RES³T - Rossendorf Expert System for Surface and Sorption Thermodynamics

Show Detailed Complexation Query Results


Surface Complex Formation Data:

Mineral: Hematite
Reference: LH99
SCM Type: TL - Triple Layer
Ligand: CO3<2-> - carbonate
Site Type: »Fe-OH
Equation: »Fe-OH + CO3<2-> + H<1+>  ⇔  »Fe-CO3<1-> + H2O
LogK: 13.395        LogK°I=0 (Conversion to I = 0):   13.40         LogK2.31 nm−2 (SSD-normalized):   14.33
Experiment: Electrophoretic Mobility
Ionic Strength: 0.0 mol/L NaClO4
Temperature: 298.15 K
Fit Method: FITEQL
Comment: experiments at I = 0.006, 0.05 and 0.5 M NaClO4, log K determined for I =0; 25+-0.1°C; original reaction equation in the study: »Fe-OH + H2CO3 = »Fe-CO3<1-> + H2O + H<1+> with logK = -3.3, formation constants: logK1 = -6.366 for the reaction H2CO3 = H<1+> + HCO3<1->[FNK96], logK2 = -10.329 for HCO3<1-> = H<1+> + CO3<2-> [GFFGN03] --> so for H2CO3 = 2H<1+> + CO3<2-> the logK = -16.695
 
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