| Mineral: |
Goethite |
| Reference: |
MG96b |
| SCM Type: |
CC - Constant Capacitance
(C1: 1.06 F/m2) |
| Ionic Strength: |
0.1 mol/L of
NaCl
|
| Site Type: |
»Fe-(OH)2 |
| PZC: |
9.8 |
| pK1: |
7.52 |
pK1°I=0 (Conversion to I = 0): |
7.41 |
pK12.31 nm−2 (normalized): |
7.26 |
| pK2: |
10.6 |
pK2°I=0 (Conversion to I = 0): |
10.49 |
pK22.31 nm−2 (normalized): |
10.86 |
| Site Density in nm-2: |
1.2788 |
| Original Site Density: |
0.000232 mol / L solution
|
| Solid/Liquid Ratio in g/L: |
2.5 |
| pH Range: |
2.5-10 |
| Temperature in K: |
296.15 |
| Method for Site Density: |
Literature |
| Method for Protolysis: | Potentiometric Titration |
| Fit Method: | FITEQL |
| Comment: |
C was fixed at 1.06 F/m^2 [WH80]; SSD (total)= 2.31 sites/nm^2 [DK90] = 3.84E-6 mol/m^2 = 4.32E-4 mol/L; two-site approach (monodentate and bidentate), pK for bidentate from [LE94]; bidentate: =Fe-(OH)2 + H<+> = HOFe(OH)2<+>; HOFeO<-> + H<+> = =Fe(OH)2 |
| |
