Equilibrium distribution of dissolved sulphur species in water at 25°C and 1 atm total pressure

The E_h-pH diagrams for the equilibrium concentrations in aqueous solution at 25°C of native sulphur and all the various sulphur-containing ions and acids from which the ions are produced have been constructed for systems having a total sulphur concentration of 0.1 molar. The composite of these diagrams indicates that elemental sulphur, H₂S, HS⁻ HSO₄⁻ and SO₄^ are the species that predominate in the environments that might be found in nature. This indication is in agreement with the composition of all sulphur-containing minerals.