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Magnetic susceptibility as a proxy for investigating microbially mediated iron reduction

Abstract : We investigated magnetic susceptibility (MS) variations in hydrocarbon contaminated sediments. Our objective was to determine if MS can be used as an intrinsic bioremediation indicator due to the activity of iron-reducing bacteria. A contaminated and an uncontaminated core were retrieved from a site contaminated with crude oil near Bemidji, Minnesota and subsampled for MS measurements. The contaminated core revealed enriched MS zones within the hydrocarbon smear zone, which is related to iron-reduction coupled to oxidation of hydrocarbon compounds and the vadose zone, which is coincident with a zone of methane depletion suggesting aerobic or anaerobic oxidation of methane is coupled to iron-reduction. The latter has significant implications for methane cycling. We conclude that MS can serve as a proxy for intrinsic bioremediation due to the activity of iron-reducing bacteria iron-reducing bacteria and for the application of geophysics to iron cycling studies.
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Submitted on : Wednesday, March 21, 2012 - 11:07:58 AM
Last modification on : Monday, July 20, 2020 - 11:00:03 AM

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Farag M. Mewafy, Estella A. Atekwana, D. Dale Werkema Jr., Lee D. Slater, Dimitrios Ntarlagiannis, et al.. Magnetic susceptibility as a proxy for investigating microbially mediated iron reduction. Geophysical Research Letters, American Geophysical Union, 2011, 38, pp.L21402. ⟨10.1029/2011GL049271⟩. ⟨insu-00681303⟩

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