RES³T - Rossendorf Expert System for Surface and Sorption Thermodynamics

Show Detailed Complexation Query Results


Surface Complex Formation Data:

Mineral: Kaolinite
Reference: EPH13
SCM Type: NE - Non-electrostatic
Ligand: Nb(OH)5<0> - niobium(V) hydroxyde
Site Type: »X(w)-OH
Equation: »X(w)-OH + Nb(OH)5<0> + H2O  ⇔  »X(w)-O-Nb(OH)6<2-> + 2 H<1+>
LogK: -6.96
Experiment: Batch Sorption Experiments
Ionic Strength: ground water
Temperature: 298.15 K
Solid/Liquid Ratio: 1.0 g/L
pH Range: 6 - 11
Ligand Concentration Range: 1E-8 mol/L
Fit Method: PHREEQC
Comment: Best fit from OLSR (saline ground water) was applied to other waters (Figures Nb-4-6). Since the speciation in other waters is similar and the modeling results are the same as for OLSR, the other modeling results are not presented.
Original equation in the study: »X-OH + Nb(OH)7<2-> = »X-O-Nb(OH)6<2-> + H2O with logK = 7.0, thermodynamic reactions and their equilibrium constants taken from the ThermoChimie Version 7b database
 
1 data sets were retrieved