RES³T - Rossendorf Expert System for Surface and Sorption Thermodynamics

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Surface Complex Formation Data:

Mineral: Goethite
Reference: G86a
SCM Type: CC - Constant Capacitance
Ligand: AsO4<3-> - arsenate
Site Type: »Fe-OH
Equation: »Fe-OH + AsO4<3-> + 2 H<1+>  ⇔  »Fe-HAsO4<1-> + H2O
LogK: 26.42        LogK°I=0 (Conversion to I = 0):   27.60         LogK2.31 nm−2 (SSD-normalized):   30.79
Experiment: Batch Sorption Experiments
Ionic Strength: 0.1 mol/L NaCl
Temperature: 293.15 K
Solid/Liquid Ratio: 3.72 g/L
pH Range: 3.5-10.5
Ligand Concentration Range: 1.07E-3 mol/L
Fit Method: FITEQL
Comment: experimental raw data from [HPQ71]; original reaction equation in the study: »Fe-OH + H3AsO4 = »Fe-HAsO4<1-> + H<1+> + H2O with logK = 5.8, formation constant in aqueous solution: AsO4<3-> + 3 H<+> = H3AsO4<0> logK = 20.62 [GFFGN03]
 
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