Mineral: |
amorphous Silica |
Reference: |
SVV03 |
SCM Type: |
NE - Non-electrostatic |
Ligand: |
UO2<2+>
- uranyl(VI)
|
Site Type: |
»Si-OH |
Equation: |
»SiOH + 3 UO2<2+> + 7 OH<1-> ⇔ »SiO-(UO2)3(OH)7<2-> + H<1+> |
LogK: |
65.34 LogK°I=0 (Conversion to I = 0): 66.15
|
Experiment: |
Batch Sorption Experiments |
Ionic Strength: |
0.01 mol/L
NaNO3
|
Temperature: |
301.0 K |
Solid/Liquid Ratio: |
5.0 g/L |
pH Range: |
2-9 |
Ligand Concentration Range: |
8.4E-5 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=1.07E4 based on reaction XO- + (UO2)3(OH)7- = XO(UO2)3(OH)72- (cited as 1.074 probably wrong); logK = -4.32 for the reaction »Si-OH + (UO2)3(OH)7<-> = »Si-O-(UO2)3(OH)7<2-> + H<1+>; formation constant in aqueous solution: 3UO2<2+> + 7OH<1-> = (UO2)3(OH)7<1-> with logK = 69.66 |
|