H2S + OH- <===> HS- + H2O
H2S + CO3 2- <===> HS- + HCO3-
CO2 + OH- <===> HCO3-
HCO3- + OH- <===> CO3 2- + H2O
HS- + 1/2 O2 ===> S0 + OH-
HS- + 2 O2+OH- ===> SO42- + H+
CO3 2- + H2O ===> HCO3- + OH-
HCO3- ===> CO2 + OH-