RES³T - Rossendorf Expert System for Surface and Sorption Thermodynamics

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Surface Complex Formation Data:

Mineral: Bentonite
Reference: GZJCW21
SCM Type: NE - Non-electrostatic
Ligand: Am<3+> - americium
Site Type: »Al(s)-OH
Equation: »Al(s)-OH + Am<3+> + 2 H2O  ⇔  »Al(s)-O-Am(OH)2 + 3 H<1+>
LogK: -13.5        LogK°I=0 (Conversion to I = 0):   -12.86         LogK2.31 nm−2 (SSD-normalized):   -17.95
Experiment: Batch Sorption Experiments
Ionic Strength: 0.1 mol/L NaCl
Temperature: 298.15 K
Solid/Liquid Ratio: 0.5 g/L
pH Range: 3 - 10
Ligand Concentration Range: 6E-10 mol/L
Fit Method: PHREEQC
Comment: also ion exchange modeled: 3»XNa + Am<3+> = (»X)3Am + 3Na<1+>, log K = 2.0;
log K values also used for modeling the sorption of Am<3+> on Ca-bentonites, in addition a cation exchange reaction between »XNa<1+> and Ca<2+> is included: »XNa + 0.5Ca<2+> = »XCa0.5 + Na<1+>, log K = 0.4
 
1 data sets were retrieved