| Mineral: |
Hematite |
| Reference: |
KHL99 |
| SCM Type: |
TL - Triple Layer
(C1: 1.6 F/m2, C2: 0.2 F/m2) |
| Ionic Strength: |
0.0 mol/L of
NaClO4
|
| Site Type: |
»Fe-OH |
| PZC: |
9.4 |
| pK1: |
8.4 |
pK1°I=0 (Conversion to I = 0): |
8.40 |
pK12.31 nm−2 (normalized): |
8.31 |
| pK2: |
10.4 |
pK2°I=0 (Conversion to I = 0): |
10.40 |
pK22.31 nm−2 (normalized): |
10.49 |
| Site Density in nm-2: |
1.8600 |
| Original Site Density: |
1.86 sites / nm² surface
|
| Solid/Liquid Ratio in g/L: |
15.6 |
| pH Range: |
5.5-11 |
| Temperature in K: |
293.15 |
| Method for Site Density: |
Potentiometric Titration |
| Method for Protolysis: | Potentiometric Titration |
| Fit Method: | FITEQL |
| Comment: |
I = 0.01, 0.1 and 0.27 M; variations in delta(pKa) from 1 to 4 had very little effect on the total site concentration -> a value of delta(pKa) = 2 was chosen according to [VRL94]; Ar atmosphere; PZC=9.4+-0.1; pK symmetrical to PZC, pK derived from delta pK=2; good fit for lowest ionic strength |
| |
