Mineral: |
Ferrihydrite |
Reference: |
SW99 |
SCM Type: |
DDL - Diffuse Double Layer |
Ligand: |
AsO4<3->
- arsenate
|
Site Type: |
»Fe-OH |
Equation: |
»Fe-OH + AsO4<3-> + H<1+> ⇔ »Fe-AsO4<2-> + H2O |
LogK: |
21.36 LogK°I=0 (Conversion to I = 0): 21.36
LogK2.31 nm−2 (SSD-normalized): 23.35
|
Experiment: |
Batch Sorption Experiments |
Ionic Strength: |
0.0 mol/L
|
Temperature: |
298.15 K |
pH Range: |
3.5-12 |
Fit Method: |
FITEQL |
Comment: |
original equation in the article: »FeOH + H3AsO4 <=> »Fe-AsO4<2-> + 2H<1+> + H2O with logK = 0.76 (weighted average equilibrium constant (intrinsic adsorption constants at As(T)/Fe = 0.053, 0.107 and 0.214)), pKa-values for H3AsO4 were 2.24, 6.76 and 11.6 (Allison et al. 1991 see article) |
|