RES³T - Rossendorf Expert System for Surface and Sorption Thermodynamics

Show Detailed Complexation Query Results


Surface Complex Formation Data:

Mineral: amorphous Silica
Reference: KKT12
SCM Type: DDL - Diffuse Double Layer
Ligand: UO2<2+> - uranyl(VI)
Site Type: »Si-OH
Equation: 2 »SiOH + UO2<2+> + CO3<2->  ⇔  (»SiO)2-UO2CO3<2-> + 2 H<1+>
LogK: 6.175        LogK°I=0 (Conversion to I = 0):   6.82
Experiment: Batch Sorption Experiments
Ionic Strength: 0.1 mol/L NaClO4
Temperature: 298.15 K
Solid/Liquid Ratio: 5.0 g/L
pH Range: 2-7
Ligand Concentration Range: 4.47E-06 mol/L
Fit Method: FITEQL
Comment: presence of 1E-03M carbonate; WSOS/DF = 0.67; original reaction equation given as: 2 »SiOH + UO2CO3 = (»SiO)2-UO2CO3<2-> + 2 H<1+> with logK = -3.82; log K for U(VI) carbonate from [KKT12] table1; other conversion data from: logK1 = -6.366 for the reaction H2CO3 = H<1+> + HCO3<1-> [FNK96], logK2 = -10.329 for HCO3<1-> = H<1+> + CO3<2->[GFFGN03] --> so for H2CO3 = 2H<1+> + CO3<2-> the logK = -16.695
 
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