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-> + 3 H<1+>  ⇔  »Fe-H2-AsO4 + H2O
LogK: 32.3        LogK°I=0 (Conversion to I = 0):   32.30         LogK2.31 nm−2 (SSD-normalized):   34.29
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 <=> »Fe-H2-AsO4 + H2O with logK = 11.7 (at As(T)/Fe = 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