| Mineral: |
Goethite |
| Reference: |
S79 |
| SCM Type: |
CC - Constant Capacitance
|
| Ionic Strength: |
0.1 mol/L of
NaClO4
|
| Site Type: |
»Fe-OH |
| PZC: |
7.8 |
| pK1: |
6.4 |
pK1°I=0 (Conversion to I = 0): |
6.29 |
pK12.31 nm−2 (normalized): |
6.67 |
| pK2: |
9.25 |
pK2°I=0 (Conversion to I = 0): |
9.14 |
pK22.31 nm−2 (normalized): |
8.98 |
| Site Density in nm-2: |
4.3015 |
| Original Site Density: |
0.0002 mol / g solid
|
| Solid/Liquid Ratio in g/L: |
6.0 |
| pH Range: |
4-10 |
| Temperature in K: |
295.15 |
| Method for Site Density: |
Potentiometric Titration |
| Method for Protolysis: | Potentiometric Titration |
| Fit Method: | graphic extrapolation |
| Comment: |
assumption that =FeO- and =FeOH2+ not existing in parallel; SSD det. with backtitration method; SCM called \"ligand exchange model\", cited by [SS87], [SS80] and [SKS80]; with F=96485 As/mol: C (acid branch) =2.5 F/m^2 and 4.2 F/m^2, resp. |
| |
