RES³T - Rossendorf Expert System for Surface and Sorption Thermodynamics

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Surface Complex Formation Data:

Mineral: Ferrihydrite
Reference: FDZ06
SCM Type: TL - Triple Layer
Ligand: UO2<2+> - uranyl(VI)
Site Type: »Fe(w)-OH
Equation: 2 »Fe(w)-OH + UO2<2+> + CO3<2->  ⇔  (»Fe(w)-O)2-UO2CO3<2-> + 2 H<1+>
LogK: -15.6        LogK°I=0 (Conversion to I = 0):   -15.60         LogK2.31 nm−2 (SSD-normalized):   -12.14
Experiment: Batch Sorption Experiments
Ionic Strength: 0.0 mol/L NaNO3
Temperature: 298.15 K
pH Range: 3.5-9
Ligand Concentration Range: 1E-8 - 1E-4 mol/L
Fit Method: FITEQL
Comment: gas phase air - 2% CO2: experiments in 0.004-0.5M NaNO3; 1E-3 - 1E-4 M Fe for sorption experiments; U(VI) surface species form bidentate bonds that consume two surface sites in mass balance for sites but have an exponent of one site in this mass law
 
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