| Mineral: |
amorphous Silica |
| Reference: |
GCSVB01 |
| SCM Type: |
CC - Constant Capacitance
(C1: 7.0 F/m2) |
| Ionic Strength: |
0.0 mol/L of
NaNO3
|
| Site Type: |
»Si-OH |
| PZC: |
|
| pK1: |
|
pK1°I=0 (Conversion to I = 0): |
|
|
| pK2: |
7.8 |
pK2°I=0 (Conversion to I = 0): |
7.80 |
pK22.31 nm−2 (normalized): |
7.80 |
| Site Density in nm-2: |
2.3000 |
| Original Site Density: |
2.3 sites / nm² surface
|
| Solid/Liquid Ratio in g/L: |
1.0 |
| pH Range: |
|
| Temperature in K: |
|
| Method for Site Density: |
Mean of Different Sources |
| Method for Protolysis: | Not Specified |
| Fit Method: | FITEQL |
| Comment: |
manuscript in [G98], but there other values (other parameters, other pK/logK), data for I = 0; given protolysis reaction: -Si(OH)2 = -SiO2H- + H+; pK was adjusted using experimentally obtained charges of the silica surface from [A70], [B576] and [C94]; [=Si(OH)2]total=0.645mM, [H2CO3]free=22.4µM, [H4SiO4]total=2mM |
| |
