RES³T - Rossendorf Expert System for Surface and Sorption Thermodynamics

Show Detailed Complexation Query Results


Surface Complex Formation Data:

Mineral: Ferrihydrite
Reference: GB07
SCM Type: CDM - (CD-)MUSIC
Ligand: AsO3<3-> - arsenite
Site Type: »Fe-singly
Equation: 2 »Fe-OH<0.5-> + AsO3<3-> + 2 H<1+>  ⇔  »Fe2-O2-AsO<2-> + 2 H2O
LogK: 35.96        LogK°I=0 (Conversion to I = 0):   37.14         LogK2.31 nm−2 (SSD-normalized):   36.11
Experiment: Batch Sorption Experiments
Ionic Strength: 0.1 mol/L NaNO3
Temperature: 298.15 K
Solid/Liquid Ratio: 0.089 g/L
pH Range: 3.5 - 12
Ligand Concentration Range: 5.3E-5 mol/L
Fit Method: FITEQL
Comment: data set from [SW99] used for the optimization of As adsorption constants; original equation in the study: 2 »Fe-OH<0.5-> + H3AsO3 = »Fe2-O2-AsOH<1-> + H<1+> + 2 H2O with logK = -2.31 ± 0.018, arsenite protonation constants are from Nordstrom and Archer (2002) (AsO3<3-> + 3H<1+> = H3AsO3 with logK = 38.27)
 
1 data sets were retrieved