RES³T - Rossendorf Expert System for Surface and Sorption Thermodynamics

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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-> + 3 H<1+>  ⇔  »Fe-H2AsO3 + H2O
LogK: 43.76        LogK°I=0 (Conversion to I = 0):   45.04         LogK2.31 nm−2 (SSD-normalized):   44.70
Ionic Strength: 0.1 mol/L NaCl
Solid/Liquid Ratio: 2.0 g/L
pH Range: 3 - 11
Ligand Concentration Range: 5.34E-4 mol/L
Fit Method: FITEQL
Comment: data set from [RJL98] used for the optimization of As adsorption constants; original equation in the study: »Fe-OH + H3AsO3 = »Fe-H2AsO3<1-> + H2O with logK = 5.49 ± 0.008, arsenite protonation constants are from Nordstrom and Archer (2002) (AsO3<3-> + 3H<1+> = H3AsO3 with logK = 38.27)
 
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