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  • Title: Spectroscopic investigations of U(VI) species sorbed by the green algae Chlorella vulgaris.
    Author: Günther A, Raff J, Geipel G, Bernhard G.
    Journal: Biometals; 2008 Jun; 21(3):333-41. PubMed ID: 18060601.
    Abstract:
    The green alga Chlorella vulgaris has the ability to bind high amounts of uranium(VI) in the pH range from 3 to 6. At pH 3 up to 40% of the uranium are bound by the algal cells. The uranium removal is almost complete at pH 5 and 6 under the given experimental conditions. Scanning electron microscopy and laser-induced fluorescence spectroscopy were used to characterize uranyl species formed in the selected pH range. The micrographs show a regular distribution of U(VI) on the cell surface. Fluorescence spectroscopic investigations of formed algal uranyl complexes indicate that the binding of U(VI) to carboxyl groups plays a dominating role at pH 3, whereas a minor impact of organic phosphate compounds on the U(VI) sorption cannot be excluded. In contrast, at pH 5 and 6 the phosphate groups are mainly responsible for the removal and binding of U(VI) by formation of organic and/or inorganic uranyl phosphates.
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