RES³T - Rossendorf Expert System for Surface and Sorption Thermodynamics

Show Detailed Complexation Query Results

Surface Complex Formation Data:

Mineral:	Montmorillonite
Reference:	BB99a
SCM Type:	NE - Non-electrostatic
Ligand:	Zn<2+> - zinc
Site Type:	»X(s)-OH
Equation:	»X(s)-OH + Zn<2+> ⇔ »X(s)-O-Zn<1+> + H<1+>
LogK:	1.2 ± 0.2 LogK°_I=0 (Conversion to I = 0): 1.28
Experiment:	Batch Sorption Experiments
Ionic Strength:	0.0033 mol/L Ca(NO3)2
Solid/Liquid Ratio:	1.33 g/L
pH Range:	3-10
Fit Method:	MINSORB
Comment:	Ca-Montmorillonite; Ca(NO3)3 solution equilibrated with conditioned Ca-montmorillonite!; strong sites are dominant at c(Zn) < 1E-5 M; at c(Zn) ~ 1E-8 M sorption is occuring only on the strong sites; MINSORB code (2-site protolysis no electrostatics surface complexation and cation exchange model developed and incorporated into MINEQL); fixed parameters: Zn inventory 1E-3mol/kg, selectivity coefficient for cation exchange Ca-Zn=1.0

1 data sets were retrieved