RES³T - Rossendorf Expert System for Surface and Sorption Thermodynamics

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Surface Complex Formation Data:

Mineral: Montmorillonite
Reference: BB06
SCM Type: NE - Non-electrostatic
Ligand: PaO2<1+> - protactinyl(V)
Site Type: »X-OH
Equation: »X-OH + PaO2<1+> + H2O  ⇔  »X-O-PaO2(OH)<1-> + 2 H<1+>
LogK: -5.0        LogK°I=0 (Conversion to I = 0):   -5.11         LogK2.31 nm−2 (SSD-normalized):   -0.95
Experiment: Batch Sorption Experiments
Ionic Strength: 0.1 mol/L NaClO4
Solid/Liquid Ratio: 0.65 g/L
pH Range: 2.5-10.5
Ligand Concentration Range: <1E-13 mol/L
Fit Method: MINSORB
Comment: Na-montmorillonite, MINSORB code (2-site protolysis no electrostatics surface complexation and cation exchange model developed and incorporated into MINEQL); original reaction equation in the study: »X-OH + PaOOH<2+> + H2O = »X-O-PaO2OH<1-> + 3 H<1+> with logK = -4.5; formation constant logK = 0.5 for the equation PaO(OH)<2+> = PaO2<1+> + H<1+> [BM76]
 
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