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: AsO3<3-> - arsenite
Site Type: »X(w)-OH
Equation: »X(w)-OH + AsO3<3-> + 2 H<1+>  ⇔  »X(w)-O-AsOOH<1-> + H2O
LogK: 28.32 ± 0.1         LogK°I=0 (Conversion to I = 0):   28.49
Experiment: Batch Sorption Experiments
Ionic Strength: 0.001 mol/L NaNO3
Temperature: 297.15 K
Solid/Liquid Ratio: 4.21 g/L
pH Range: 3.2 - 9.5
Ligand Concentration Range: 1.3E-5 mol/L
Fit Method: MINEQL
Comment: original reaction equation in the study: »X(w)-OH + H2AsO3<1-> = »X(w)-O-AsOOH<1-> + H2O with log K = 2.8±0.1, formation constant in aqueous solution: AsO3<3-> + 2H<1+> = H2AsO3<1-> logK = 25.52 (Schecher, W. D.; McAvoy, D. C. MINEQL+, V. 4.5, Users Manual, Hallowell, ME, 1998)
 
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