C CO3-2 2.0 HCO3 12.0111C(+4) CO3-2 2.0 HCO3C(-4) CH4 0 CH4Alkalinity CO3-2 1.0 Ca0.5(CO3)0.5 50.05S SO4-2 0 SO4 32.064S(6) SO4-2 0 SO4S(-2) HS- 1.0 S