RES³T - Rossendorf Expert System for Surface and Sorption Thermodynamics

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Surface Complex Formation Data:

Mineral: Bentonite
Reference: FS06
SCM Type: NE - Non-electrostatic
Ligand: Sr<2+> - strontium
Site Type: »X-OH
Equation: »X-OH + Sr<2+> + CO3<2->  ⇔  »X-O-SrCO3<1-> + H<1+>
LogK: 0.59 ± 1.68         LogK°I=0 (Conversion to I = 0):   0.59         LogK2.31 nm−2 (SSD-normalized):   4.53
Experiment: Batch Sorption Experiments
Ionic Strength: 0.0 mol/L granitic water
Temperature: 298.15 K
Solid/Liquid Ratio: 6.45 g/L
pH Range: 3.5-9
Ligand Concentration Range: 1E-6 mol/L
Fit Method: STAMB-2003
Comment: m/V also 3.51g/L
original equation in the study: »XO<1-> + SrCO3 = »XOSrCO3<1-> with log K = 7.59 ± 1.68 (»XO<1-> + H<1+> = »XOH with log K = 9.81 ± 0.11; Sr<2+> + CO3<2-> = SrCO3 with log K = 2.81 (Busenberg, E.; Plummer, L. N.; Parker, V. B.: The solubility of strontianite (SrCO3) in CO2-H2O solutions between 2 and 91°C, Geochim. Cosmochim. Acta, 48, (1984), 2021-2035.))
combination of surface complexation and ion exchange model
 
1 data sets were retrieved