Mineral: |
Bentonite |
Reference: |
HM10 |
SCM Type: |
DDL - Diffuse Double Layer
|
Ionic Strength: |
0.053 mol/L of
ground water
|
Site Type: |
»Al-OH |
PZC: |
|
pK1: |
7.9 |
pK1°I=0 (Conversion to I = 0): |
7.81 |
pK12.31 nm−2 (normalized): |
6.37 |
pK2: |
9.22 |
pK2°I=0 (Conversion to I = 0): |
9.13 |
pK22.31 nm−2 (normalized): |
10.75 |
Site Density in nm-2: |
0.0679 |
Original Site Density: |
0.000004 mol / g solid
|
Solid/Liquid Ratio in g/L: |
4.0 |
pH Range: |
|
Temperature in K: |
|
Method for Site Density: |
Potentiometric Titration |
Method for Protolysis: | Potentiometric Titration |
Fit Method: | PHREEQC |
Comment: |
values from [HMSGB02] but there the constant capacitance model was used; 0.053m at pH=7.4 and 0.068m at pH=8.2; bentonite MX-80 with 80-84% montmorillonite, CEC = 76meq/100mg, The capacitance was introduced in the second paper [HMBF09]; also ion exchange reaction: »XNa + H<1+> = »XH + Na<1+> with logK = 1.0±0.05 |
|