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Stability of peroxide-containing uranyl minerals
Karrie-Ann Hughes Kubatko1, Katheryn B Helean, Alexandra Navrotsky
1Department of Civil Engineering and Geological Sciences, University of Notre Dame, 156 Fitzpatrick Hall, Notre Dame, IN 46556, USA.
Science (New York, N.Y.)
|November 15, 2003
Summary
Studtite and metastudtite are stable peroxide minerals. Their formation is driven by radioactivity in uranium deposits or nuclear waste, impacting nuclear waste storage.
Area of Science:
- Geochemistry
- Radiochemistry
- Mineralogy
Background:
- Peroxide minerals studtite and metastudtite are rare.
- Alpha radiolysis of water generates hydrogen peroxide (H2O2).
Purpose of the Study:
- To determine the stability of studtite and metastudtite.
- To assess their potential role in nuclear waste alteration.
Main Methods:
- High-temperature oxide-melt solution calorimetry.
- Solubility measurements.
Main Results:
- Studtite has a standard enthalpy of formation of -2344.7 ± 4.0 kJ/mol.
- Studtite and metastudtite are stable in peroxide-rich environments, even at low H2O2 concentrations.
- Radioactivity can induce studtite formation.
Conclusions:
- Studtite and metastudtite are stable under conditions relevant to geological repositories.
- These minerals may alter nuclear waste and spent fuel, affecting long-term storage outcomes.
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