Plant continued marsh

The cycle of iron solubilization will continue as long as bacteria and/or plants produce organic ligands.The cycle will stop when sulfate reduction rates are high and organic ligand production is low. At this point soluble hydrogen sulfide reacts with Fe(II) to form sulfide minerals. The iron cycle shown in Fig. 10.15 for salt marsh sediments may also occur in other marine sedimentary systems. 

The Marsh Risk pamphlet continues on page 23 with comments on losses in petrochemical plants ... 

Marsh. An intermittently wet or continually flooded area with the surface not deeply submerged. Predominantly covered with hydrophytic plants, such as sedges, cattails, and brushes. 

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