RES³T - Rossendorf Expert System for Surface and Sorption Thermodynamics

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Surface Complex Formation Data:

Mineral: Ferrihydrite
Reference: USBR08
SCM Type: NE - Non-electrostatic
Ligand: UO2<2+> - uranyl(VI)
Site Type: »X-OH
Equation: »X-OH + UO2<2+> + CO3<2->  ⇔  »X-O-UO2HCO3
LogK: 17.169        LogK°I=0 (Conversion to I = 0):   17.17         LogK2.31 nm−2 (SSD-normalized):   19.95
Ionic Strength: 0.0 mol/L NaNO3
Temperature: 298.15 K
Solid/Liquid Ratio: 1.0 g/L
pH Range: 6-11
Ligand Concentration Range: 1E-06 mol/L
Fit Method: FITEQL
Comment: non-electrostatic general composite approach; logK = 6.84 is the original U(VI) surface-reaction constant obtained from U(VI) sorption on ferrihydrite at different pHs; original reaction equation in the article: »X-OH + UO2<2+> + HCO3<1-> = »X-O-UO2HCO3 + H<1+> with logK = 6.84, thermodynamic data for the conversion of the equation taken from [GFFGN03]
 
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