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Abstract
Thorium complexation with gluconate has been studied from solubility experiments at gluconate concentrations between 10−6 and 10−1 mol/l, with pHc between 9 and 13 and I=0.5 M (NaClO4). Solubility experiments indicate the formation of a 1:1 thorium:gluconate complex. The stability constant for this species, extrapolated to I=0 by using the SIT (specific interaction theory), has been determined to be log10Kº=−11.5 ± 0.6 for the reaction: Th4+ + GH4− + 2H2O = Th(OH)2(GH2)− + 4H+. In the presence of ThO2·xH2O, sorption of the organic ligand onto solid surface seems to limit thorium dissolution.
Published Online: 2011-03-16
Published in Print: 2011-05
© by Oldenbourg Wissenschaftsverlag, Barcelona, Germany
