| Mineral: |
Ferrihydrite |
| Reference: |
WDFP01 |
| SCM Type: |
DDL - Diffuse Double Layer
|
| Ionic Strength: |
0.1 mol/L of
NaNO3
|
| Site Type: |
»Fe-OH |
| PZC: |
|
| pK1: |
6.51 |
pK1°I=0 (Conversion to I = 0): |
6.40 |
pK12.31 nm−2 (normalized): |
7.14 |
| pK2: |
9.13 |
pK2°I=0 (Conversion to I = 0): |
9.02 |
pK22.31 nm−2 (normalized): |
8.50 |
| Site Density in nm-2: |
9.8641 |
| Original Site Density: |
16.38 µmol / m² surface
|
| Solid/Liquid Ratio in g/L: |
|
| pH Range: |
1-6 |
| Temperature in K: |
|
| Method for Site Density: |
Sorption Isotherms |
| Method for Protolysis: | Potentiometric Titration |
| Fit Method: |
| Comment: |
pK from [WDPWX94] based on ferrihydrite with 16.38 µmol sites/nm^2; ratio of strong and weak sites (strong sites 0.21% of weak sites, SSD total 0.875 mol/mol Fe, pH range 1 to 6 (resp.10 for sample W1); not explicit mentioned which sample W1, W2 or W7 (here assumed W2) »Fe(w)-(OH)2 and »Fe(s)-(OH)2 are implemented, because the double OH-groups are described surface complex equations with this protolysis data |
| |
