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. Author manuscript; available in PMC: 2015 Aug 11.
Published in final edited form as: Environ Sci Technol. 2009 Sep 1;43(17):6585–6591. doi: 10.1021/es900978h

Figure 1.

Figure 1

Panel A, concentrations of soluble total Fe in the influent and effluent of biological column SF1 as a function of time: Column SF1 (fed with 360 μM Fe(II), 6.67 μM As(III) and 2.5 mM nitrate): (▲) influent, (Δ) effluent; Column SF2 (fed with 360 μM Fe(II) and 6.67 μM As(III) without nitrate): (●) influent, (○) effluent; panel B, iron speciation in the influent and effluent of sand packed columns SFF1 or SF2: Fe(II) (solid bars) and Fe(III) (empty bars).