RES³T - Rossendorf Expert System for Surface and Sorption Thermodynamics

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Surface Complex Formation Data:

Mineral: Illite
Reference: MG96a
SCM Type: CC - Constant Capacitance
Ligand: AsO4<3-> - arsenate
Site Type: »X-OH
Equation: »X-OH + AsO4<3-> + 3 H<1+>  ⇔  »X-H2AsO4 + H2O
LogK: 29.86        LogK°I=0 (Conversion to I = 0):   31.14         LogK2.31 nm−2 (SSD-normalized):   34.07
Experiment: Batch Sorption Experiments
Ionic Strength: 0.1 mol/L NaCl
Temperature: 295.15 K
Solid/Liquid Ratio: 2.5 g/L
pH Range: 2-11
Ligand Concentration Range: 6.7E-7 mol/L
Fit Method: FITEQL
Comment: temperature 22+-1°C; original reaction equation in the study: »X-OH + H3AsO4 = »X-H2AsO4 + H2O with logK = 9.24, formation constant in aqueous solution: AsO4<3-> + 3 H<+> = H3AsO4<0> logK = 20.62 [GFFGN03]
 
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