RES³T - Rossendorf Expert System for Surface and Sorption Thermodynamics

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Surface Complex Formation Data:

Mineral: Gibbsite
Reference: MG96b
SCM Type: CC - Constant Capacitance
Ligand: AsO4<3-> - arsenate
Site Type: »Al-(OH)2
Equation: »Al-(OH)2 + AsO4<3-> + 2 H<1+>  ⇔  »Al-AsO4<1-> + 2 H2O
LogK: 23.58        LogK°I=0 (Conversion to I = 0):   24.76         LogK2.31 nm−2 (SSD-normalized):   27.94
Experiment: Batch Sorption Experiments
Ionic Strength: 0.1 mol/L NaCl
Temperature: 296.15 K
Solid/Liquid Ratio: 2.5 g/L
pH Range: 2.5-11
Ligand Concentration Range: 2.66E-4 mol/L
Fit Method: FITEQL
Comment: two-site approach (monodentate and bidentate); original reaction equation in the study: »Al-(OH)2 + H3AsO4 = »Al-AsO4<1-> + 2 H2O + H<1+> with logK = 2.9, formation constant in aqueous solution: AsO4<3-> + 3 H<+> = H3AsO4<0> logK = 20.62 [GFFGN03]
 
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