*2.2.4 Oxidation of sulfur-containing organics*

Oxidation of sulfur mineral, for example, oxidation of FeS2, will produce 2H<sup>+</sup> (2FeS2 + 7O2 + 2H2O → 2Fe2+ + 4SO4 <sup>2</sup>− + 4H+ ).

Oxidation of sulfur-containing organics will release 4H+ (2Organic-S + 3O2 + 2H2O → 2SO4 <sup>2</sup>− + 4H+ ).
