Uranium speciation in biofilms studied by laser fluorescence techniques |
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Authors: | Thuro Arnold Kay Großmann Nils Baumann |
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Institution: | (1) FZ Dresden-Rossendorf, Institute of Radiochemistry, P.O. Box 510119, 01314 Dresden, Germany |
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Abstract: | Biofilms may immobilize toxic heavy metals in the environment and thereby influence their migration behaviour. The mechanisms
of these processes are currently not understood, because the complexity of such biofilms creates many discrete geochemical
microenvironments which may differ from the surrounding bulk solution in their bacterial diversity, their prevailing geochemical
properties, e.g. pH and dissolved oxygen concentration, the presence of organic molecules, e.g. metabolites, and many more,
all of which may affect metal speciation. To obtain such information, which is necessary for performance assessment studies
or the development of new cost-effective strategies for cleaning waste waters, it is very important to develop new non-invasive
methods applicable to study the interactions of metals within biofilm systems. Laser fluorescence techniques have some superior
features, above all very high sensitivity for fluorescent heavy metals. An approach combining confocal laser scanning microscopy
and laser-induced fluorescence spectroscopy for study of the interactions of biofilms with uranium is presented. It was found
that coupling these techniques furnishes a promising tool for in-situ non-invasive study of fluorescent heavy metals within
biofilm systems. Information on uranium speciation and uranium redox states can be obtained. |
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