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(s)-OH
Equation: »X(s)-OH + 2 Eu<3+> + 2 H2O  ⇔  »X(s)-O-(Eu)2(OH)2<3+> + 4 H<1+>
LogK: -15.0        LogK°I=0 (Conversion to I = 0):   -13.68
Experiment: Batch Sorption Experiments
Ionic Strength: 0.066 mol/L Ca(NO3)2
Solid/Liquid Ratio: 1.0 g/L
pH Range: 3-10
Ligand Concentration Range: 9.5E-9 mol/L
Fit Method: MINSORB
Comment: Ca-montmorillonite, 2SPNE/CE model; also sorption isotherm (1E-3 - 1E-9 M Eu3+, pH6 and 1E-3 - 1E-10 M, pH6.9, resp.); additional modeling: same data are well described by considering bidentate surface complexes (=XO)2Eu+ and (=XO)2Eu(OH)2-, and cation exchange; bidentate complex; selectivity coefficient for cation exchange Ca-Eu (I=0)=13
 
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