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Fig 2. Dissolved Fe and sulfate (measured as total S) concentrations and visual changes over time in a low-sulfate incubation of D. vulgaris.  Incubation contained As-bearing ferrihydrite in artificial groundwater (0.8 mM sulfate, 10 mM lactate). Photos show transformation from red (oxidized) to black (reduced) Fe minerals.

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Fig 2. Dissolved Fe and sulfate (measured as total S) concentrations and visual changes over time in a low-sulfate incubation of D. vulgaris. Incubation contained As-bearing ferrihydrite in artificial groundwater (0.8 mM sulfate, 10 mM lactate). Photos show transformation from red (oxidized) to black (reduced) Fe minerals.
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Fig 2. Dissolved Fe and sulfate (measured as total S) concentrations and visual changes over time in a low-sulfate incubation of D. vulgaris. Incubation contained As-bearing ferrihydrite in artificial groundwater (0.8 mM sulfate, 10 mM lactate). Photos show transformation from red (oxidized) to black (reduced) Fe minerals.
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