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Fig. 3. Changes in EH with time for Lillis soil suspensions with 5 mM soluble or solid-phase suspension concentrations of various chemical amendments. Sample labeled "Control" had no amendment, and the concentration for the lactate sample was 1.67 mM. Abbreviations: ferrihydrite (Fh), goethite (Gt), hematite (Hm), magnetite (Mag). Samples labeled +Fe(II)Cl2 were amended with 1 mM FeCl2 in addition to 5 mM solid-phase suspension.
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