RES³T - Rossendorf Expert System for Surface and Sorption Thermodynamics

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Surface Complex Formation Data:

Mineral: Ferrihydrite
Reference: GB07
SCM Type: CDM - (CD-)MUSIC
Ligand: AsO3<3-> - arsenite
Site Type: »Fe-singly
Equation: 2 »Fe-OH<0.5-> + AsO3<3-> + 3 H<1+>  ⇔  »Fe2-O2-AsOH<1-> + 2 H2O
LogK: 44.41        LogK°I=0 (Conversion to I = 0):   44.95         LogK2.31 nm−2 (SSD-normalized):   44.56
Ionic Strength: 0.01 mol/L NaNO3
Solid/Liquid Ratio: 0.00445 g/L
pH Range: 4 - 9
Ligand Concentration Range: 1.33E-7 mol/L
Fit Method: FITEQL
Comment: data set from [WH96] used for the optimization of As adsorption constants; original equation in the study: 2 »Fe-OH<0.5-> + H3AsO3 = »Fe2-O2-AsOH<1-> + 2 H2O with logK = 6.14 ± 0.012, arsenite protonation constants are from Nordstrom and Archer (2002) (AsO3<3-> + 3H<1+> = H3AsO3 with logK = 38.27)
 
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