RES³T - Rossendorf Expert System for Surface and Sorption Thermodynamics

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Surface Complex Formation Data:

Mineral: α-MnO2
Reference: KSCKT18
SCM Type: DDL - Diffuse Double Layer
Ligand: UO2<2+> - uranyl(VI)
Site Type: »Mn-OH
Equation: »Mn-OH + UO2<2+> + 3 H2O  ⇔  »Mn-O-UO2(OH)3<2-> + 4 H<1+>
LogK: -37.05        LogK°I=0 (Conversion to I = 0):   -37.05         LogK2.31 nm−2 (SSD-normalized):   -33.75
Experiment: Batch Sorption Experiments
Ionic Strength: 0.01 mol/L NaClO4
Solid/Liquid Ratio: 1.0 g/L
pH Range: 2 - 11
Ligand Concentration Range: 8.2E-5 mol/L
Fit Method: FITEQL
Comment: Anaerobic system;
original equation in the study: »Mn-OH + UO2(OH)3<1-> = »Mn-O-UO2(OH)3<2-> + H<1+> with log K = -16.8 (UO2<2+> + 3H2O ⇌ UO2(OH)3<1−> + 3H<1+>, log K = -20.25 from a thermodynamic database published by Nuclear Energy Agency [GFFGN03])
 
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