| Mineral: |
Anatase |
| Reference: |
JA98 |
| SCM Type: |
TL - Triple Layer |
| Ligand: |
NpO2<1+>
- neptunyl(V)
|
| Site Type: |
»Ti-OH |
| Equation: |
»Ti-OH + NpO2<1+> + H2O ⇔ »Ti-OH-NpO2(OH) + H<1+> |
| LogK: |
-1.5 LogK°I=0 (Conversion to I = 0): -1.50
LogK2.31 nm−2 (SSD-normalized): -1.16
|
| Experiment: |
Batch Sorption Experiments |
| Ionic Strength: |
0.1 mol/L
NaCl
|
| Solid/Liquid Ratio: |
10.0 g/L |
| pH Range: |
2.5-12 |
| Ligand Concentration Range: |
2.5E-5 mol/L |
| Fit Method: |
FITEQL |
| Comment: |
TiO2 is mixture of anatase and rutile (see [J99a,b]); sorption was calculated from measurements of the radioactivity of the nuclides in the phases at varying pH and IS; no difference in the results between the ionic strength nor the methods used (batch/on-line) -> indicates formation of an inner sphere complex; sorption of NpO2+ is reversible; reference logK for background electrolyte: not correct >>SOH2+ + Cl-=SOH2Cl : -1.5 for alumina[S89b]; SO- + Na+ = SONa: -1.2 [RAV94) for goethite |
| |
