Mineral: |
Goethite |
Reference: |
SMP20 |
SCM Type: |
TL - Triple Layer |
Ligand: |
Ra<2+>
- radium
|
Site Type: |
»Fe-OH |
Equation: |
5 »Fe-OH<0.5+> + Ra<2+> ⇔ (»Fe-O)5-Ra<0.5-> + 5 H<1+> |
LogK: |
-32.9 LogK°I=0 (Conversion to I = 0): -32.94
LogK2.31 nm−2 (SSD-normalized): -28.21
|
Experiment: |
Batch Sorption Experiments |
Ionic Strength: |
0.01 mol/L
NaCl
|
Solid/Liquid Ratio: |
0.3 g/L |
pH Range: |
2 - 11 |
Ligand Concentration Range: |
4E-12 - 4E-10 mol/L |
Fit Method: |
MINTEQ |
Comment: |
Inner-sphere pentadentate adsorption of Ra2+; the change of charge in the 0- (Δz0 = 0.5) and b- (Δzb = 1.5) planes;
original equation: 5»Fe-O<0.5-> + Ra<2+> = (»Fe-O)5-Ra<0.5+>, log K = 3.6 (»Fe-O<0.5-> + H<1+> =
»FeOH<0.5+>, log K = 7.3) |
|