RES³T - Rossendorf Expert System for Surface and Sorption Thermodynamics

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Surface Complex Formation Data:

Mineral: Illite
Reference: DLHJG09
SCM Type: TL - Triple Layer
Ligand: Ca<2+> - calcium
Site Type: »X-OH
Equation: »X-OH<0.5-> + Ca<2+>  ⇔  »X-O-Ca<0.5+> + H<1+>
LogK: 3.4        LogK°I=0 (Conversion to I = 0):   3.72         LogK2.31 nm−2 (SSD-normalized):   3.21
Experiment: Batch Sorption Experiments
Ionic Strength: 0.1 mol/L NaCl
Temperature: 298.15 K
Solid/Liquid Ratio: 39.94 g/L
Ligand Concentration Range: 1E-3 mol/L
Fit Method: MINTEQ
Comment: 1 pK Triple Plane Model; SONa<0.5+> logK = -2.7, SOCl<0.5-> logK = 7.5 [GE07]; Table 2: species given as »X-O-Ca<1.5+> but no balance possible in reaction equation with »X-OH<0.5-> and Ca<2+>; also ion exchange reaction given: 2»X<1->·H<1+> + Ca<2+> = 2»X<1->·Ca<2+> + 2H<1+> with logK = 0.62
 
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