RES³T - Rossendorf Expert System for Surface and Sorption Thermodynamics

Show Detailed Complexation Query Results

Surface Complex Formation Data:

Mineral:	Illite
Reference:	L01
SCM Type:	CC - Constant Capacitance
Ligand:	Al<3+> - aluminum
Site Type:	»X-OH
Equation:	»X-OH + Al<3+> + Si(OH)4<0> ⇔ »X-O-Al(OSi(OH)3)<1+> + 2 H<1+>
LogK:	-3.4 ± 0.042 LogK°_I=0 (Conversion to I = 0): -2.65 LogK_{2.31 nm⁻²} (SSD-normalized): -3.59
Experiment:	Potentiometric Titration
Ionic Strength:	0.1 mol/L NaNO3
Temperature:	298.15 K
Solid/Liquid Ratio:	10.0 g/L
pH Range:	2 - 10.5
Fit Method:	FITEQL
Comment:	LPS illite; Al<3+> + H4SiO4 = Al(OSi(OH)3)<2+> + H<1+> with pKf1 = 2.74±0.023 (Sjöberg 1998, personal communication of the author); Al<3+> + H4SiO4 + 2H2O = Al(OH)2(OSi(OH)3)<1+> + 2H<1+> with pKf2 = 9.85±0.085

1 data sets were retrieved