RES³T - Rossendorf Expert System for Surface and Sorption Thermodynamics

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Surface Complex Formation Data:

Mineral: Ferrihydrite
Reference: JD08
SCM Type: DDL - Diffuse Double Layer
Ligand: AsO3<3-> - arsenite
Site Type: »Fe-OH
Equation: »Fe-OH + AsO3<3-> + 2 H<1+>  ⇔  »Fe-HAsO3<1-> + H2O
LogK: 31.94        LogK°I=0 (Conversion to I = 0):   32.49         LogK2.31 nm−2 (SSD-normalized):   33.93
Experiment: Batch Sorption Experiments
Ionic Strength: 0.013 mol/L NaCl
Solid/Liquid Ratio: 0.089 g/L
pH Range: 2 - 12
Ligand Concentration Range: 1.2E-4; 3.6E-4 mol/L
Fit Method: MINTEQ
Comment: 1mM HFO as Fe(III)(89 g HFO/mol Fe); mode of experiment: single & coadsorbate; original equation: »Fe-OH + H3AsO3 = »Fe-HAsO3<1-> + H<1+> + H2O with log K = -2.8, formation constant in aqueous solution: AsO3<3-> + 3H<1+> = H3AsO3 logK = 34.74 [DH03]
 
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