RES³T - Rossendorf Expert System for Surface and Sorption Thermodynamics

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Surface Complex Formation Data:

Mineral: Montmorillonite
Reference: KBBBM21
SCM Type: NE - Non-electrostatic
Ligand: Ra<2+> - radium
Site Type: »X(w2)-OH
Equation: »X(w2)-OH + Ra<2+>  ⇔  »X(w2)-O-Ra<1+> + H<1+>
LogK: -5.0
Experiment: Batch Sorption Experiments
Ionic Strength: NaCl
Temperature: 294.15 K
pH Range: 5 - 10
Ligand Concentration Range: 2E-7; 1.9E-8; 1.8E-8 mol/L
Fit Method: MINEQL
Comment: I = 0.02, 0.14 and 0.3 M; S/L ratio: 2.21, 8.33 and 13.95; in case pH is below 8 and ionic strength is below 0.1 M, the adsorption by cation exchange (also modeled in the study) is dominant and the contribution by surface complexation becomes negligible
 
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