Mineral: |
Goethite |
Reference: |
SMP20 |
SCM Type: |
TL - Triple Layer |
Ligand: |
Ra<2+>
- radium
|
Site Type: |
»Fe-OH |
Equation: |
»Fe-OH<0.5+> + Ra<2+> ⇔ »Fe-OH<0.5+>_Ra<2+> |
LogK: |
-3.4 LogK°I=0 (Conversion to I = 0): -3.22
LogK2.31 nm−2 (SSD-normalized): -2.46
|
Experiment: |
Batch Sorption Experiments |
Ionic Strength: |
0.01 mol/L
NaCl
|
Solid/Liquid Ratio: |
10.0 g/L |
pH Range: |
2 - 11 |
Ligand Concentration Range: |
1.2E-9 - 3.9E-8 mol/L |
Fit Method: |
MINTEQ |
Comment: |
Outer-sphere adsorption of Ra2+; the change of charge in the d-plane Δzd = 2;
original equation: »Fe-O<0.5-> + Ra<2+> = »Fe-O<-0.5>_Ra<2+>, log K = 3.9 (»Fe-O<0.5-> + H<1+> =
»FeOH<0.5+>, log K = 7.3) |
|