RES³T - Rossendorf Expert System for Surface and Sorption Thermodynamics

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Surface Complex Formation Data:

Mineral: Hematite
Reference: VT98
SCM Type: DDL - Diffuse Double Layer
Ligand: UO2<2+> - uranyl(VI)
Site Type: »Fe(w)-OH
Equation: »Fe(w)-OH + UO2<2+> + 2 H2O  ⇔  »Fe(w)-O-UO2(OH)2<1-> + 3 H<1+>
LogK: -11.7        LogK°I=0 (Conversion to I = 0):   -11.66         LogK2.31 nm−2 (SSD-normalized):   -11.02
Experiment: Batch Sorption Experiments
Ionic Strength: 0.01 mol/L NaCl
Temperature: 299.15 K
Solid/Liquid Ratio: 1.0 g/L
pH Range: 4-10
Ligand Concentration Range: 2E-6 mol/L
Fit Method: REACT
Comment: also column experiments; temperature: 26°C, 38°C, 50°C, 76°C; binding constants at the higher temperatures were not estimated (no acidity constants available); up to 50°C slight increase in the binding of uranium at lower to neutral pH, little effect on binding at neutral and higher pH
 
1 data sets were retrieved