| Mineral: |
Ferrihydrite |
| Reference: |
WDPWX94 |
| SCM Type: |
DDL - Diffuse Double Layer
|
| Ionic Strength: |
0.1 mol/L of
NaNO3
|
| Site Type: |
»Fe(s)-OH |
| PZC: |
|
| pK1: |
6.51 |
pK1°I=0 (Conversion to I = 0): |
6.40 |
pK12.31 nm−2 (normalized): |
4.45 |
| pK2: |
9.13 |
pK2°I=0 (Conversion to I = 0): |
9.02 |
pK22.31 nm−2 (normalized): |
11.19 |
| Site Density in nm-2: |
0.0203 |
| Original Site Density: |
0.0018 mol / mol metal
|
| Solid/Liquid Ratio in g/L: |
|
| pH Range: |
|
| Temperature in K: |
298.15 |
| Method for Site Density: |
Sorption Isotherms |
| Method for Protolysis: | Potentiometric Titration |
| Fit Method: | FITEQL |
| Comment: |
SSD and pK calculations are based on raw data from [D78] (see table 3); ratio of strong and weak sites (strong sites=0.21% of weak sites, SSD total=0.875 mol/mol Fe) based on their own U sorption experiments; extrapolation to infinite dilution gives pK1=6.62 and pK2=9.24; »Fe(w)-(OH)2 and »Fe(s)-(OH)2 are implemented, because the double OH-groups are described in [DWP01] and [DKJ01] with protolysis data from this paper |
| |
