| Mineral: |
Goethite |
| Reference: |
NMDB05 |
| SCM Type: |
DDL - Diffuse Double Layer
|
| Ionic Strength: |
0.0 mol/L of
NaCl
|
| Site Type: |
»Fe-OH |
| PZC: |
8.0 |
| pK1: |
6.53 |
pK1°I=0 (Conversion to I = 0): |
6.53 |
pK12.31 nm−2 (normalized): |
6.42 |
| pK2: |
7.54 |
pK2°I=0 (Conversion to I = 0): |
7.54 |
pK22.31 nm−2 (normalized): |
7.65 |
| Site Density in nm-2: |
1.8000 |
| Original Site Density: |
1.8 sites / nm² surface
|
| Solid/Liquid Ratio in g/L: |
8.0 |
| pH Range: |
3-11 |
| Temperature in K: |
298.15 |
| Method for Site Density: |
Potentiometric Titration |
| Method for Protolysis: | Potentiometric Titration |
| Fit Method: | FITEQL |
| Comment: |
N2 atmosphere; experiments in 0.1N NaCl, pK extrapolated to IS=0; SSD graphically determined; saturation curves led to SSD=6.2E-5 mol/g goethite which corresponds to 1.87 sites/nm^2; PZC=8.0+-0.3, PZC of other electrolytes: 7.3+-0.5 (KNO3), 7.3+-0.7 (NaNO3), 8.3+-0.3 (KCl) |
| |
