RES³T - Rossendorf Expert System for Surface and Sorption Thermodynamics

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Surface Complex Formation Data:

Mineral: Montmorillonite
Reference: MG96a
SCM Type: CC - Constant Capacitance
Ligand: PO4<3-> - phosphate
Site Type: »X-OH
Equation: »X-OH + PO4<3-> + H<1+>  ⇔  »X-PO4<2-> + H2O
LogK: 17.672        LogK°I=0 (Conversion to I = 0):   18.74         LogK2.31 nm−2 (SSD-normalized):   21.99
Experiment: Batch Sorption Experiments
Ionic Strength: 0.1 mol/L NaCl
Temperature: 295.15 K
Solid/Liquid Ratio: 2.5 g/L
pH Range: 2-10
Ligand Concentration Range: 6.7E-6 mol/L
Fit Method: FITEQL
Comment: temperature 22+-1°C; original reaction equation in the study: »X-OH + H3PO4 = »X-PO4<2-> + 2 H<1+> + H2O with logK = -4.03, formation constant in aqueous solution: PO4<3-> + 3 H<+> => H3PO4<0> logK = 21.702 [GFFGN03]
 
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