The carbonic acid system and calcite solubility in aqueous Na-K-Ca-Mg-Cl-SO[sub 4] solutions from 0 to 90[degrees]C
- Texas A M Univ., College Station (United States)
CO[sub 2] solubility, and the first and second stoichiometric dissociation constants of carbonic acid (K*[sub 1] and K*[sub 2]), have been determined in aqueous solutions containing Cl and SO[sub 4] salts of Na, K, Ca, and Mg over a wide range of ionic strength from 0 to 90[degrees]C at 0.1032 MPa (1 atm) pressure. Activity coefficients for CO[sub 2(aq)], HCO[sub 3][sup [minus]], and CO[sub 3][sup 2[minus]] ions were calculated from m[sub CO[sub 2]], K*[sub 1] and K*[sub 2]. These activity coefficients were then used to derive Pitzer parameters for the interaction between these carbonate species and other ions between 0 and 90[degrees]C. The resulting Pitzer model for the carbonic acid system was verified by its ability to accurately predict experimentally determined calcite solubility in brines from 0 to 90[degrees]C. However, calcite solubility measurements in complex brines initially supersaturated with respect to calcite indicate that Na[sup +], Mg[sup 2+], and SO[sub 4][sup 2[minus]] ions are probably incorporated into calcite lattice and significantly increase calcite solubility in brines. 50 refs., 8 figs., 7 tabs.
- OSTI ID:
- 6014128
- Journal Information:
- Geochimica et Cosmochimica Acta; (United States), Journal Name: Geochimica et Cosmochimica Acta; (United States) Vol. 57:15; ISSN GCACAK; ISSN 0016-7037
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
540310* -- Environment
Aquatic-- Basic Studies-- (1990-)
ACID CARBONATES
ALKALI METAL COMPOUNDS
ALKALINE EARTH METAL COMPOUNDS
AQUEOUS SOLUTIONS
BRINES
CALCITE
CALCIUM CHLORIDES
CALCIUM COMPOUNDS
CALCIUM HALIDES
CALCIUM SULFATES
CARBON COMPOUNDS
CARBON DIOXIDE
CARBON OXIDES
CARBONATE MINERALS
CARBONATES
CARBONIC ACID
CHALCOGENIDES
CHEMICAL REACTION KINETICS
CHLORIDES
CHLORINE COMPOUNDS
DISPERSIONS
DISSOCIATION ENERGY
ENERGY
HALIDES
HALOGEN COMPOUNDS
HYDROGEN COMPOUNDS
INORGANIC ACIDS
KINETICS
MATHEMATICAL MODELS
MINERALS
MIXTURES
OXIDES
OXYGEN COMPOUNDS
POTASSIUM CHLORIDES
POTASSIUM COMPOUNDS
POTASSIUM SULFATES
REACTION KINETICS
SODIUM CHLORIDES
SODIUM COMPOUNDS
SODIUM SULFATES
SOLUBILITY
SOLUTIONS
SULFATES
SULFUR COMPOUNDS