Mineral: |
Montmorillonite |
Reference: |
IWJA05a |
SCM Type: |
ECC - Extended Constant Capacitance
(C1: 7.0 F/m2, C2: 3.0 F/m2) |
Ionic Strength: |
0.01 mol/L of
KNO3
|
Site Type: |
»X-OH |
PZC: |
|
pK1: |
5.0 |
pK1°I=0 (Conversion to I = 0): |
4.96 |
pK12.31 nm−2 (normalized): |
4.67 |
pK2: |
7.2 |
pK2°I=0 (Conversion to I = 0): |
7.16 |
pK22.31 nm−2 (normalized): |
7.53 |
Site Density in nm-2: |
1.0795 |
Original Site Density: |
0.000179 mol / L solution
|
Solid/Liquid Ratio in g/L: |
3.14 |
pH Range: |
4-9.5 |
Temperature in K: |
298.15 |
Method for Site Density: |
Potentiometric Titration |
Method for Protolysis: | Potentiometric Titration |
Fit Method: | GRFIT |
Comment: |
FITEQL/GRFIT; temperature 25+-0.5°C; initial estimates for SSD obtained from the maximum adsorption densities of the Zn sorption isotherms at pH=4.5 (for [X<->] and pH=7.5 (for [SOH] and [X<->]); final SSD obtained after optimization of the model against the titration data; [Ca<2+>]=1E-3 M; ion exchange: (=XK) + H<+> = (=XH) + K<+> logK=2.2, 2(=XK) + Ca<2+> = (=X2Ca) + K<+> logK=4.1 |
|