RES³T - Rossendorf Expert System for Surface and Sorption Thermodynamics

Show Detailed Complexation Query Results

Surface Complex Formation Data:

Mineral:	amorphous Silica
Reference:	CRCO08
SCM Type:	TL - Triple Layer
Ligand:	Sr<2+> - strontium
Site Type:	»Si-OH
Equation:	4 »Si-OH + Sr<2+> + H2O ⇔ (»Si-OH)2 (»Si-O)2-SrOH<1-> + 3 H<1+>
LogK:	20.0 LogK°_I=0 (Conversion to I = 0): 20.11
Experiment:	Batch Sorption Experiments
Ionic Strength:	0.1 mol/L NaCl
Temperature:	298.13 K
Solid/Liquid Ratio:	40.0 g/L
pH Range:	3-10
Ligand Concentration Range:	1E-3 - 7E-7 mol/L
Fit Method:	FITEQL
Comment:	calulated value equ. 1 according [S05] 1. 4 »Si-O<1->+Sr<2+>+H2O = (»Si-OH)2 (»Si-O)2-SrOH<1->+2 H<1+> logK = 27.0 2. »Si-OH = »Si-O<1-> + H<1+> pK2 = -logK = 7.0 3. sum 4 »Si-OH+Sr<2+>+H2O = (»Si-OH)2 (»Si-O)2-SrOH<1->+3 H<1+> logK = 27.0 - 7.0 = 20.0

1 data sets were retrieved