Bioaccumulation of lanthanum, uranium and thorium, and use of a model system to develop a method for the biologically-mediated removal of plutonium from solution
✍ Scribed by Ping Yong; Lynne E. Macaskie
- Publisher
- Wiley (John Wiley & Sons)
- Year
- 1998
- Tongue
- English
- Weight
- 314 KB
- Volume
- 71
- Category
- Article
- ISSN
- 0268-2575
No coin nor oath required. For personal study only.
✦ Synopsis
Removal of La3, and Th4from aqueous solution by a Citro-UO 2 2b acter sp. was dependent on phosphatase-mediated phosphate release and the residence time in a plug-Ñow reactor (PFR) containing polyacrylamide gelimmobilized cells. In a stirred tank reactor (STR) lanthanum phosphate accumulated on the biomass rapidly, in preference to uranium or thorium phosphates. Thorium removal was not a †ected by the presence of uranium but was promoted in the presence of lanthanum. Analysis of the accumulated polycrystalline material by X-ray powder di †raction (XRD) analysis and proton induced X-ray emission (PIXE) suggested the formation of a mixed crystal of lanthanum and thorium phosphate. La3, and Th4are analogues of the corresponding UO 2 2s pecies of Pu3, and Pu4. The La/U/Th model system was used to PuO 2 2ì dentify some potential problems in the bioremediation of wastes containing plutonium and to develop a method for the biologically-mediated removal of plutonium from solution, in a test solution of 239Pu "spikedÏ with a 241Pu tracer.
1998 SCI.