| Mineral: |
Ferrihydrite |
| Reference: |
GASM91 |
| SCM Type: |
TL - Triple Layer
(C1: 1.25 F/m2, C2: 0.2 F/m2) |
| Ionic Strength: |
0.0 mol/L of
NaNO3
|
| Site Type: |
»Fe-OH |
| PZC: |
8.0 |
| pK1: |
5.4 |
pK1°I=0 (Conversion to I = 0): |
5.40 |
pK12.31 nm−2 (normalized): |
5.83 |
| pK2: |
10.4 |
pK2°I=0 (Conversion to I = 0): |
10.40 |
pK22.31 nm−2 (normalized): |
9.97 |
| Site Density in nm-2: |
6.2138 |
| Original Site Density: |
0.00985 mol / g metal ion
|
| Solid/Liquid Ratio in g/L: |
4.45 |
| pH Range: |
4-9 |
| Temperature in K: |
293.15 |
| Method for Site Density: |
Mean of Different Sources |
| Method for Protolysis: | Potentiometric Titration |
| Fit Method: | FITEQL |
| Comment: |
1.4 g Fe/L (90mL suspension); CO2 free (N2), optimizations were repeated for several fixed values of SSA, ranging from 300 to 900 m2/g; optimum fits were obtained for 600 m2/g; all optimization runs were very sensitive to changes in delta(pKa) and insensitive to changes in C1; simultaneous optimization of 0.1, 0.01, and 0.001M titration data; raw data from [GAM84] (not cited); PZC=8.0+-0.2 |
| |
