Association of Actinides with Microorganisms and Clay: Implications for Radionuclide Migration from Waste-Repository Sites
| Autor: | Takuya Nankawa, Takuo Ozaki, Arokiasamy J. Francis, Yoshinori Suzuki, Naofumi Kozai, Toshihiko Ohnuki, Fuminori Sakamoto |
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| Rok vydání: | 2010 |
| Předmět: |
biology
Potassium Radiochemistry chemistry.chemical_element Sorption Bacillus subtilis Actinide Uranium biology.organism_classification Microbiology chemistry Earth and Planetary Sciences (miscellaneous) Environmental Chemistry Kaolinite Clay minerals General Environmental Science Nuclear chemistry Waste disposal |
| Zdroj: | Geomicrobiology Journal. 27:225-230 |
| ISSN: | 1521-0529 0149-0451 |
| DOI: | 10.1080/01490450903456715 |
| Popis: | We conducted a series of basic studies on the microbial accumulation of actinides to elucidate their migration behavior around backfill materials used in the geological disposal of radioactive wastes. We explored the interactions of U(VI) and Pu(VI) with Bacillus subtilis, kaolinite clay, and within a mixture of the two, directly analyzing their association with the bacterium in the mixture by transmission electron microscopy (TEM) and scanning electron microscopy (SEM). The accumulation of U by the mixture rose as the numbers of B. subtilis cells increased. Treating the kaolinite with potassium acetate (CH 3 COOK) removed approximately 80% of the associated uranium while only 65% was removed in the presence of B. subtilis. TEM-EDS analysis confirmed that most of the U taken from solution was associated with B. subtilis. XANES analyses revealed that the oxidation state of uranium associated with B. subtilis, kaolinite, and with the mixture containing both was U(VI). The amount of Pu sorbed by B. subtilis ... |
| Databáze: | OpenAIRE |
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