Environmental oxidation rate of manganese(II): bacterial catalysis |
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| Authors: | Steven Emerson Susan Kalhorn Lucinda Jacobs Bradley M Tebo Kenneth H Nealson Reinhardt A Rosson |
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| Institution: | School of Oceanography, University of Washington, Seattle, WA 98195 USA;Marine Biology Research Division, Scripps Institution of Oceanography, La Jolla, CA 92093 USA |
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| Abstract: | A simple mass balance for dissolved manganese(II) in waters containing low levels of oxygen in Saanich Inlet indicates that the residence time for Mn(II) removal to the solid phase is on the order of a few days. The average oxidation state of Mn in particulate material sampled from the region of Mn removal was 2.3–2.7, and electron micrographs revealed structures characteristic of bacterially formed Mn precipitates. Radiotracer experiments utilizing 54Mn(II) indicated that removal of Mn from solution in the region of active uptake was substantially blocked by a poison mixture, demonstrating that Mn(II) binding to particulates is catalyzed by bacteria in this environment. |
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