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 + Sr<2+> + H2O  ⇔  (»Fe-OH)2 (»Fe-O)2-SrOH<1-> + 3 H<1+>
LogK: 24.8        LogK°I=0 (Conversion to I = 0):   24.91         LogK2.31 nm−2 (SSD-normalized):   28.55
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-> + Sr<2+> + H2O = (»Fe-OH)2 (»Fe-O)2-SrOH<1-> + 2 H<1+> logK = 31.2 2. »Fe-OH = »Fe-O<1-> + H<1+> pK2 = -logK = 6.4 3. sum 4 »Fe-OH+Sr<2+>+H2O =(»Fe-OH)2 (»Fe-O)2-SrOH<1->+3 H<1+> logK= 31.2 - 6.4 = 24.8
 
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