| Water dissociation: | 8H2O → 8H+ + 8OH– | (1) |
| Anodic reaction: | 4Fe + 2H → 4Fe2+ + 8e– | 2) |
| Cathodic reaction: | 8H+ + 8 e– → 8Hads | (3) |
| Cathodic depolarization by hydrogenase: | 8Hads → (4H2) → 8H+ + 8 e– | (4) |
| Sulfate reduction by SRB | SO42– + 8e– + 9H+ → HS– + 4H2O | (5) |
| Precipitation: | Fe2+ + H2S → FeS + 2H+ | (6) |
| Precipitation: | 3Fe2+ + 6OH– → 3Fe(OH)2 | (7) |
| Total reaction: | 4Fe + SO42– + 4H2O → FeS + 3Fe(OH)2 + 2OH– | (8) |
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