RES³T - Rossendorf Expert System for Surface and Sorption Thermodynamics

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Surface Complex Formation Data:

Mineral: Goethite
Reference: CBRZ04
SCM Type: CC - Constant Capacitance
Ligand: UO2<2+> - uranyl(VI)
Site Type: »Fe-OH
Equation: »Fe-OH + UO2<2+> + PO4<3-> + H<1+>  ⇔  »Fe-PO4UO2 + H2O
LogK: 27.95        LogK°I=0 (Conversion to I = 0):   29.45         LogK2.31 nm−2 (SSD-normalized):   28.89
Experiment: Batch Sorption Experiments
Ionic Strength: 0.1 mol/L NaNO3
Temperature: 295.0 K
Solid/Liquid Ratio: 33.3 g/L
pH Range: 3-9
Ligand Concentration Range: 5E-6M UO2<2+>. 4E-5 - 1E-3 M PO4<3-> mol/L
Fit Method: FITEQL
Comment: total Fe concentration 3.15E-3 M; also 3.3 g/L with total Fe concentration 3.15E-4 M; original reaction equation in the study: »Fe-OH + UO2<2+> + H2PO4<-> = »Fe-UO2PO4 + H<1+> + H2O with logK = 10.60; formation constant in aqueous solution (I = 0, 25 °C): H2PO4<2-> = 2 H<1+> + PO4<3-> logK = -17.35 [NLS92]
 
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