Please use this identifier to cite or link to this item: http://hdl.handle.net/1893/17772
Appears in Collections:Biological and Environmental Sciences Journal Articles
Peer Review Status: Refereed
Title: Fate of Cd during microbial Fe(III) mineral reduction by a novel and Cd-tolerant Geobacter species
Authors: Muehe, Eva Marie
Obst, Martin
Hitchcock, Adam
Tyliszczak, Tolek
Behrens, Sebastian
Schröder, Christian
Byrne, James M
Michel, F Marc
Kramer, Ute
Kappler, Andreas
Contact Email: christian.schroeder@stir.ac.uk
Issue Date: Dec-2013
Publisher: American Chemical Society
Citation: Muehe EM, Obst M, Hitchcock A, Tyliszczak T, Behrens S, Schröder C, Byrne JM, Michel FM, Kramer U & Kappler A (2013) Fate of Cd during microbial Fe(III) mineral reduction by a novel and Cd-tolerant Geobacter species, Environmental Science and Technology, 47 (24), pp. 14099-14109.
Abstract: Fe(III) (oxyhydr)oxides affect the mobility of contaminants in the environment by providing reactive surfaces for sorption. This includes the toxic metal cadmium (Cd), which prevails in agricultural soils and is taken up by crops. Fe(III)-reducing bacteria can mobilize such contaminants by Fe(III) mineral dissolution or immobilize them by sorption to or co-precipitation with secondary Fe minerals. To date, not much is known about the fate of Fe(III) mineral-associated Cd during microbial Fe(III) reduction. Here, we describe the isolation of a new Geobacter sp. strain Cd1 from a Cd-contaminated field site, where the strain accounts for 104 cells g -1 dry soil. Strain Cd1 reduces the poorly-crystalline Fe(III) oxyhydroxide ferrihydrite in the presence of at least up to 112 mg Cd L-1. During initial microbial reduction of Cd-loaded ferrihydrite, sorbed Cd was mobilized. However, during continuous microbial Fe(III) reduction, Cd was immobilized by sorption to and/or co-precipitation within newly formed secondary minerals that contained Ca, Fe and carbonate, implying the formation of an otavite-siderite-calcite (CdCO3-FeCO3-CaCO3) mixed mineral phase. Our data shows that microbially mediated turnover of Fe minerals affects the mobility of Cd in soils, potentially altering the dynamics of Cd uptake into food or phyto-remediating plants.
Type: Journal Article
URI: http://hdl.handle.net/1893/17772
URL: http://pubs.acs.org/doi/abs/10.1021/es403365w
DOI Link: http://dx.doi.org/10.1021/es403365w
Rights: The publisher does not allow this work to be made publicly available in this Repository. Please use the Request a Copy feature at the foot of the Repository record to request a copy directly from the author. You can only request a copy if you wish to use this work for your own research or private study.
Affiliation: University of Tuebingen (Eberhard Karls)
University of Tuebingen (Eberhard Karls)
McMaster University
Lawrence Berkeley National Laboratory
University of Tuebingen (Eberhard Karls)
Biological and Environmental Sciences
University of Tuebingen (Eberhard Karls)
Virginia Polytechnic Institute And State University
Ruhr-University of Bochum, Germany
University of Tuebingen (Eberhard Karls)

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