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 = »FeOCO3<1-> + H2O + H<+> with logK = -3.398, 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 |