| Mineral: |
Calcite |
| Reference: |
LS07b |
| SCM Type: |
NE - Non-electrostatic
(C1: 15.0 F/m2) |
| Ionic Strength: |
0.0 mol/L of
|
| Site Type: |
»CO3H |
| PZC: |
|
| pK1: |
|
pK1°I=0 (Conversion to I = 0): |
|
|
| pK2: |
5.1 |
pK2°I=0 (Conversion to I = 0): |
5.10 |
pK22.31 nm−2 (normalized): |
4.77 |
| Site Density in nm-2: |
4.9501 |
| Original Site Density: |
8.22 µmol / m² surface
|
| Solid/Liquid Ratio in g/L: |
|
| pH Range: |
|
| Temperature in K: |
298.15 |
| Method for Site Density: |
Best Estimate |
| Method for Protolysis: | Literature |
| Fit Method: | FITEQL |
| Comment: |
Calcite SSD was estimated from the atomic spacing of the surface unit cell. On the {10-14} plane, which is the surface that is most commonly observed on commercially available calcite powder used in uptake experiments, the surface unit cell is 4.99Å wide and 8.10Å long. It includes two Ca and two CO3 groups per 40.42Ų. Thus, calcite has about 5E-18 sites/m² or 8.22 µmol sites/m² for a cation or an anion; Data were compiled from Zachara et al. (1991), Van Cappellen et al. (1993) and Pokrovsky et al. (1999) |
| |
| Mineral: |
Calcite |
| Reference: |
LS07b |
| SCM Type: |
NE - Non-electrostatic
(C1: 15.0 F/m2) |
| Ionic Strength: |
0.0 mol/L of
|
| Site Type: |
»Ca-OH |
| PZC: |
|
| pK1: |
11.5 |
pK1°I=0 (Conversion to I = 0): |
11.50 |
pK12.31 nm−2 (normalized): |
11.83 |
| pK2: |
12.0 |
pK2°I=0 (Conversion to I = 0): |
12.00 |
pK22.31 nm−2 (normalized): |
11.67 |
| Site Density in nm-2: |
4.9501 |
| Original Site Density: |
8.22 µmol / m² surface
|
| Solid/Liquid Ratio in g/L: |
|
| pH Range: |
|
| Temperature in K: |
298.15 |
| Method for Site Density: |
Best Estimate |
| Method for Protolysis: | Literature |
| Fit Method: | FITEQL |
| Comment: |
Calcite SSD was estimated from the atomic spacing of the surface unit cell. On the {10-14} plane, which is the surface that is most commonly observed on commercially available calcite powder used in uptake experiments, the surface unit cell is 4.99Å wide and 8.10Å long. It includes two Ca and two CO3 groups per 40.42Ų. Thus, calcite has about 5E-18 sites/m² or 8.22 µmol sites/m² for a cation or an anion; Data were compiled from Zachara et al. (1991), Van Cappellen et al. (1993) and Pokrovsky et al. (1999) |
| |
