RES³T - Rossendorf Expert System for Surface and Sorption Thermodynamics

Show Detailed Complexation Query Results


Surface Complex Formation Data:

Mineral: Hematite
Reference: S05
SCM Type: TL - Triple Layer
Ligand: NH4<+> - ammonium
Site Type: »Fe-OH
Equation: »Fe-OH + NH4<+>  ⇔  »Fe-O-NH4 + H<1+>
LogK: 0.3         LogK2.31 nm−2 (SSD-normalized):   1.24
Experiment: Literature
Ionic Strength: 1.0 mol/L
Temperature: 298.15 K
Fit Method: Unknown
Comment: calculation from literature values with standard SSA and SSD at ionic strength of 1M, log K for pHzpc 8.4-8.6 in brackets for pHzpc 9-9.5 »Fe-O<1-> + NH4<1+> = »Fe-O-NH4 logK = 12.6 (12.3) »Fe-OH = »Fe-O<1-> + H<1+> pK2 = -logK = 12.3 sum »Fe-OH + NH4<1+> = »Fe-O-NH4 + H<1+> logK=12.6(12.3)-12.3 = 0.3(-0)
 
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