RES³T - Rossendorf Expert System for Surface and Sorption Thermodynamics

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Surface Complex Formation Data:

Mineral: Bentonite
Reference: SVSBC98
SCM Type: DDL - Diffuse Double Layer
Ligand: UO2<2+> - uranyl(VI)
Site Type: »X-OH
Equation: »X-OH + UO2<2+> + H2O  ⇔  »X-O-UO2(OH) + 2 H<1+>
LogK: -7.25        LogK°I=0 (Conversion to I = 0):   -7.04         LogK2.31 nm−2 (SSD-normalized):   -3.31
Experiment: Batch Sorption Experiments
Ionic Strength: 0.1 mol/L granitic water
Temperature: 298.0 K
Solid/Liquid Ratio: 1.98 g/L
pH Range: 4-11
Ligand Concentration Range: 6.67E-7 mol/L
Fit Method: FITEQL
Comment: recaculation of the given equation: »X-OH = »X-O<1-> + H<1+> -logK1 = pK2; »X-O<1-> + UO2<2+> +OH<1-> = »X-O-UO2OH logK4; UO2<2+>+H2O=UO2OH<1+>+H<1+> logKU1=-5.25; »X-OH+UO2<2+>+H2O=»X-O-UO2(OH)+2H<1+> logK4+logKU1-logK1
 
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