RES³T - Rossendorf Expert System for Surface and Sorption Thermodynamics

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Surface Complex Formation Data:

Mineral: amorphous Silica
Reference: GCSVB01
SCM Type: CC - Constant Capacitance
Ligand: UO2<2+> - uranyl(VI)
Site Type: »Si-OH
Equation: 2 »SiOH + UO2<2+> + CO3<2-> + H2O  ⇔  (»Si-O)2-UO2CO3<3-> + 3 H<1+>
LogK: -4.22        LogK°I=0 (Conversion to I = 0):   -4.22
Experiment: Batch Sorption Experiments
Ionic Strength: 0.0 mol/L NaNO3
Ligand Concentration Range: 1E-6 mol/L
Fit Method: FITEQL
Comment: manuscript with other parameters and log K in [G98], experimental ionic strength 0.01 M, data for I = 0; characterization of surface species by TRLFS spectroscopy, [H2CO3]free=22.4µM, [H4SiO4]total=2mM; original reaction equation in the study: 2 »Si-OH + UO2<2+> + H2CO3 + H2O = (»Si-O)2-UO2CO3<3-> + 5 H<1+> with logK = -20.9, formation constant in aqueous solution: H2CO3 = CO3<2-> + 2H<1+> logK = -16.68 [SM96a]
 
1 data sets were retrieved