RES³T - Rossendorf Expert System for Surface and Sorption Thermodynamics

Show Detailed Complexation Query Results


Surface Complex Formation Data:

Mineral: Ferrihydrite
Reference: SBLVD14
SCM Type: DDL - Diffuse Double Layer
Ligand: Ca<2+> - calcium
Site Type: »Fe-OH
Equation: 4 »Fe-OH + Ca<2+>  ⇔  (»Fe-OH)2(»Fe-O)2-Ca + 2 H<1+>
LogK: -9.0        LogK°I=0 (Conversion to I = 0):   -8.79         LogK2.31 nm−2 (SSD-normalized):   8.31
Experiment: Batch Sorption Experiments
Ionic Strength: 0.1 mol/L NaClO4
Solid/Liquid Ratio: 10.0 g/L
pH Range: 4-11
Fit Method: PHREEQC
Comment: To model the effect of Ca2+ competition, complexes and equations used by Sverjensky (2006) for sorption of Ca2+ to goethite were used, although the equilibrium constants had to be adapted to obtain the best fit for ferrihydrite
 
1 data sets were retrieved