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 + UO2<2+> + 2 CO3<2-> ⇔ »SiO-UO2(CO3)2<3-> + H<1+>
LogK:	12.47 LogK°_I=0 (Conversion to I = 0): 13.06
Experiment:	Batch Sorption Experiments
Ionic Strength:	0.015 mol/L NaNO3
Temperature:	301.0 K
Solid/Liquid Ratio:	5.0 g/L
pH Range:	2-9
Ligand Concentration Range:	8.4E-5 M U and 0.005 M Na2CO3 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=1.79E3 based on reaction XO- + UO2(CO3)22- = XOUO2(CO3)23-; logK = -4.52 for the reaction »Si-OH + UO2(CO3)2<2-> = »SiO-UO2(CO3)2<3-> + H<1+>; formation constant in aqueous solution: UO2<2+> + 2CO3<2-> = UO2(CO3)2<2-> with logK = 16.99

1 data sets were retrieved