RES³T - Rossendorf Expert System for Surface and Sorption Thermodynamics

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Surface Complex Formation Data:

Mineral: Goethite
Reference: SMP20
SCM Type: TL - Triple Layer
Ligand: Ra<2+> - radium
Site Type: »Fe-OH
Equation: 5 »Fe-OH<0.5+> + Ra<2+>  ⇔  (»Fe-O)5-Ra<0.5-> + 5 H<1+>
LogK: -32.9        LogK°I=0 (Conversion to I = 0):   -32.94         LogK2.31 nm−2 (SSD-normalized):   -28.21
Experiment: Batch Sorption Experiments
Ionic Strength: 0.01 mol/L NaCl
Solid/Liquid Ratio: 0.3 g/L
pH Range: 2 - 11
Ligand Concentration Range: 4E-12 - 4E-10 mol/L
Fit Method: MINTEQ
Comment: Inner-sphere pentadentate adsorption of Ra2+; the change of charge in the 0- (Δz0 = 0.5) and b- (Δzb = 1.5) planes;
original equation: 5»Fe-O<0.5-> + Ra<2+> = (»Fe-O)5-Ra<0.5+>, log K = 3.6 (»Fe-O<0.5-> + H<1+> = »FeOH<0.5+>, log K = 7.3)
 
1 data sets were retrieved