RES³T - Rossendorf Expert System for Surface and Sorption Thermodynamics

Show Detailed Complexation Query Results

Surface Complex Formation Data:

Mineral:	amorphous Silica
Reference:	SVV03
SCM Type:	NE - Non-electrostatic
Ligand:	UO2<2+> - uranyl(VI)
Site Type:	»Si-OH
Equation:	»SiOH + 2 UO2<2+> + 2 OH<1-> ⇔ »SiO-(UO2)2(OH)2<1+> + H<1+>
LogK:	16.39 LogK°_I=0 (Conversion to I = 0): 16.79
Experiment:	Batch Sorption Experiments
Ionic Strength:	0.01 mol/L NaNO3
Temperature:	301.0 K
Solid/Liquid Ratio:	5.0 g/L
pH Range:	2-9
Ligand Concentration Range:	8.4E-5 mol/L
Fit Method:
Comment:	fit by Newton-Raphson's multidimensional non-linear regression method, using a computer code developed by Stamberg et al.; sigma of K=5.15E6 based on reaction XO- + (UO2)2(OH)22+ = XO(UO2)2(OH)2+; value of logK eliminated from modeling; logK = -5.97 for the reaction »Si-OH + (UO2)2(OH)2<2+> = »Si-O-(UO2)2(OH)2<+> + H<1+>; formation constant in aqueous solution: 2UO2<2+> + 2OH<1-> = (UO2)2(OH)2<2+> with logK = 22.36

1 data sets were retrieved