RES³T - Rossendorf Expert System for Surface and Sorption Thermodynamics

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Surface Complex Formation Data:

Mineral: Kaolinite
Reference: DTDW12
SCM Type: DDL - Diffuse Double Layer
Ligand: UO2<2+> - uranyl(VI)
Site Type: »X-OH
Equation: 2 »X-OH<0.5-> + UO2<2+> + CO3<2->  ⇔  (»X-OH)2-UO2CO3<1->
LogK: 16.58        LogK°I=0 (Conversion to I = 0):   16.94         LogK2.31 nm−2 (SSD-normalized):   16.20
Ionic Strength: 0.01 mol/L NaNO3
Temperature: 298.0 K
Solid/Liquid Ratio: 5.0 g/L
pH Range: 3-8.5
Ligand Concentration Range: 1E-6 mol/L
Fit Method:
Comment: original reaction equation in the study: 2 »Si-OH<0.5-> + UO2<2+> + H2CO3 = (»Si-OH)2-UO2CO3<1-> + 2 H<1+> with logK = -0.1, formation constant in aqueous solution: H2CO3 = CO3<2-> + 2H<1+> logK = -16.68 [SM96a]
only valid in combination with other surface reactions and constants (see article)
 
1 data sets were retrieved