RES³T - Rossendorf Expert System for Surface and Sorption Thermodynamics

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Surface Complex Formation Data:

Mineral: Goethite
Reference: GGSC98
SCM Type: CC - Constant Capacitance
Ligand: CO3<2-> - carbonate
Site Type: »Fe-OH
Equation: »Fe-O2H + CO3<2-> + 2 H<1+>  ⇔  »Fe-OHCO3 + H2O
LogK: 20.311        LogK°I=0 (Conversion to I = 0):   20.31         LogK2.31 nm−2 (SSD-normalized):   25.21
Experiment: Batch Sorption Experiments
Ionic Strength: 0.0 mol/L NaNO3
Solid/Liquid Ratio: 0.82 g/L
Fit Method: GRFIT
Comment: manuscript of the paper in [G98], experimental ionic strength 0.01M; [H2CO3]total=16.4µM, [H4SiO4]total=0.76mM; adjusting data from [VRL94] with CCM (SSA=45m^2/g, site concentration 0.173 mmol/g: here 80.5 m2/g and site concentration 0.31 mmol/g); original reaction equation in the study: »Fe-O2H + H2CO3 = »Fe-OHCO3 + H2O with logK = 3.616, 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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