Mineral: |
amorphous Silica |
Reference: |
SVV03 |
SCM Type: |
NE - Non-electrostatic |
Ligand: |
UO2<2+>
- uranyl(VI)
|
Site Type: |
»Si-OH |
Equation: |
»SiOH + UO2<2+> + 3 CO3<2-> ⇔ »Si-O-UO2(CO3)3<5-> + H<1+> |
LogK: |
15.97 LogK°I=0 (Conversion to I = 0): 16.77
|
Experiment: |
Batch Sorption Experiments |
Ionic Strength: |
0.015 mol/L
NaNO3
|
Temperature: |
301.0 K |
Solid/Liquid Ratio: |
5.0 g/L |
pH Range: |
2-9 |
Ligand Concentration Range: |
8.4E-5 M U and 0.005 M Na2CO3 mol/L |
Fit Method: |
Comment: |
fit by Newton-Raphson's multidimensional non-linear regression method, using a computer code developed by Stamberg et al.; sigma of K=2.03E1 based on reaction XO- + UO2(CO3)34- = XOUO2(CO3)35-; logK = -5.65 for the reaction »Si-OH + UO2(CO3)3<4-> = »Si-O-UO2(CO3)3<5-> + H<1+>; formation constant in aqueous solution: UO2<2+> + 3CO3<2-> = UO2(CO3)3<4-> with logK = 21.62 |
|