| Mineral: |
amorphous Silica |
| Reference: |
ML93b |
| SCM Type: |
TL - Triple Layer
(C1: 1.25 F/m2, C2: 0.2 F/m2) |
| Ionic Strength: |
0.04 mol/L of
KNO3
|
| Site Type: |
»Si-OH |
| PZC: |
2.0 |
| pK1: |
-1.5 |
pK1°I=0 (Conversion to I = 0): |
-1.58 |
pK12.31 nm−2 (normalized): |
-1.16 |
| pK2: |
5.5 |
pK2°I=0 (Conversion to I = 0): |
5.42 |
pK22.31 nm−2 (normalized): |
5.16 |
| Site Density in nm-2: |
5.0284 |
| Original Site Density: |
0.00167 mol / g solid
|
| Solid/Liquid Ratio in g/L: |
0.0 |
| pH Range: |
|
| Temperature in K: |
|
| Method for Site Density: |
Tritium Exchange |
| Method for Protolysis: | Surface Charge |
| Fit Method: | MINTEQA2 |
| Comment: |
pK were determined by fitting the calculated surface charge and diffuse-layer potential to measured values of surface charge and zeta potential; site concentration determined by deuterium exchange [ML93a] (there 1.8+-0.2 mmol/g!, 190m^2/g), C1 and C2 from [JP82]; SSD 5.0 sites/nm^2 [JP82] (consistent with 1.67mmol/g and SSA 200m^2/g) |
| |
