RES³T - Rossendorf Expert System for Surface and Sorption Thermodynamics

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Surface Complex Formation Data:

Mineral: Calcite
Reference: SPJL08
SCM Type: CC - Constant Capacitance
Ligand: AsO4<3-> - arsenate
Site Type: »Ca(s)-CO3<1->
Equation: »Ca(s)-CO3<1-> + AsO4<3-> + H<1+>  ⇔  »Ca(s)-H-AsO<1-> + CO3<2->
LogK: 10.48        LogK°I=0 (Conversion to I = 0):   10.48
Experiment: Batch Sorption Experiments
Ionic Strength: 0.0 mol/L
pH Range: 6 - 9
Ligand Concentration Range: 6.7E-7 - 6.7E-6 mol/L
Fit Method: PHREEQC
Comment: 4g of calcite in 13-20 mL solution; original equation in the study: »Ca(s)-CO3<1-> + H2AsO4<1-> = »Ca(s)-HAsO4<1-> + H<1+> + CO3<2-> with log K = -7.98 (Equilibrium constants for aqueous speciation of arsenate taken from Table 2)
 
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