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Fig. 1. E_H-pH diagram showing the stability fields for hematite ( ${alpha}$ Fe₂O₃), goethite ( ${alpha}$ FeOOH), and ferrihydrite ( $~$ Fe(OH)₃) [assumed Fe(II) activity 10^–6M] (Lindsay, 1979; Schwertmann and Cornell, 2000). Also plotted is the line adopted as part of the technical standard for hydric soils (National Technical Committee for Hydric Soils, 2000).