RES³T - Rossendorf Expert System for Surface and Sorption Thermodynamics

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Surface Complex Formation Data:

Mineral: Ferrihydrite
Reference: FDZ06
SCM Type: TL - Triple Layer
Ligand: Ca<2+> - calcium
Site Type: »Fe-OH
Equation: 2 »Fe-OH + Ca<2+>  ⇔  (»Fe-O)2-Ca + 2 H<1+>
LogK: -10.2        LogK°I=0 (Conversion to I = 0):   -10.20         LogK2.31 nm−2 (SSD-normalized):   -6.22
Experiment: Batch Sorption Experiments
Ionic Strength: 0.0 mol/L NaNO3
Temperature: 298.15 K
pH Range: 3.5-9
Ligand Concentration Range: 1.78E-3 mol/L
Fit Method: FITEQL
Comment: gas phase air - 2% CO2: experiments in 0.004-0.5M NaNO3; 1E-3 - 1E-4 M Fe for sorption experiments; best fit one inner sphere and one outer sphere species, as also observed by [CZR91]; species cited as (=SO)2Ca<2+>
 
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