Mineral: |
amorphous Silica |
Reference: |
G98 |
SCM Type: |
CC - Constant Capacitance |
Ligand: |
UO2<2+>
- uranyl(VI)
|
Site Type: |
»Si-OH |
Equation: |
2 »SiOH + UO2<2+> + CO3<2-> + H2O ⇔ (»Si-O)2-UO2CO3<3-> + 3 H<1+> |
LogK: |
-5.46 LogK°I=0 (Conversion to I = 0): -5.46
|
Experiment: |
Batch Sorption Experiments |
Ionic Strength: |
0.0 mol/L
NaNO3
|
Ligand Concentration Range: |
1E-6 mol/L |
Fit Method: |
FITEQL |
Comment: |
manuscript with other parameters and log K later published in [GCSVB01], experimental ionic strength 0.01 M, data for I = 0; characterization of surface species by TRLFS spectroscopy, [H2CO3]free=16.4µM, [H4SiO4]total=0.9mM; original reaction equation in the study: 2 »Si-OH + UO2<2+> + H2CO3 + H2O = (»Si-O)2-UO2CO3<3-> + 5 H<1+> with logK = -22.14, formation constant in aqueous solution: H2CO3 = CO3<2-> + 2H<1+> logK = 16.68 [SM96] |
|