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Reduction of As(V)-bearing, insoluble, poorly crystalline Fe(III) oxide by G. sulfurreducens. (A) Formation of Fe(II) (mmol/liter) ▴ and negligible release of As (μM) ▪; (B) ESEM image of magnetite formed by the reduction of insoluble poorly crystalline Fe(III) oxide; (C) identification of magnetite by XRD.
