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: 2 »Mn-OH + UO2<2+> + 2 CO3<2->  ⇔  (»Mn-O)2-UO2(CO3)2<4-> + 2 H<1+>
LogK: 6.35        LogK°I=0 (Conversion to I = 0):   6.80         LogK2.31 nm−2 (SSD-normalized):   12.94
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: Aerobic system;
Original reaction equation given as: 2(»MnOH) + UO2(CO3)2<2-> = (»MnO)2-UO2(CO3)2<4-> + 2 H<1+> with logK = -10.24; log K for U(VI) carbonate from [KKT12] table1; other conversion data from: logK1 = -6.366 for the reaction H2CO3 = H<1+> + HCO3<1-> [FNK96], logK2 = -10.329 for HCO3<1-> = H<1+> + CO3<2->[GFFGN03] --> so for H2CO3 = 2H<1+> + CO3<2-> the logK = -16.695
 
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