Table I

Compilation of selected inorganic anodic and cathodic reactions potentially involved with the oxidation of pyrite.
Anodic half reactions	Cathodic half reactions

FeS₂+ 8 H₂O→Fe²⁺+ 2 SO₄² + 16 H⁺+ 14e^-	O₂+ 4e^-+ 4H⁺→2 H₂O
FeS₂+ 3 H₂O→Fe²⁺+ S₂O₃^2- + 6 H⁺+ 6e^-	Fe^{3 +}+ 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 S₄O₆^2- + 6 H⁺+ 7e^-
FeS₂+ 6 H₂O→Fe²⁺+ 2 + 12 H⁺+ 10e^-
Fe²⁺→ Fe³⁺+ 1e^-
H₂O→OH* + H⁺+ e^-

Druschel et al. Geochemical Transactions 2004 5:13 doi:10.1186/1467-4866-5-13