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-> + 2 H<1+>  ⇔  »Fe2-O2-AsO<2-> + 2 H2O
LogK: 35.94        LogK°I=0 (Conversion to I = 0):   36.43         LogK2.31 nm−2 (SSD-normalized):   36.09
Ionic Strength: 0.01 mol/L NaNO3
Solid/Liquid Ratio: 0.00445 g/L
pH Range: 4 - 9
Ligand Concentration Range: 1.33E-6 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-AsO<2-> + H<1+> + 2 H2O with logK = -2.33 ± 0.049, arsenite protonation constants are from Nordstrom and Archer (2002) (AsO3<3-> + 3H<1+> = H3AsO3 with logK = 38.27)
 
1 data sets were retrieved