RES³T - Rossendorf Expert System for Surface and Sorption Thermodynamics

Show Detailed Complexation Query Results


Surface Complex Formation Data:

Mineral: Ferrihydrite
Reference: GB07
SCM Type: DDL - Diffuse Double Layer
Ligand: AsO3<3-> - arsenite
Site Type: »Fe-OH
Equation: »Fe-OH + AsO3<3-> + 2 H<1+>  ⇔  »Fe-HAsO3<1-> + H2O
LogK: 36.17        LogK°I=0 (Conversion to I = 0):   37.35         LogK2.31 nm−2 (SSD-normalized):   37.11
Ionic Strength: 0.1 mol/L NaCl
Solid/Liquid Ratio: 2.0 g/L
Ligand Concentration Range: 1E-3 mol/L
Fit Method: FITEQL
Comment: data set from [JL00] used for the optimization of As adsorption constants; original equation in the study: »Fe-OH + H3AsO3 = »Fe-HAsO3<1-> + H<1+> + H2O with logK = -2.10 ± 0.014, arsenite protonation constants are from Nordstrom and Archer (2002) (AsO3<3-> + 3H<1+> = H3AsO3 with logK = 38.27)
 
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