Mineral: |
Ferrihydrite |
Reference: |
WDFP01 |
SCM Type: |
DDL - Diffuse Double Layer |
Ligand: |
UO2<2+>
- uranyl(VI)
|
Site Type: |
»Fe(w)-OH |
Equation: |
»Fe(w)-OH + UO2<2+> + CO3<2-> ⇔ »Fe(w)-O2-UO2CO3<2-> + 2 H<1+> |
LogK: |
-0.42 LogK°I=0 (Conversion to I = 0): 0.22
LogK2.31 nm−2 (SSD-normalized): 0.04
|
Experiment: |
Batch Sorption Experiments |
Ionic Strength: |
0.1 mol/L
NaNO3
|
Fit Method: |
FITEQL |
Comment: |
component additivity approach, constants are identical to those derived for U(VI) adsorption for ferrihydrite by [WDPWX94]; better results with generalized composite approach; original reaction equation in the study: »Fe(w)-(OH)2 + UO2<2+> + H2CO3 = »Fe(w)-O2-UO2CO3<2-> + 4 H<1+> with logK = -17.103, formation constant in aqueous solution: H2CO3 = CO3<2-> + 2H<1+> logK = 16.683 [DK01] |
|