RES³T - Rossendorf Expert System for Surface and Sorption Thermodynamics

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Surface Complex Formation Data:

Mineral: Goethite
Reference: NLS92
SCM Type: CC - Constant Capacitance
Ligand: PO4<3-> - phosphate
Site Type: »Fe-OH
Equation: »Fe-OH + PO4<3-> + 2 H<1+>  ⇔  »Fe-HPO4<1-> + H2O
LogK: 26.38 ± 0.09         LogK°I=0 (Conversion to I = 0):   27.56         LogK2.31 nm−2 (SSD-normalized):   27.32
Experiment: Potentiometric Titration
Ionic Strength: 0.1 mol/L NaNO3
Temperature: 298.2 K
Solid/Liquid Ratio: 11.0 g/L
pH Range: 3-9
Fit Method: FITEQL
Comment: error 3sigma; [PO4]tot / [=FeOH]tot=0.2, 0.4, 0.6, 0.8, and 1.2, resp; original reaction equation in the study: »Fe-OH + H2PO4<1-> = »Fe-HPO4<1-> + H2O with logK = 7.93, formation constant in aqueous solution: H2PO4<1-> = PO4<3-> + 2H<1+> logK = -18.45 [SM89] in 0.1M ionic strength
 
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