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Aqueous Complexation of Thorium(IV), Uranium(IV), Neptunium(IV), Plutonium(III/IV), and Cerium(III/IV) with DTPA

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  • Aqueous complexation of Th(IV), U(IV), Np(IV), Pu(III/IV), and Ce(III/IV) with DTPA was studied by potentiometry, absorption spectrophotometry, and cyclic voltammetry at 1 M ionic strength and 25 °C. The stability constants for the 1:1 complex of each trivalent and tetravalent metal were calculated. From the potentiometric data, we report stability constant values for Ce(III)DTPA, Ce(III)HDTPA, and Th(IV)DTPA of log β₁₀₁ = 20.01 ± 0.02, log β₁₁₁ = 22.0 ± 0.2, and log β₁₀₁ = 29.6 ± 1, respectively. From the absorption spectrophotometry data, we report stability constant values for U(IV)DTPA, Np(IV)DTPA, and Pu(IV)DTPA of log β₁₀₁ = 31.8 ± 0.1, 32.3 ± 0.1, and 33.67 ± 0.02, respectively. From the cyclic voltammetry data, we report stability constant values for Ce(IV) and Pu(III) of log β₁₀₁ = 34.04 ± 0.04 and 20.58 ± 0.04, respectively. The values obtained in this work are compared and discussed with respect to the ionic radius of each cationic metal.
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  • Brown, M. A., Paulenova, A., & Gelis, A. V. (2012). Aqueous complexation of thorium(IV), uranium(IV), neptunium(IV), plutonium(III/IV), and cerium(III/IV) with DTPA. Inorganic Chemistry, 51(14), 7741-7748. doi: 10.1021/ic300757k
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  • 51
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  • 14
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  • This research was performed using funding received from the DOE Office of Nuclear Energy’s Nuclear Energy University Programs and Fuel Cycle Research and Development Program, Sigma Team for Minor Actinide Separation.
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