| Mineral: |
amorphous Silica |
| Reference: |
CSSHM16 |
| SCM Type: |
DDL - Diffuse Double Layer |
| Ligand: |
UO2<2+>
- uranyl(VI)
|
| Site Type: |
»Si-OH |
| Equation: |
2 »Si-OH + UO2<2+> + PO4<3-> ⇔ (»Si-O)2-UO2PO4<3-> + 2 H<1+> |
| LogK: |
13.8 ± 0.16
LogK°I=0 (Conversion to I = 0): 13.80
|
| Experiment: |
Batch Sorption Experiments |
| Ionic Strength: |
0.0 mol/L
NaCl
|
| Temperature: |
298.15 K |
| Solid/Liquid Ratio: |
10.0 g/L |
| pH Range: |
2-5 |
| Ligand Concentration Range: |
2e-5 mol/L |
| Fit Method: |
UCODE_2014 |
| Comment: |
The aqueous phase was separated by high speed centrifugation at 8000g for 20 min and subsequently acidified to pH < 2 prior to analysis for uranium and total phosphorus by inductively coupled plasma-mass spectrometry (ICP-MS) and inductively coupled plasma-atomic emission spectrometry (ICP-AES), respectively.
This dataset is valid in combination with the twi following reactions taken from [GCSVB01]:
2 ≡SiOH + UO22+ ⇄ ≡(SiO)2-UO20 + 2 H+ logK° = −4.9
2 ≡SiOH + UO22+ + H2O ⇄ ≡(SiO)2-UO2(OH)− + 3 H+ logK° = −10.5 |
| |
