Mineral: |
Goethite |
Reference: |
S79 |
SCM Type: |
CC - Constant Capacitance
|
Ionic Strength: |
0.1 mol/L of
NaClO4
|
Site Type: |
»Fe-OH |
PZC: |
7.8 |
pK1: |
6.4 |
pK1°I=0 (Conversion to I = 0): |
6.29 |
pK12.31 nm−2 (normalized): |
6.67 |
pK2: |
9.25 |
pK2°I=0 (Conversion to I = 0): |
9.14 |
pK22.31 nm−2 (normalized): |
8.98 |
Site Density in nm-2: |
4.3015 |
Original Site Density: |
0.0002 mol / g solid
|
Solid/Liquid Ratio in g/L: |
6.0 |
pH Range: |
4-10 |
Temperature in K: |
295.15 |
Method for Site Density: |
Potentiometric Titration |
Method for Protolysis: | Potentiometric Titration |
Fit Method: | graphic extrapolation |
Comment: |
assumption that =FeO- and =FeOH2+ not existing in parallel; SSD det. with backtitration method; SCM called \"ligand exchange model\", cited by [SS87], [SS80] and [SKS80]; with F=96485 As/mol: C (acid branch) =2.5 F/m^2 and 4.2 F/m^2, resp. |
|