RES³T - Rossendorf Expert System for Surface and Sorption Thermodynamics

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Surface Complex Formation Data:

Mineral: Hematite
Reference: BCEK12
SCM Type: 1pK-TP - 1pK-Three-Plane
Ligand: AsO3<3-> - arsenite
Site Type: »Fe-OH
Equation: »Fe-OH<0.5-> + AsO3<3-> + 3 H<1+>  ⇔  »Fe-O-As(OH)2<0.5-> + H2O
LogK: 45.52        LogK°I=0 (Conversion to I = 0):   46.06         LogK2.31 nm−2 (SSD-normalized):   46.46
Experiment: Batch Sorption Experiments
Ionic Strength: 0.01 mol/L NaCl
Temperature: 298.15 K
pH Range: 3 - 7.5
Ligand Concentration Range: 3E-6 - 3E-4 mol/L
Fit Method: ECOSAT + FIT
Comment: S/L ratio: 0.04 - 1 g/L;
CO2 partial pressures: 0.39, 10, 100 hPa;
original equation in the study: »Fe-OH<0.5-> + H<1+> + H2AsO3<1-> = (»Fe-O)-As(OH)2<0.5-> + H2O with logK = 16.42, arsenite protonation constants are from Nordstrom and Archer (2002) (AsO3<3-> + 2H<1+> = H2AsO3<1-> with logK = 29.1)
 
1 data sets were retrieved