| Mineral: |
Hematite |
| Reference: |
EABFY13 |
| SCM Type: |
DDL - Diffuse Double Layer
|
| Ionic Strength: |
0.01 mol/L of
NaCl
|
| Site Type: |
»Fe-OH |
| PZC: |
7.36 |
| pK1: |
6.01 |
pK1°I=0 (Conversion to I = 0): |
5.97 |
pK12.31 nm−2 (normalized): |
6.28 |
| pK2: |
7.92 |
pK2°I=0 (Conversion to I = 0): |
7.88 |
pK22.31 nm−2 (normalized): |
7.65 |
| Site Density in nm-2: |
4.2800 |
| Original Site Density: |
4.28 sites / nm² surface
|
| Solid/Liquid Ratio in g/L: |
10.0 |
| pH Range: |
3,5 - 10,5 |
| Temperature in K: |
308.15 |
| Method for Site Density: |
Potentiometric Titration |
| Method for Protolysis: | Empirical Correlation |
| Fit Method: | FITEQL |
| Comment: |
Surface acidity constants at 25 °C were determined from the potentiometric titration at I = 0.01 M, and are referenced to the 1.0M standard state; Constants were determined from the van’t Hoff equation, the enthalpy of proton adsorption (-32.2 kJ mol-1), and the K+ and K- values derived from the 25 °C potentiometric titration. |
| |
