Mineral: |
amorphous Silica |
Reference: |
SCP21 |
SCM Type: |
TL - Triple Layer
(C1: 1.3 F/m2, C2: 0.1 F/m2) |
Ionic Strength: |
KCl
|
Site Type: |
»Si-OH |
PZC: |
|
pK1: |
-0.1 |
|
pK12.31 nm−2 (normalized): |
0.20 |
pK2: |
7.0 |
|
pK22.31 nm−2 (normalized): |
6.70 |
Site Density in nm-2: |
4.6000 |
Original Site Density: |
4.6 sites / nm² surface
|
Solid/Liquid Ratio in g/L: |
10.0 |
pH Range: |
3 - 9 |
Temperature in K: |
|
Method for Site Density: |
Potentiometric Titration |
Method for Protolysis: | Potentiometric Titration |
Fit Method: | GEOSURF |
Comment: |
0.001, 0.01, 0.1 M KCL;
pK1 parameter value for silica has no effect on the quality of the fit and has been chosen arbitrarily since the exact PZC value for this oxide is unknown;
the equilibrium constants refer to the hypothetical 1.0 M standard state |
|