RES³T - Rossendorf Expert System for Surface and Sorption Thermodynamics

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Surface Complex Formation Data:

Mineral: Gibbsite
Reference: G86a
SCM Type: CC - Constant Capacitance
Ligand: AsO4<3-> - arsenate
Site Type: »Al-OH
Equation: »Al-OH + AsO4<3-> + 2 H<1+>  ⇔  »Al-HAsO4<1-> + H2O
LogK: 21.58        LogK°I=0 (Conversion to I = 0):   22.76         LogK2.31 nm−2 (SSD-normalized):   24.16
Experiment: Batch Sorption Experiments
Ionic Strength: 0.1 mol/L NaCl
Temperature: 293.15 K
Solid/Liquid Ratio: 2.12 g/L
pH Range: 3.5-10
Ligand Concentration Range: 2.7E-4 mol/L
Fit Method: FITEQL
Comment: experimental raw data from [HPQ71]; constant for the ternary system with PO4<3->; original reaction equation in the study: »Al-OH + H3AsO4 = »Al-HAsO4<1-> + H<1+> + H2O with logK = 0.96, formation constant in aqueous solution: H3AsO4 = AsO4<3-> + 3H<1+> with logK = -20.62 [GFFGN03]
 
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