The pentavalent actinide solution chemistry in the environment

For the first time, new data were provided for Pu(V) interactions with carbonate, sulfate, oxalate, chloride, and nitrate ions, allowing the Np(V)/Pu(V) analogy to be verified experimentally. Knowledge of Np(V) chemistry, especially in carbonate, and sulfate media, was also refined. These CE-ICP-MS studies, combined with some earlier findings, have brought about a renewal in the knowledge of An(V) chemistry in solution. Pu(V) speciation diagram in seawater, as a function of pH, using the CE-ICP-MS data (Topin et al., 2009a, Topin et al., 2009b, Topin et al., 2010) (dashed lines), and data from NEA (Guillaumont, 2003) (filled-in areas) (Np(V) data is used for Pu(V) data, when these are unknown). Conditions: I = 0.60 mol l−1, [SO42−] = 0.03 mol l−1, [C1−] = 0.55 mol−l−1, Pco2 = 3·10-4 bar, T = 25 ± 1 °C).155