RES³T - Rossendorf Expert System for Surface and Sorption Thermodynamics

Show Detailed Complexation Query Results


Surface Complex Formation Data:

Mineral: Bentonite
Reference: CJGMW14
SCM Type: DDL - Diffuse Double Layer
Ligand: PO4<3-> - phosphate
Site Type: »Al-OH
Equation: 2 »Al-OH + PO4<3-> + H2O  ⇔  (»Al)2-HPO4 + 3OH<1->
LogK: -2.75        LogK°I=0 (Conversion to I = 0):   -1.79         LogK2.31 nm−2 (SSD-normalized):   -5.96
Experiment: Batch Sorption Experiments
Ionic Strength: 0.1 mol/L NaCl
Temperature: 295.0 K
pH Range: 2-10
Ligand Concentration Range: 2E-5; 2E-4 mol/L
Fit Method: PHREEQC
Comment: Model 2; S/L ratio = 0.5, 1, 3 g/L; original equation in the article: 2»Al-OH + HPO4<2-> = (»Al)2-HPO4 + 2OH<1-> with logK = -1.1, conversion on the basis of logK values from the Nagra/PSI Chemical Thermodynamic Data Base
 
1 data sets were retrieved