Mineral: |
Montmorillonite |
Reference: |
BB99a |
SCM Type: |
NE - Non-electrostatic |
Ligand: |
Zn<2+>
- zinc
|
Site Type: |
»X(w)-OH |
Equation: |
»X(w)-OH + Zn<2+> ⇔ »X(w)-O-Zn<1+> + H<1+> |
LogK: |
-2.9 ± 0.2
LogK°I=0 (Conversion to I = 0): -2.82
|
Experiment: |
Sorption Isotherms |
Ionic Strength: |
0.0033 mol/L
Ca(NO3)2
|
Solid/Liquid Ratio: |
0.94 g/L |
pH Range: |
5.7 |
Ligand Concentration Range: |
1E-7 - 2E-3 mol/L |
Fit Method: |
MINSORB |
Comment: |
Ca-Montmorillonite; Ca(NO3)3 solution equilibrated with conditioned Ca-montmorillonite!; weak sites become significant at pH > 7 and c(Zn) > 1E-5 M; MINSORB code (2-site protolysis no electrostatics surface complexation and cation exchange model developed and incorporated into MINEQL); fixed parameters: selectivity coefficient for cation exchange Ca-Zn=1.0, logK for Zn on strong sites=1.2 |
|