Mineral: |
Goethite |
Reference: |
GM01 |
SCM Type: |
CC - Constant Capacitance |
Ligand: |
AsO4<3->
- arsenate
|
Site Type: |
»Fe-OH |
Equation: |
»Fe-OH + AsO4<3-> + 3 H<1+> ⇔ »Fe-AsO4H2 + H2O |
LogK: |
29.7 ± 0.14
LogK2.31 nm−2 (SSD-normalized): 30.64
|
Experiment: |
Batch Sorption Experiments |
Ionic Strength: |
0.7 mol/L
NaCl
|
Temperature: |
298.15 K |
Solid/Liquid Ratio: |
0.234 g/L |
pH Range: |
3-10 |
Ligand Concentration Range: |
8.8E-6...3.4E-5 mol/L |
Fit Method: |
FITEQL |
Comment: |
error interval corresponds to 95% confidence level; original equation in the study: »Fe-OH + H2AsO4<1-> + H<1+> = »Fe-AsO4H2 + H2O with logK = 12.76; formation constant in aqueous solution (25°C, 0.7M NaCl): H2AsO4<2-> = 2 H<1+> + AsO4<3-> logK = -16.94; not considering Na-As ion pairs |
|