RES³T - Rossendorf Expert System for Surface and Sorption Thermodynamics

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Surface Complex Formation Data:

Mineral: Biotite
Reference: CWCC07
SCM Type: CC - Constant Capacitance
Ligand: AsO4<3-> - arsenate
Site Type: »X(w)-OH
Equation: »X(w)-OH + AsO4<3-> + H<1+>  ⇔  »X(w)-O-AsO3<2-> + H2O
LogK: 17.8 ± 0.8         LogK°I=0 (Conversion to I = 0):   17.95
Experiment: Batch Sorption Experiments
Ionic Strength: 0.001 mol/L NaNO3
Temperature: 297.15 K
Solid/Liquid Ratio: 4.3 g/L
pH Range: 3.2 - 11.0
Ligand Concentration Range: 1.3E-5 mol/L
Fit Method: MINEQL
Comment: original reaction equation in the study: »X(w)-OH + HAsO4<2-> = »X(w)-O-AsO3<2-> + H2O with log K = 6.2±0.8, formation constant in aqueous solution: AsO4<3-> + H<1+> = HAsO4<2-> logK = 11.60 (Schecher, W. D.; McAvoy, D. C. MINEQL+, V. 4.5, Users Manual, Hallowell, ME, 1998)
 
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