RES³T - Rossendorf Expert System for Surface and Sorption Thermodynamics

Show Detailed Complexation Query Results


Surface Complex Formation Data:

Mineral: Goethite
Reference: GLS94
SCM Type: CC - Constant Capacitance
Ligand: Pb<2+> - lead
Site Type: »Fe-OH
Equation: »Fe-OH + Pb<2+>  ⇔  »Fe-OH-Pb<2+>
LogK: 8.2 ± 0.06         LogK°I=0 (Conversion to I = 0):   8.63         LogK2.31 nm−2 (SSD-normalized):   9.14
Experiment: Potentiometric Titration
Ionic Strength: 0.1 mol/L NaNO3
Fit Method: FITEQL
Comment: The good fit, obtained by including -FeOHPb2+ in the speciation scheme, was somewhat surprising, since most SCM presume a proton release when a metal ion is adsorbed.
 
1 data sets were retrieved