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Sulfur-mediated electron shuttling during bacterial iron reduction.

Sulfur-mediated electron shuttling during bacterial iron reduction.

Science (New York, N.Y.) (2014-05-03)

Theodore M Flynn, Edward J O'Loughlin, Bhoopesh Mishra, Thomas J DiChristina, Kenneth M Kemner

RESUMEN

Microbial reduction of ferric iron [Fe(III)] is an important biogeochemical process in anoxic aquifers. Depending on groundwater pH, dissimilatory metal-reducing bacteria can also respire alternative electron acceptors to survive, including elemental sulfur (S(0)). To understand the interplay of Fe/S cycling under alkaline conditions, we combined thermodynamic geochemical modeling with bioreactor experiments using Shewanella oneidensis MR-1. Under these conditions, S. oneidensis can enzymatically reduce S(0) but not goethite (α-FeOOH). The HS(-) produced subsequently reduces goethite abiotically. Because of the prevalence of alkaline conditions in many aquifers, Fe(III) reduction may thus proceed via S(0)-mediated electron-shuttling pathways.

MATERIALES

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Sigma-Aldrich

Iron, ≥99%, reduced, powder (fine)

Sigma-Aldrich

Sulfur, powder, 99.98% trace metals basis

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Sulfur, 99.998% trace metals basis

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Carbonyl iron, ≥97% Fe basis

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Iron, puriss. p.a., carbonyl-Iron powder, low in magnesium and manganese compounds, ≥99.5% (RT)

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Iron, powder, <10 μm, ≥99.9% trace metals basis

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Iron, foil, thickness 0.1 mm, ≥99.9% trace metals basis

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Iron, chips, 99.98% trace metals basis

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Iron, wire, diam. 1.0 mm, ≥99.9% trace metals basis

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Sulfur, flakes, ≥99.99% trace metals basis

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Iron, nanopowder, 35-45 nm particle size, 99.5% trace metals basis

Iron, foil, 100x100mm, thickness 0.25mm, hard, 99.5%

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Iron, foil, thickness 0.25 mm, ≥99.99% trace metals basis

Supelco

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Iron, wire reel, 0.5m, diameter 1.0mm, as drawn, 99.99+%

Iron, foil, 100x100mm, thickness 0.125mm, as rolled, 99.99+%

Iron, foil, 300x300mm, thickness 0.1mm, hard, 99.5%

Iron, tube, 200mm, outside diameter 8.0mm, inside diameter 5mm, wall thickness 1.5mm, annealed, 99.5%

Iron, rod, 200mm, diameter 25mm, as drawn, 98+%

Iron, rod, 100mm, diameter 100mm, as drawn, armcO« soft ingot 99.8%

Iron, foil, 100x100mm, thickness 0.5mm, hard, 99.5%

Iron, rod, 50mm, diameter 5.0mm, as drawn, 99.99+%

Iron, rod, 150mm, diameter 6.0mm, as drawn, 99.99+%

Iron, foil, 150x150mm, thickness 1.5mm, as rolled, 99.5%

Iron, foil, 100x100mm, thickness 1.0mm, as rolled, 99.5%

Iron, foil, 300x300mm, thickness 0.20mm, hard, 99.5%

Iron, rod, 100mm, diameter 2.0mm, as drawn, 99.95%

Iron, foil, 25x25mm, thickness 1.0mm, as rolled, 99.5%