RES³T - Rossendorf Expert System for Surface and Sorption Thermodynamics

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Surface Complex Formation Data:

Mineral: Ferrihydrite
Reference: G02a
SCM Type: CC - Constant Capacitance
Ligand: AsO4<3-> - arsenate
Site Type: »Fe-OH
Equation: »Fe-OH + AsO4<3-> + H<1+>  ⇔  »Fe-AsO4<2-> + H2O
LogK: 18.27        LogK°I=0 (Conversion to I = 0):   18.72         LogK2.31 nm−2 (SSD-normalized):   19.21
Experiment: Batch Sorption Experiments
Ionic Strength: 0.01 mol/L NaCl
Fit Method: FITEQL
Comment: original reaction equation in the study: »Fe-OH + H3AsO4 = »Fe-AsO4<2-> + 2 H<1+> + H2O with logK = -2.35, formation constant in aqueous solution: H3AsO4 = AsO4<3-> + 3H<1+> with logK = -20.62 [GFFGN03]
 
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