| 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: |
3.9 |
pK1°I=0 (Conversion to I = 0): |
3.86 |
pK12.31 nm−2 (normalized): |
3.56 |
| pK2: |
7.2 |
pK2°I=0 (Conversion to I = 0): |
7.16 |
pK22.31 nm−2 (normalized): |
7.54 |
| Site Density in nm-2: |
1.0555 |
| Original Site Density: |
0.000175 mol / L solution
|
| Solid/Liquid Ratio in g/L: |
1.19 |
| 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 |
| |
