| Mineral: |
Ferrihydrite |
| Reference: |
BJB02 |
| SCM Type: |
DDL - Diffuse Double Layer |
| Ligand: |
UO2<2+>
- uranyl(VI)
|
| Site Type: |
»Fe(s)-OH |
| Equation: |
2 »Fe(s)-OH + UO2<2+> + CO3<2-> ⇔ (»Fe(s)-O)2-UO2CO3<2-> + 2 H<1+> |
| LogK: |
3.69 LogK°I=0 (Conversion to I = 0): 4.33
LogK2.31 nm−2 (SSD-normalized): 3.86
|
| Experiment: |
Batch Sorption Experiments |
| Ionic Strength: |
0.1 mol/L
NaNO3
|
| Temperature: |
295.5 K |
| Solid/Liquid Ratio: |
3.3 g/L |
| pH Range: |
2-10 |
| Ligand Concentration Range: |
3.703E-5; 3.703E-6 mol/L |
| Fit Method: |
FITEQL |
| Comment: |
pCO2 0 or 1E-3.5 atm, carbonate concentration 1E-3 or 1E-2mol/L; temperature 295.5+-0.5K; original reaction equation in the study: 2 »Fe(s)-OH + UO2<2+> + H2CO3 = (»Fe(s)-O)2-UO2CO3<2-> + 4 H<1+> with logK = -12.34, formation constant in aqueous solution: H2CO3 = CO3<2-> + 2H<1+> logK = -16.03; SSD and surface acidity constants from [WDPWX94]; S/L ratio refers to the sediment to solution proportion |
| |
