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Table I Compilation of selected inorganic anodic and cathodic reactions potentially involved with the oxidation of pyrite.

From: Acid mine drainage biogeochemistry at Iron Mountain, California

Anodic half reactions Cathodic half reactions
FeS2 + 8 H2O→Fe2+ + 2 SO42 + 16 H+ + 14e- O2 + 4e- + 4H+→2 H2O
FeS2 + 3 H2O→Fe2+ + S2O32- + 6 H+ + 6e- Fe3 + + 1e-→Fe2+
FeS2→Fe2+ + 1/2 + e- FeOOH + 3 H+ + e-→Fe2+ + 2 H2O
FeS2→Fe2+ + 1/4 S8 + 2e- MnO2 + 4H+ + 2e-→Mn2+ + 2 H2O
FeS2 + 3 H2O→Fe2+ + 1/2 S4O62- + 6 H+ + 7e-  
FeS2 + 6 H2O→Fe2+ + 2 + 12 H+ + 10e-  
Fe2+ → Fe3+ + 1e-  
H2O→OH* + H+ + e-