| Mineral: |
Goethite |
| Reference: |
KYFGD13 |
| SCM Type: |
ETL - Extended Triple Layer |
| Ligand: |
AsO3<3->
- arsenite
|
| Site Type: |
»Fe-OH |
| Equation: |
2 »Fe-OH + AsO3<3-> + 2 H<1+> ⇔ (»Fe-O)2-AsO<1-> + 2 H2O |
| LogK: |
43.27 LogK°I=0 (Conversion to I = 0): 43.76
LogK2.31 nm−2 (SSD-normalized): 45.14
|
| Experiment: |
Batch Sorption Experiments |
| Ionic Strength: |
0.01 mol/L
NaNO3
|
| Temperature: |
293.15 K |
| Solid/Liquid Ratio: |
1.0 g/L |
| pH Range: |
3 - 11 |
| Ligand Concentration Range: |
2.78E-4; 3.33E-4; 5.8E-4 mol/L |
| Fit Method: |
GEOSURF |
| Comment: |
referenced to the hypothetical 1.0 M standard state; inner sphere surface complex;
in table 4 experimental data and log K values referenced as [KYFGD10] but no data on arsenites were collected there - data were collected in this study (see text);
original equation: 2»Fe-OH + As(OH)3 = (»Fe-O)2-AsO<1-> + H<1+> + 2H2O with log K = 5.0, formation constant in aqueous solution: AsO3<3-> + 3H<1+> = H3AsO3 logK = 38.27 (see the SI) |
| |
