RES³T - Rossendorf Expert System for Surface and Sorption Thermodynamics

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Surface Complex Formation Data:

Mineral: Montmorillonite
Reference: PKZZ11
SCM Type: NE - Non-electrostatic
Ligand: Pu<4+> - plutonium(IV)
Site Type: »Al(s)-OH
Equation: »Al(s)-OH + Pu<4+> + 0.25 O2(g) + 1.5 H2O  ⇔  »Al(s)-OH-PuO2<1+> + 3 H<1+>
LogK: 8.8        LogK°I=0 (Conversion to I = 0):   9.38         LogK2.31 nm−2 (SSD-normalized):   4.57
Experiment: Batch Sorption Experiments
Ionic Strength: 0.01 mol/L NaCl
Solid/Liquid Ratio: 3.7 g/L
pH Range: 4-10
Fit Method: FIT4FD
Comment: Surface complexation constants describing Pu(IV)/Pu(V) sorption to aluminol and silanol groups were developed from the silica and gibbsite sorption experiments and applied to the montmorillonite dataset, inclusion of the Pu(IV)/Pu(V) redox couple into modelling efforts, Pu(IV)/Pu(V) redox couple based upon the reaction Pu4+ + 0.25 O2 + 1.5 H2O <=> PuO2+ + 3 H+ with logK = 3.439
 
1 data sets were retrieved