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: PO4<3-> - phosphate
Site Type: »Al-OH
Equation: »Al-OH + PO4<3-> + 3 H<1+>  ⇔  »Al-H2PO4 + H2O
LogK: 23.622        LogK°I=0 (Conversion to I = 0):   24.91         LogK2.31 nm−2 (SSD-normalized):   26.20
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 As; 1.3E-4. 2.6E-4. 6.5E-4 M P mol/L
Fit Method: FITEQL
Comment: experimental raw data from [HPQ71]; constant for the ternary system with AsO4<3->; original reaction equation in the study: »Al-OH + H3PO4 = »Al-H2PO4 + H2O with logK = 1.92, formation constant in aqueous solution: PO4<3-> + 3H<1+> = H3PO4 logK = 21.702 [GFFGN03]
 
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