RES³T - Rossendorf Expert System for Surface and Sorption Thermodynamics

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Surface Complex Formation Data:

Mineral: Goethite
Reference: CRCO08
SCM Type: TL - Triple Layer
Ligand: Sr<2+> - strontium
Site Type: »Fe-OH
Equation: 4 »Fe-OH + 2 Sr<2+>  ⇔  (»Fe-OH)2 (»Fe-O)2-(Sr)2<2+> + 2 H<1+>
LogK: 9.5        LogK°I=0 (Conversion to I = 0):   10.14         LogK2.31 nm−2 (SSD-normalized):   13.25
Experiment: Batch Sorption Experiments
Ionic Strength: 0.1 mol/L NaCl
Temperature: 298.13 K
Solid/Liquid Ratio: 40.0 g/L
pH Range: 4-10
Ligand Concentration Range: 1E-3 - 1E-6 mol/L
Fit Method: FITEQL
Comment: calulated value equ. 1 according [S05] 1. 4 »Fe-O<1-> + 2 Sr<2+>=(»Fe-OH)2 (»Fe-O)2-(Sr)2 + H<1+> logK=15.9 2. »Fe-OH = »Fe-O<1-> + H<1+> pK2 = -logK = 6.4 3. sum 4 »Fe-OH + 2 Sr<2+> = (»Fe-OH)2 (»Fe-O)2-(Sr)2<2+> + 2 H<1+> logK= 15.9 - 6.4 = 9.5
 
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