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: AsO4<3-> - arsenate
Site Type: »Fe-OH
Equation: »Fe-OH + AsO4<3-> + H<1+>  ⇔  »Fe-AsO4<2-> + H2O
LogK: 21.2        LogK°I=0 (Conversion to I = 0):   21.99         LogK2.31 nm−2 (SSD-normalized):   22.14
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 the model simulations of the experimental data; original reaction equation in the study: »Fe-OH +H3 AsO4 = »Fe-AsO4<2-> + H2O + 2H<1+> with logK = 0.6, formation constant in aqueous solution: H3AsO4 = AsO4<3-> + 3H<1+> with logK = -20.6 (DA88]
 
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