RES³T - Rossendorf Expert System for Surface and Sorption Thermodynamics

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Surface Complex Formation Data:

Mineral: Goethite
Reference: KYFGD10
SCM Type: ETL - Extended Triple Layer
Ligand: AsO4<3-> - arsenate
Site Type: »Fe-OH
Equation: 2 »Fe-OH + AsO4<3-> + 2 H<1+>  ⇔  (»Fe-O)2-AsO2<1-> + 2 H2O
LogK: 31.79         LogK2.31 nm−2 (SSD-normalized):   33.66
Experiment: Batch Sorption Experiments
Ionic Strength: NaNO3
Temperature: 293.15 K
Solid/Liquid Ratio: 1.0 g/L
pH Range: 3 - 11
Ligand Concentration Range: 6.4E-4; 3.01E-4; 1.82E-4 mol/L
Fit Method: GEOSURF
Comment: extended TLM; hypothetical 1.0 M standard states; original equation: 2»Fe-OH + H3AsO4 = (»Fe-O)2-AsO2<1-> + H<1+> + 2H2O with log K = 10.7, formation constant in aqueous solution: AsO4<3-> + 3H<1+> = H3AsO4 logK = 21.09 [Welch, Stollenwerk 2003]; 0.001, 0.01, 0.1 M NaNO3
 
1 data sets were retrieved