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Simulation on the Distribution of Vanadium- and Iron-Picolinate Complexes in the Decontamination Waste Solution  

Shim, Joon-Bo (Division of Nuclear Chemical Engineering Research, Korea Atomic Energy Research Institute)
Oh, Won-Zin (Division of Decontamination and Decommissioning Technology Development, Korea Atomic Energy Research Institute)
Kim, Jong-Duk (Department of Chemical and Biomolecular Engineering, Korea Advanced Institute Science and Technology)
Publication Information
Korean Chemical Engineering Research / v.43, no.1, 2005 , pp. 33-38 More about this Journal
Abstract
The distribution of vanadium and iron ionic species in the presence of picolinate ligand has been simulated at various conditions with different pH values and compositions in the decontamination waste solution. In spite of variations of metal concentration in the decontamination solution, the shape of distribution diagrams were not changed greatly at both high (the molar ratio of picolinate to vanadium is 6) and low (the molar ratio is 3) LOMI decontamination conditions. However, in the solution of low-picolinate condition the shape of the distribution diagram of iron(II)-picolinate complexes was changed significantly. This phenomenon is attributed to the shortage of relative amount of picolinate ligand to iron existed in the solution, and originated from the difference in stability constants for complexes formed between vanadium(III) and iron(II) species with picolinate ligand. The distribution diagrams obtained in this study can be applied very usefully to the prediction or understanding the reaction phenomena occurred at various conditions in the course of the LOMI waste treatments such as an ion exchange operation.
Keywords
Decontamination; Distribution; Picolinate; Complexes; Waste Solution; Iron; Vanadium;
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