| Mineral: |
Ferrihydrite |
| Reference: |
AVTC02 |
| SCM Type: |
CC - Constant Capacitance
(C1: 1.9 F/m2) |
| Ionic Strength: |
0.1 mol/L of
NaNO3
|
| Site Type: |
»Fe(s)-OH |
| PZC: |
|
| pK1: |
7.7 |
pK1°I=0 (Conversion to I = 0): |
7.59 |
pK12.31 nm−2 (normalized): |
6.12 |
| pK2: |
9.05 |
pK2°I=0 (Conversion to I = 0): |
8.94 |
pK22.31 nm−2 (normalized): |
10.63 |
| Site Density in nm-2: |
0.0610 |
| Original Site Density: |
0.0054 mol / mol metal
|
| Solid/Liquid Ratio in g/L: |
0.143 |
| pH Range: |
4-9 |
| Temperature in K: |
298.15 |
| Method for Site Density: |
Best Estimate |
| Method for Protolysis: | Potentiometric Titration |
| Fit Method: | PEST |
| Comment: |
PEST/PHREEQC-2; refit of data of [LCV99] to [DM90] database with 0.188mM weak sites and 4.71µM strong sites on 0.143 g ferrihydrite with SSA=600 m^2/g; optimized SSD: 0.21 (weak)/5.4E-3 (strong) mol/mol of ferrihydrite, resp. |
| |
