Conclusions:
- Uranium exhibits mobility even under reducing conditions in high-temperature brines.
- This finding necessitates a re-evaluation of uranium mobility in geological and nuclear contexts.
- Reducing conditions alone do not guarantee uranium immobility.
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