RES³T - Rossendorf Expert System for Surface and Sorption Thermodynamics

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Surface Complex Formation Data:

Mineral: Goethite
Reference: GM01
SCM Type: CC - Constant Capacitance
Ligand: AsO4<3-> - arsenate
Site Type: »Fe-OH
Equation: »Fe-OH + AsO4<3-> + 2 H<1+>  ⇔  »Fe-AsO4H<1-> + H2O
LogK: 25.2 ± 0.1         LogK2.31 nm−2 (SSD-normalized):   26.14
Experiment: Batch Sorption Experiments
Ionic Strength: 0.7 mol/L NaCl
Temperature: 298.15 K
Solid/Liquid Ratio: 0.234 g/L
pH Range: 3-10
Ligand Concentration Range: 8.8E-6...3.4E-5 mol/L
Fit Method: FITEQL
Comment: error interval corresponds to 95% confidence level; original equation in the study: »Fe-OH + H2AsO4<1-> = »Fe-AsO4H<1-> + H2O with logK = 8.26; formation constant in aqueous solution (25°C, 0.7M NaCl): H2AsO4<2-> = 2 H<1+> + AsO4<3-> logK = -16.94; not considering Na-As ion pairs
 
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