Mineral: |
Illite |
Reference: |
L01 |
SCM Type: |
CC - Constant Capacitance |
Ligand: |
Al<3+>
- aluminum
|
Site Type: |
»X-OH |
Equation: |
»X-OH + Al<3+> + Si(OH)4<0> ⇔ »X-O-Al(OSi(OH)3)<1+> + 2 H<1+> |
LogK: |
-3.31 ± 0.034
LogK°I=0 (Conversion to I = 0): -2.56
LogK2.31 nm−2 (SSD-normalized): -3.50
|
Experiment: |
Potentiometric Titration |
Ionic Strength: |
0.1 mol/L
NaNO3
|
Temperature: |
298.15 K |
Solid/Liquid Ratio: |
10.0 g/L |
pH Range: |
2 - 10.5 |
Fit Method: |
FITEQL |
Comment: |
WC illite; Al<3+> + H4SiO4 = Al(OSi(OH)3)<2+> + H<1+> with pKf1 = 2.74±0.023 (Sjöberg 1998, personal communication of the author); Al<3+> + H4SiO4 + 2H2O = Al(OH)2(OSi(OH)3)<1+> + 2H<1+> with pKf2 = 10.71±0.066 |
|