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Fig. 6. Soluble (i) Fe, (ii) Mn, and (iii) S concentrations in soil suspensions under different redox potential (EH) conditions in a microcosm incubation study with six soils. Data represent the cumulative results from all six soils. The vertical lines represent the approximate EH conditions at which (i) Fe and (ii) Mn become immobilized when EH further increases. To use the same scale for the y axis, values of each analyte are standardized by multiplying by a standardized factor. For Fe concentration (soil x standardized factor): Arkansas x 10, California x 1.67, Louisiana x 10, Texas x 1, China x 1.5, Indonesia x 3. For Mn concentration (soil x standardized factor): Arkansas x 1, California x 2, Louisiana x 4, Texas x 4.8, China x 2.4, Indonesia x 1. For S concentration (soil x standardized factor): Arkansas x 3.56, California x 1.33, Louisiana x 3.56, Texas x 1.78, China x 1, Indonesia x 1.
