Startseite Dissolution of poorly soluble uranyl phosphate phases in the Metaautunite Subgroup under uranyl peroxide cage cluster forming conditions
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Dissolution of poorly soluble uranyl phosphate phases in the Metaautunite Subgroup under uranyl peroxide cage cluster forming conditions

  • Haylie L. Lobeck , Enrica Balboni , Connor J. Parker , Tsuyoshi A. Kohlgruber , Mengyu Xu , Sara Boukdad , Henry M. Ridder , Hrafn Traustason , Jordan K. Isner , Ewa A. Dzik und Peter C. Burns EMAIL logo
Veröffentlicht/Copyright: 23. Januar 2020
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American Mineralogist
Aus der Zeitschrift American Mineralogist Band 105 Heft 2

Abstract

Uranyl phosphate minerals are widespread in uranium deposits and normally exhibit very low solubility in aqueous systems. Uranyl phosphates of the autunite group and metaautunite subgroup impact the mobility of uranium in the environment and have inspired groundwater remediation strategies that emphasize their low solubility. The importance of soluble uranium-bearing macro-anions, including nanoscale uranyl peroxide cage clusters, is largely unexplored relative to solubilization of normally low-solubility uranium minerals. Eight synthetic analogs of metaautunite subgroup minerals have been prepared and placed in various alkaline aqueous solutions containing hydrogen peroxide and tetraethylammonium hydroxide. Each uranyl phosphate studied has a topologically identical anionic sheet of uranyl square bipyramids and phosphate tetrahedra combined with various cations (Li+, Na+, K+, Rb+, Cs+, Mg2+, Ca2+, Ba2+) and water in the interlayer. Uranyl peroxides formed under many of the experimental conditions examined, including solid studtite [(UO2)(O2)(H2O)2](H2O)2 and soluble uranyl peroxide cage clusters containing as many as 28 uranyl ions. Uranyl phosphate solids in contact with solutions in which uranyl peroxide cage clusters formed dissolved extensively or completely. The greatest dissolution of uranyl phosphates occurred in systems that contained cations with larger hydrated radii, Li+ and Na+. The details of the uranium speciation in solution depended on the pH and counter cations provided from the interlayers of the uranyl phosphate solids.

Keywords: Metaautunite; dissolution; uranium; studtite; uranyl peroxide nanoclusters; peroxide; uranyl phosphate

Orcid 0000-0002-2319-9628

† Present Address: Glenn T. Seaborg Institute, Physical & Life Sciences Directorate, Lawrence Livermore National Laboratory, Livermore, CA 94550, U.S.A.

‡ Present Address: Environmental Engineering and Earth Sciences, Clemson University, Anderson, SC 29625, U.S.A.

Acknowledgments and Funding

This research was funded by the U.S. Department of Energy, National Nuclear Security Administration (DE-NA0003763). We thank the Center for Environmental Science and Technology, Materials Characterization Facility, and Mass Spectrometry and Proteomics Facility at the University of Notre Dame for the instrumentation used in this work. Additional thanks are extended to Aaron S. Donahue for his assistance with MATLAB and development of the color plot figures.

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Received: 2019-05-07
Accepted: 2019-09-28
Published Online: 2020-01-23
Published in Print: 2020-02-25

© 2020 Walter de Gruyter GmbH, Berlin/Boston

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https://doi.org/10.2138/am-2020-7106
Schlagwörter für diesen Artikel
Metaautunite; dissolution; uranium; studtite; uranyl peroxide nanoclusters; peroxide; uranyl phosphate

Artikel in diesem Heft

  1. A method to estimate the pre-eruptive water content of basalts: Application to the Wudalianchi–Erkeshan–Keluo volcanic field, Northeastern China
  2. A new emerald occurrence from Kruta Balka, Western Peri-Azovian region, Ukraine: Implications for understanding the crystal chemistry of emerald
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  5. Constraints on non-isothermal diffusion modeling: An experimental analysis and error assessment using halogen diffusion in melts
  6. Machiite, Al2Ti3O9, a new oxide mineral from the Murchison carbonaceous chondrite: A new ultra-refractory phase from the solar nebula
  7. Partitioning of V and 19 other trace elements between rutile and silicate melt as a function of oxygen fugacity and melt composition: Implications for subduction zones
  8. Cl-bearing fluorcalciobritholite in high-Ti basalts from Apollo 11 and 17: Implications for volatile histories of late-stage lunar magmas
  9. Amphibole-rich cumulate xenoliths in the Zhazhalong intrusive suite, Gangdese arc: Implications for the role of amphibole fractionation during magma evolution
  10. Extraterrestrial, shock-formed, cage-like nanostructured carbonaceous materials
  11. Minerals Matter
  12. Pyrite: Fool’s gold records starvation of bacteria
  13. American Mineralogist thanks the 2019 reviewers
  14. Book Review
  15. Geological Belts, Plate Boundaries, and Mineral Deposits in Myanmar
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Heruntergeladen am 26.9.2025 von https://www.degruyterbrill.com/document/doi/10.2138/am-2020-7106/html
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