RES³T - Rossendorf Expert System for Surface and Sorption Thermodynamics

Show Detailed Complexation Query Results


Surface Complex Formation Data:

Mineral: Goethite
Reference: GM01
SCM Type: BS - Basic Stern
Ligand: PO4<3-> - phosphate
Site Type: »Fe-OH
Equation: »Fe-OH + PO4<3-> + 3 H<1+>  ⇔  »Fe-PO4H2 + H2O
LogK: 30.96 ± 0.25         LogK2.31 nm−2 (SSD-normalized):   31.90
Experiment: Batch Sorption Experiments
Ionic Strength: 0.7 mol/L NaCl
Temperature: 298.15 K
Solid/Liquid Ratio: 0.234 g/L
pH Range: 3-10
Ligand Concentration Range: 2.3E-5 mol/L
Fit Method: FITEQL
Comment: error interval corresponds to 95% confidence level; original reaction equation in the study: »Fe-OH + H2PO4<1-> + H<1+> = »Fe-PO4H2 + H2O with logK = 12.93; formation constant in aqueous solution (25°C, 0.7M NaCl): H2PO4<2-> = 2 H<1+> + PO4<3-> logK=-18.03
 
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