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Table 3 Reaction formulas for the thermodynamic calculations in association with sulfate reduction

From: Authigenic carbonate precipitation at the end-Guadalupian (Middle Permian) in China: Implications for the carbon cycle in ancient anoxic oceans

Aqueous species
 CO2 (aq) + H2O = HCO3  + H+
 CO3 2− + H+ = HCO3
 CaCO3 (aq) + H+ = HCO3  + Ca2+
 CaCl+ = Cl + Ca2+
 CaCl2 (aq) = 2Cl + Ca2+
 CaHCO3 + = HCO3  + Ca2+
 CaSO4 (aq) = Ca2+ + SO4 2−
 H2 (aq) + 1/2O2 (aq) = H2O
 H2S (aq) + 2O2 (aq) = 2H+ + SO4 2−
 HCl (aq) = H+ + Cl
 HO2  + H+ = H2O + 1/2O2 (aq)
 HS + 2O2 (aq) = H+ + SO4 2−
 HSO4  = H+ + SO4 2−
 NaCO3  + H+ = HCO3  + Na+
 NaCl (aq) = Cl + Na+
 NaHCO3 (aq) = HCO3  + Na+
 NaOH (aq) + H+ = H2O + Na+
 OH + H+ = H2O
 S2− + 2O2 (aq) = SO4 2−
Solids
 C (in CH2O) + H2O + O2 (aq) = HCO3  + H+
 H2O (in CH2O) = H2O
 CaCO3 + H+ = HCO3  + Ca2+