Mineral: |
Ferrihydrite |
Reference: |
GB07 |
SCM Type: |
CDM - (CD-)MUSIC |
Ligand: |
AsO3<3->
- arsenite
|
Site Type: |
»Fe-singly |
Equation: |
2 »Fe-OH<0.5-> + AsO3<3-> + 2 H<1+> ⇔ »Fe2-O2-AsO<2-> + 2 H2O |
LogK: |
35.96 LogK°I=0 (Conversion to I = 0): 37.14
LogK2.31 nm−2 (SSD-normalized): 36.11
|
Experiment: |
Batch Sorption Experiments |
Ionic Strength: |
0.1 mol/L
NaNO3
|
Temperature: |
298.15 K |
Solid/Liquid Ratio: |
0.089 g/L |
pH Range: |
3.5 - 12 |
Ligand Concentration Range: |
5.3E-5 mol/L |
Fit Method: |
FITEQL |
Comment: |
data set from [SW99] used for the optimization of As adsorption constants; original equation in the study: 2 »Fe-OH<0.5-> + H3AsO3 = »Fe2-O2-AsOH<1-> + H<1+> + 2 H2O with logK = -2.31 ± 0.018, arsenite protonation constants are from Nordstrom and Archer (2002) (AsO3<3-> + 3H<1+> = H3AsO3 with logK = 38.27) |
|