RES³T - Rossendorf Expert System for Surface and Sorption Thermodynamics

Show Detailed Complexation Query Results


Surface Complex Formation Data:

Mineral: Bentonite
Reference: SVSBC98
SCM Type: CC - Constant Capacitance
Ligand: UO2<2+> - uranyl(VI)
Site Type: »X-OH
Equation: »X-OH + UO2<2+> + 3 CO3<2-> + H<1+>  ⇔  »X-OH2-UO2(CO3)3<3->
LogK: 38.25        LogK°I=0 (Conversion to I = 0):   40.07         LogK2.31 nm−2 (SSD-normalized):   42.19
Experiment: Batch Sorption Experiments
Ionic Strength: 0.1 mol/L granitic water
Temperature: 298.0 K
Solid/Liquid Ratio: 1.98 g/L
pH Range: 4-11
Ligand Concentration Range: 6.67E-7 mol/L
Fit Method: FITEQL
Comment: recaculation of the given equation: »X-OH + H<1+> = »X-OH2<1+> logK2 =- pK1; »X-OH2<1+>+UO2(CO3)3<4->=»X-OH2-UO2(CO3)3<3-> logK7; UO2<2+>+3CO3<2->=UO2(CO3)3<4-> logKU4=21.84; »X-OH+UO2<2+>+H<1+>+2CO3<2->=»X-OH2-UO2(CO3)2<3-> logK7+logKU4+logK2
 
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