RES³T - Rossendorf Expert System for Surface and Sorption Thermodynamics

Show Detailed Complexation Query Results


Surface Complex Formation Data:

Mineral: Ferrihydrite
Reference: MBK00
SCM Type: TL - Triple Layer
Ligand: AsO3<3-> - arsenite
Site Type: »Fe-OH
Equation: »Fe-OH + AsO3<3-> + K<1+> + 2 H<1+>  ⇔  »Fe-HAsO3K + H2O
LogK: 32.6        LogK°I=0 (Conversion to I = 0):   33.55         LogK2.31 nm−2 (SSD-normalized):   33.54
Experiment: Batch Sorption Experiments
Ionic Strength: 0.04 mol/L KNO3
Fit Method:
Comment: log K for background cation from [D78] assuming K+ behaves like Na+; best-fit constants determined with model simulations of the experimental data; original equation in the study: »Fe-OH + H3AsO3 + K<1+> = »Fe-HAsO3K + H2O + H<1+>, logK = -2.1; formation constant in aqueous solution: H3AsO3 = AsO3<3-> + 3H<1+> with logK = -34,7 (DA88]
 
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