RES³T - Rossendorf Expert System for Surface and Sorption Thermodynamics

Show Detailed Complexation Query Results


Surface Complex Formation Data:

Mineral: Ferrihydrite
Reference: SW99
SCM Type: DDL - Diffuse Double Layer
Ligand: AsO4<3-> - arsenate
Site Type: »Fe-OH
Equation: »Fe-OH + AsO4<3->  ⇔  »Fe-OH-AsO4<3->
LogK: 29.679        LogK°I=0 (Conversion to I = 0):   29.68         LogK2.31 nm−2 (SSD-normalized):   31.67
Experiment: Batch Sorption Experiments
Ionic Strength: 0.0 mol/L
Temperature: 298.15 K
pH Range: 3.5-12
Fit Method: FITEQL
Comment: original equation in the article: »FeOH + H3AsO4 <=> »FeOH-AsO4<3-> + 3H<1+> with logK = 9.079 (weighted average equilibrium constant (intrinsic adsorption constants at As(T)/Fe = 0.053, 0.107 and 0.214)), pKa-values for H3AsO4 were 2.24, 6.76 and 11.6 (Allison et al. 1991 see article)
 
1 data sets were retrieved