RES³T - Rossendorf Expert System for Surface and Sorption Thermodynamics

Show Detailed Complexation Query Results


Surface Complex Formation Data:

Mineral: Gibbsite
Reference: EA08
SCM Type: 1pK-BS - 1pK-Basic Stern
Ligand: AsO4<3-> - arsenate
Site Type: »Al-singly
Equation: 2 »Al-singly + AsO4<3-> + 2 H<1+>  ⇔  (»Al-singlyO)2-AsO2<2-> + 2 H2O
LogK: 30.48        LogK°I=0 (Conversion to I = 0):   30.48         LogK2.31 nm−2 (SSD-normalized):   31.75
Experiment: Batch Sorption Experiments
Ionic Strength: 0.0 mol/L NaCl
Solid/Liquid Ratio: 10.0 g/L
pH Range: 3-10
Ligand Concentration Range: <0.0001 mol/L
Fit Method: FITEQL
Comment: T = 293.15-295.15 K, CO2-free solutions were used, which are stored under N2, logK fitted for zero ionic strength, experimented were done with 0.01 or 0.001 mol/L NaCl, Optimized values from FITEQL unless noted otherwise; the log Kint value for bidentate surface complex formation that is given in parentheses was computed according to Kint = rho*A*NS*KFITEQL, where rho is the solid/solution ratio (kg /L), A is the specific surface (m2 kg-1), NS is the site density (mol m-2), and KFITEQL is the K value optimized in FITEQL for bidentate surface complexes (TE02) logKFITEQL = 26.73
 
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