RES³T - Rossendorf Expert System for Surface and Sorption Thermodynamics

Show Detailed Complexation Query Results


Surface Complex Formation Data:

Mineral: Goethite
Reference: MD06
SCM Type: DDL - Diffuse Double Layer
Ligand: Si(OH)4<0> - Silicic acid
Site Type: »Fe-OH
Equation: »Fe-OH + Si(OH)4<0>  ⇔  »Fe-SiO3<1-> + H<1+> + 2 H2O
LogK: -0.83        LogK°I=0 (Conversion to I = 0):   -0.83         LogK2.31 nm−2 (SSD-normalized):   0.11
Experiment: Empirical Correlation
Ionic Strength: 0.0 mol/L
Temperature: 298.15 K
Fit Method: FITEQL
Comment: LFERs obtained for log K versus the pK of the second deprotonation constant to predict SC constants for similar cations for which limited or no sorption data exist; details also in [M95b]; original reaction equation in the study: »Fe-OH + SiO3<2-> + H<1+> = »Fe-SiO3<1-> + H2O with logK = 22.31; conversion done with the equations Si(OH)4(aq) = 2H<1+> + SiO2(OH)2<2->, Si(OH)4(aq) = 2H<1+> + H2O + SiO3<2-> with logK = -23.140 [GFFGN03]
 
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