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:	2 »X(s)-OH + Eu<3+> ⇔ (»X(s)-O)2-Eu<1+> + 2 H<1+>
LogK:	1.6 LogK°_I=0 (Conversion to I = 0): 2.35
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.); bidentate complex; selectivity coefficient for cation exchange Na-Eu (I=0)=30

1 data sets were retrieved