RES³T - Rossendorf Expert System for Surface and Sorption Thermodynamics

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Surface Complex Formation Data:

Mineral: Ferrihydrite
Reference: DH03
SCM Type: DDL - Diffuse Double Layer
Ligand: AsO4<3-> - arsenate
Site Type: »Fe-OH
Equation: »Fe-OH + AsO4<3-> + 2 H<1+>  ⇔  »FeHAsO4<1-> + H2O
LogK: 24.43        LogK°I=0 (Conversion to I = 0):   24.43         LogK2.31 nm−2 (SSD-normalized):   25.37
Experiment: Batch Sorption Experiments
Ionic Strength: 0.0 mol/L NaClO4
Temperature: 296.15 K
Solid/Liquid Ratio: 0.03 g/L
pH Range: 3.5-10.5
Ligand Concentration Range: 1E-5 - 1E-4 mol/L
Fit Method: FITEQL
Comment: As/Fe ratio 3E-2 - 3E-1; experiments in 0.01M NaClO4; also sorption isotherm at pH=4+-0.1; temperature 23+-0.4°C
 
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