RES³T - Rossendorf Expert System for Surface and Sorption Thermodynamics

Show Detailed Complexation Query Results


Surface Complex Formation Data:

Mineral: Magnetite
Reference: BFMR84
SCM Type: TL - Triple Layer
Ligand: NO3<1-> - nitrate
Site Type: »Fe-OH
Equation: »Fe-OH + NO3<1-> + H<1+>  ⇔  »Fe-OH2-NO3
LogK: 5.84        LogK°I=0 (Conversion to I = 0):   5.87         LogK2.31 nm−2 (SSD-normalized):  
Experiment: Potentiometric Titration
Ionic Strength: 0.001 mol/L KNO3
Temperature: 323.15 K
Solid/Liquid Ratio: 20.0 g/L
pH Range: 4-9
Ligand Concentration Range: 0.001-0.1 mol/L
Fit Method: graphic extrapolation
Comment: defined as double layer but really triple layer calulation with Kint anion from equation 17 and pK1 for anion: »Fe-OH2<1+>+A<1->=»Fe-O-H2-A logK=1.68 »Fe-OH2<1+>=»Fe-OH+H<1+> pK1=4.15 = -logK equ. invers logK=4.15 sum equ »Fe-OH+NO3<1->+H<1+>=»Fe-OH2-NO3 logK=1.68+4.15=5.83
 
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