Magnetic susceptibility as a proxy for investigating microbially mediated iron reduction

Details Magnetic susceptibility as a proxy for investigating microbially mediated iron reduction Magnetic susceptibility as a proxy for investigating microbially mediated iron reduction

Nov 2011

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011georl..3821402m&link_type=abstract

Geophysical Research Letters, Volume 38, Issue 21, CiteID L21402

Physics

Geophysics

Biogeosciences: Biogeophysics, Biogeosciences: Bioremediation, Biogeosciences: Biomineralization, Biogeosciences: Microbe/Mineral Interactions, Exploration Geophysics: Magnetic And Electrical Methods (5109)

Scientific paper

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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