Date of Award
2006
Publication Type
Master Thesis
Degree Name
M.Sc.
Department
Geology
Keywords
Biogeochemistry.
Rights
info:eu-repo/semantics/openAccess
Creative Commons License
This work is licensed under a Creative Commons Attribution-NonCommercial-No Derivative Works 4.0 International License.
Abstract
Iron oxyhydroxides have strong chemical affinities for many trace metals including Pb, in aquatic systems where they often comprise several weight percent of the sediments. During diagenesis, Fe-oxyhydroxides may be reductively dissolved during anaerobic respiration. In freshwater sediments, where sulphate concentrations are low, most Fe reduction is microbially catalyzed. In this enzymatic process termed Dissimilatory Iron Reduction (DIR), Fe (III) minerals are used as terminal electron acceptors coupled to organic matter oxidation. In this study we examine the fate of Pb associated with Fe-oxyhydroxides during DIR in the presence of Shewanella putrefaciens 200R and lactate as the sole electron donor. The extent of Fe reduction, determined from the amount Fe(II) extractible from the mineral slurry by 0.5 mol L -1 HCl, was equivalent for both Pb bearing and pure Fe-oxyhydroxides. In contrast, aqueous Fe(II) concentrations in Pb-bearing Fe-oxyhydroxides reactors were significantly higher than those in reactors without Pb. (Abstract shortened by UMI.) Source: Masters Abstracts International, Volume: 45-01, page: 0252. Thesis (M.Sc.)--University of Windsor (Canada), 2006.
Recommended Citation
Sturm, Arne, "Dissimilatory iron reduction causes lead release from iron-oxyhydroxides." (2006). Electronic Theses and Dissertations. 1761.
https://scholar.uwindsor.ca/etd/1761