| Mineral: |
Kaolinite |
| Reference: |
EPH13 |
| SCM Type: |
NE - Non-electrostatic |
| Ligand: |
UO2<2+>
- uranyl(VI)
|
| Site Type: |
»X(s)-OH |
| Equation: |
»X(s)-OH + UO2<2+> + 2 CO3<2-> + H2O ⇔ »X(s)-O-UO2(OH) + 2CO3<2-> + 2 H<1+> |
| LogK: |
0.61
|
| Experiment: |
Batch Sorption Experiments |
| Ionic Strength: |
ground water
|
| Solid/Liquid Ratio: |
2.5 g/L |
| pH Range: |
7 - 10 |
| Ligand Concentration Range: |
1E-8 mol/L |
| Fit Method: |
PHREEQC |
| Comment: |
Modeling first applied to OLSR (saline ground water); parameters and surface species of best fit from OLSR were applied to ALLMR water (fresh ground water)
UO2<2+> cation exchange was not considered because the study was at the pH range 7 to 10 and its contribution is found to be negligent by Bradbury and Baeyens (2009) in their study
Original reaction equation: »X(s)-OH + UO2(CO3)2<2-> + H2O = »X(s)-O-UO2(OH) + 2CO3<2-> + 2 H<1+>, log K = -15.4 (speciation reaction (ANDRA 2009): UO2<2+> + 2 CO3<2-> = UO2(CO3)<2->, log K = 16.61) |
| |
