Microbial Reduction of Fe(III) in the Fifthian and Muloorina illites : Contrasting extents and rates of bioreduction
- Seabaugh, Jennifer L.
- Dong, Hailiang
- Kukkadapu, Ravi K.
- Eberl, Dennis D.
- Morton, John P.
- Kim, Jinwook
DOIAbstract
Shewanella putrefaciens CN32 reduces Fe(III) within two illites which have different properties: the Fithian bulk fraction and the <0.2 μm fraction of Muloorina. The Fithian illite contained 4.6% (w/w) total Fe, 81% of which was Fe(III). It was dominated by illite with some jarosite (∼32% of the total Fe(III)) and goethite (11% of the total Fe(III)). The Muloorina illite was pure and contained 9.2% Fe, 93% of which was Fe(III). Illite suspensions were buffered at pH 7 and were inoculated with CN32 cells with lactate as the electron donor. Select treatments included anthraquinone-2,6-disulfonate (AQDS) as an electron shuttle. Bioproduction of Fe(II) was determined by ferrozine analysis. The unreduced and bioreduced solids were characterized ...
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