RES³T - Rossendorf Expert System for Surface and Sorption Thermodynamics

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Surface Complex Formation Data:

Mineral: Montmorillonite
Reference: BB02b
SCM Type: NE - Non-electrostatic
Ligand: Eu<3+> - europium(III)
Site Type: »X(w)-OH
Equation: 2 »X(w)-OH + Eu<3+>  ⇔  (»X(w)-O)2-Eu<1+> + 2 H<1+>
LogK: -2.5        LogK°I=0 (Conversion to I = 0):   -1.75
Experiment: Batch Sorption Experiments
Ionic Strength: 0.1 mol/L NaClO4
Solid/Liquid Ratio: 1.5 g/L
pH Range: 3-10.5
Ligand Concentration Range: 1.3E-7 mol/L
Fit Method: MINSORB
Comment: Na-montmorillonite, 2SPNE/CE model; additional modeling: same data are well described by considering bidentate surface complexes (=XO)2Eu+ and (=XO)2Eu(OH)2-, and cation exchange; also sorption isotherm (1E-3 - 1E-9 M Eu3+, pH6 and 1E-4 - 1E-10 M, pH7.2, resp.); selectivity coefficient for cation exchange Ca-Eu (I=0)=13
 
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