RES³T - Rossendorf Expert System for Surface and Sorption Thermodynamics

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Surface Complex Formation Data:

Mineral: Hematite
Reference: S05
SCM Type: TL - Triple Layer
Ligand: Na<1+> - sodium
Site Type: »Fe-OH
Equation: »Fe-OH + Na<1+>  ⇔  »Fe-O-Na + H<1+>
LogK: -9.1         LogK2.31 nm−2 (SSD-normalized):   -8.16
Experiment: Literature
Ionic Strength: 1.0 mol/L
Temperature: 298.15 K
Fit Method: Unknown
Comment: calculation from literature values with standard SSA and SSD at ionic strength of 1M, log K for pHzpc 8.4-8.6 in brackets for pHzpc 9-9.5 »Fe-O<1-> + Na<1+> = »Fe-O-Na logK = 3.2 (2.6) »Fe-OH = »Fe-O<1-> + H<1+> pK2 = -logK = 12.3 sum »Fe-OH + Na<1+> = »Fe-O-Na + H<1+> logK=3.2(2.6)-12.3 = -9.1(-9.7)
 
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