Bacterially enhanced dissolution of meta-autunite
- Windsor
The release of U from the mineral meta-autunite {l_brace}Ca[(UO{sub 2})(PO{sub 2})](H{sub 2}O){sub 6}{r_brace} was evaluated using spectroscopy, aqueous geochemistry, and electron microscopy in a minimal media with the dissimilatory metal-reducing bacterium Shewanella putrefaciens 200R. The onset of anaerobic conditions resulted in the rapid release of U and phosphate to solution followed by the reprecipitation of meta-autinite. Spectroscopy measurements (XANES) indicated that the U was not released via reduction during the bacterial incubations, but instead dissolution was promoted by uptake and immobilization of P by the bacterial cells. Our results suggest that U(VI) in 'refractory' P mineral phases may be mobilized from U mill tailings and/or U disposal sites and that the nutrient status (P) of the geologic setting may be a predictor for the lability of U in these environments.
- Research Organization:
- Advanced Photon Source (APS), Argonne National Laboratory (ANL), Argonne, IL (US)
- Sponsoring Organization:
- USDOE
- OSTI ID:
- 1007010
- Journal Information:
- Am. Mineral., Journal Name: Am. Mineral. Journal Issue: (11-12) ; 11, 2008 Vol. 93; ISSN 0003-004X
- Country of Publication:
- United States
- Language:
- ENGLISH
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