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: NpO2<1+> - neptunyl(V)
Site Type: »X-OH
Equation: »X-OH + NpO2<1+>  ⇔  »X-O-NpO2 + H<1+>
LogK: -2.0         LogK2.31 nm−2 (SSD-normalized):   2.05
Experiment: Batch Sorption Experiments
Ionic Strength: NaClO4
pH Range: 2.5-10.5
Ligand Concentration Range: <1E-13 mol/L
Fit Method: MINSORB
Comment: Na-montmorillonite, 0.01 and 0.1 M NaClO4; solid concentration 0.61-3.2 (0.01M) and 1.2 (0.1M NaClO4), resp., MINSORB code (2-site protolysis no electrostatics surface complexation and cation exchange model developed and incorporated into MINEQL); selectivity coefficient for cation exchange Na-Np=1.1: Na-mont. + NpO2+ = NpO2-mont. + Na+
 
1 data sets were retrieved