—— PART 1: CO2 solubility in pure H2O and in a single-salt brine ——
Calculations of CO2 solubility in the brine systems other than CO2-NaCl-H2O are not available at this stage.
—— PART 2 (Disabled): CO2 solubility in a synthetic brine ——
0-300 oC, 1-2000 bar, and the concentration of NaCl is up to 6 mol kg-1 H2O or saturation conditions
activity of dissolved CO2 in the ternary CO2-salt-H2O system
activity of H2O(l) in the ternary CO2-salt-H2O system
activity of a selected salt species
the error correction term for CO2 solubility in a synthetic brine, this term was evaluated by the difference between calculated value and experimental CO2 solubility.
grams of salt per liter of solution
mixing rule parameter #1
mixing rule parameter #2
Setschenow coefficient of salt species, e.g. KNa+, KMixed-salt
CO2 molality in the aqueous phase, mol/kg H2O
Kelvin (absolute scale)
Rankine (absolute scale)
parts per million, one milligram of solute per kg of solution
pound-force per square inch
total dissolved solids, units can be either g/L or ppm
CO2 mole fraction of CO2 in aqueous phase
water mole fraction in the CO2-rich phase
CO2 mole fraction in the CO2-rich phase
percent of salt by weight, also parts per hundred by weight (pph)
CO2 fugacity coefficient in the CO2-rich phase
H2O fugacity coefficient in the CO2-rich phase
β (0) MX
Pitzer ion-ion interaction parameter #1
β (1) MX
Pitzer ion-ion interaction parameter #2
Pitzer triple-ion interaction parameter
1. Zhao H., Fedkin M.V., Dilmore R.M., and Lvov S.N. (2015) Carbon dioxide solubility in aqueous solutions of sodium chloride at geological conditions: Experimental results at 323.15, 373.15, and 423.15 K and 150 bar and modeling up to 573.15 K and 2000 bar, Geochimica et Cosmochimica Acta149, 165-189.
Haining Zhao developed, and programmed this CO2 solubility calculator.