| Mineral: |
Goethite |
| Reference: |
SPH08 |
| SCM Type: |
1pK-BS - 1pK-Basic Stern |
| Ligand: |
UO2<2+>
- uranyl(VI)
|
| Site Type: |
»Fe-singly |
| Equation: |
»Fe-OH<0.5-> + UO2<2+> + CO3<2-> + H<1+> ⇔ (»Fe-O)-CO3UO2 |
| LogK: |
22.935 LogK°I=0 (Conversion to I = 0): 23.90
LogK2.31 nm−2 (SSD-normalized): 23.01
|
| Experiment: |
Batch Sorption Experiments |
| Ionic Strength: |
0.1 mol/L
NaNO3
|
| Temperature: |
298.15 K |
| Solid/Liquid Ratio: |
0.09 g/L |
| pH Range: |
3-10 |
| Ligand Concentration Range: |
1E-7 mol/L |
| Fit Method: |
EQLFOR |
| Comment: |
maximum surface loading 0.026 wt% U; assumption that UO2<2+> only forms complexes with the »Fe-OH<0.5-> surface sites on the {101} surface and the »Fe-O<0.5-> surface sites on {101} do not form complexes with UO2<2+>; original equation in the article: »Fe-OH<0.5-> + UO2<2+> + H2CO3 = (»Fe-O)2-CO3UO2 + H<1+> with logK = 6.24; thermodynamic data: logK1 = -6.366 for the reaction H2CO3 = H<1+> + HCO3<1->[FNK96], logK2 = -10.329 for HCO3<1-> = H<1+> + CO3<2-> [GFFGN03] --> so for H2CO3 = 2H<1+> + CO3<2-> the logK = -16.695; original reaction equation apparently wrong |
| |
