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Estabilidad de los minerales de uranyl que contienen peróxido
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
Resumen
La studtita y la metastudtita son minerales peroxídicos estables. Su formación es impulsada por la radiactividad en depósitos de uranio o residuos nucleares, lo que afecta el almacenamiento de residuos nucleares.
Área de la Ciencia:
- La geoquímica es la geoquímica.
- La radioquímica es la radioquímica.
- La mineralogía es la Mineralogía.
Sus antecedentes:
- Los minerales peróxidos studtita y metastudtita son raros.
- La radiólisis alfa del agua genera peróxido de hidrógeno (H2O2).
Objetivo del estudio:
- Para determinar la estabilidad de la studtita y la metastudtita.
- Evaluar su papel potencial en la alteración de los residuos nucleares.
Principales métodos:
- Calorimetría de alta temperatura con solución de óxido fundido.
- Mediciones de solubilidad. mediciones de solubilidad.
Principales resultados:
- Studtite tiene una entalpía estándar de formación de -2344.7 ± 4.0 kJ/mol.
- La studtita y la metastudtita son estables en ambientes ricos en peróxido, incluso a bajas concentraciones de H2O2.
- La radiactividad puede inducir la formación de studtite.
Conclusiones:
- La studtita y la metastudtita son estables bajo condiciones relevantes para los depósitos geológicos.
- Estos minerales pueden alterar los residuos nucleares y el combustible gastado, afectando los resultados de almacenamiento a largo plazo.
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