| Mineral: |
Ferrihydrite |
| Reference: |
KM89a |
| SCM Type: |
TL - Triple Layer
|
| Ionic Strength: |
0.0 mol/L of
KNO3
|
| Site Type: |
»Fe-OH |
| PZC: |
7.15 |
| pK1: |
5.4 |
pK1°I=0 (Conversion to I = 0): |
5.40 |
pK12.31 nm−2 (normalized): |
5.27 |
| pK2: |
9.2 |
pK2°I=0 (Conversion to I = 0): |
9.20 |
pK22.31 nm−2 (normalized): |
9.33 |
| Site Density in nm-2: |
1.7145 |
| Original Site Density: |
0.000728 mol / g solid
|
| Solid/Liquid Ratio in g/L: |
5.0 |
| pH Range: |
|
| Temperature in K: |
|
| Method for Site Density: |
Potentiometric Titration |
| Method for Protolysis: | Potentiometric Titration |
| Fit Method: | graphic extrapolation |
| Comment: |
SSD: adsorption of H+ or OH- from 0.1M HNO3 or 0.1M KOH after 24h equilibration [BM81]; SSD=1.71 sites/nm^2; single extrapolation to zero-charge condition for titration in 0.001M KNO3; double extrapolation to alpha=c=0: pK1=5.3, pK2=9.2 |
| |
