Mineral: |
Goethite |
Reference: |
MD06 |
SCM Type: |
DDL - Diffuse Double Layer |
Ligand: |
Si(OH)4<0>
- Silicic acid
|
Site Type: |
»Fe-OH |
Equation: |
»Fe-OH + Si(OH)4<0> ⇔ »Fe-SiO3<1-> + H<1+> + 2 H2O |
LogK: |
-0.83 LogK°I=0 (Conversion to I = 0): -0.83
LogK2.31 nm−2 (SSD-normalized): 0.11
|
Experiment: |
Empirical Correlation |
Ionic Strength: |
0.0 mol/L
|
Temperature: |
298.15 K |
Fit Method: |
FITEQL |
Comment: |
LFERs obtained for log K versus the pK of the second deprotonation constant to predict SC constants for similar cations for which limited or no sorption data exist; details also in [M95b]; original reaction equation in the study: »Fe-OH + SiO3<2-> + H<1+> = »Fe-SiO3<1-> + H2O with logK = 22.31; conversion done with the equations Si(OH)4(aq) = 2H<1+> + SiO2(OH)2<2->, Si(OH)4(aq) = 2H<1+> + H2O + SiO3<2-> with logK = -23.140 [GFFGN03] |
|