Controls on Soluble Pu Concentrations in PuO2/Magnetite Suspensions

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• 作者：Andrew R. Felmy ; Dean A. Moore ; Carolyn I. Pearce ; Steven D. Conradson ; Odeta Qafoku ; Edgar C. Buck ; Kevin M. Rosso ; Eugene S. Ilton
• 刊名：Environmental Science & Technology (ES&T)
• 出版年：2012
• 出版时间：November 6, 2012
• 年：2012
• 卷：46
• 期：21
• 页码：11610-11617
• 全文大小：314K
• 年卷期：v.46,no.21(November 6, 2012)
• ISSN：1520-5851

文摘

Time-dependent reduction of PuO₂(am) was studied over a range of pH values in the presence of aqueous Fe(II) and magnetite (Fe₃O₄) nanoparticles. At early time frames (up to 56 days) very little aqueous Pu was mobilized from PuO₂(am), even though measured pH and redox potentials, coupled to equilibrium thermodynamic modeling, indicated the potential for significant reduction of PuO₂(am) to relatively soluble Pu(III). Introduction of Eu(III) or Nd(III) to the suspensions as competitive cations to displace possible sorbed Pu(III) resulted in the release of significant concentrations of aqueous Pu. However, the similarity of aqueous Pu concentrations that resulted from the introduction of Eu(III)/Nd(III) to suspensions with and without magnetite indicated that the Pu was solubilized from PuO₂(am), not from magnetite.