Mineral: |
Hematite |
Reference: |
BCEK12 |
SCM Type: |
1pK-TP - 1pK-Three-Plane |
Ligand: |
AsO3<3->
- arsenite
|
Site Type: |
»Fe-OH |
Equation: |
»Fe-OH<0.5-> + AsO3<3-> + 3 H<1+> ⇔ »Fe-O-As(OH)2<0.5-> + H2O |
LogK: |
45.52 LogK°I=0 (Conversion to I = 0): 46.06
LogK2.31 nm−2 (SSD-normalized): 46.46
|
Experiment: |
Batch Sorption Experiments |
Ionic Strength: |
0.01 mol/L
NaCl
|
Temperature: |
298.15 K |
pH Range: |
3 - 7.5 |
Ligand Concentration Range: |
3E-6 - 3E-4 mol/L |
Fit Method: |
ECOSAT + FIT |
Comment: |
S/L ratio: 0.04 - 1 g/L;
CO2 partial pressures: 0.39, 10, 100 hPa;
original equation in the study: »Fe-OH<0.5-> + H<1+> + H2AsO3<1-> = (»Fe-O)-As(OH)2<0.5-> + H2O with logK = 16.42, arsenite protonation constants are from Nordstrom and Archer (2002) (AsO3<3-> + 2H<1+> = H2AsO3<1-> with logK = 29.1) |
|