Mineral: |
Goethite |
Reference: |
SPH08 |
SCM Type: |
1pK-BS - 1pK-Basic Stern |
Ligand: |
UO2<2+>
- uranyl(VI)
|
Site Type: |
»Fe-singly |
Equation: |
2 »Fe-OH<0.5-> + UO2<2+> + CO3<2-> ⇔ (»Fe-OH)2-UO2CO3 |
LogK: |
21.045 LogK°I=0 (Conversion to I = 0): 21.90
LogK2.31 nm−2 (SSD-normalized): 21.19
|
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: 2 »Fe-OH<0.5-> + UO2<2+> + H2CO3 = (»Fe-OH)2-UO2CO3 + 2H<1+> with logK = 4.35; 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 |
|