RES³T - Rossendorf Expert System for Surface and Sorption Thermodynamics

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Surface Complex Formation Data:

Mineral: Goethite
Reference: MG96b
SCM Type: CC - Constant Capacitance
Ligand: PO4<3-> - phosphate
Site Type: »Fe-(OH)2
Equation: »Fe-(OH)2 + PO4<3-> + 3 H<1+>  ⇔  »Fe-HPO4 + 2 H2O
LogK: 30.602        LogK°I=0 (Conversion to I = 0):   31.89         LogK2.31 nm−2 (SSD-normalized):   34.98
Experiment: Batch Sorption Experiments
Ionic Strength: 0.1 mol/L NaCl
Temperature: 296.15 K
Solid/Liquid Ratio: 2.5 g/L
pH Range: 2.5-11
Ligand Concentration Range: 2.66E-4 mol/L
Fit Method: FITEQL
Comment: two-site approach (monodentate and bidentate); original reaction equation in the study: »Fe-(OH)2 + H3PO4 = »Fe-HPO4 + 2 H2O with logK = 8.9, formation constant in aqueous solution: PO4<3-> + 3 H<+> => H3PO4<0> logK = 21.702 [GFFGN03]
 
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