Coordination chemistry of two heavy metals: I, Ligand preferences in lead(II) complexation, toward the development of therapeutic agents for lead poisoning: II, Plutonium solubility and speciation relevant to the environment

Near-field/altered-zone models report

“…, PuO 2 + , and PuO 2 2+ has been investigated in J-13 water at 25°C (Nitsche and Edelstein, 1985) and dilute carbonic acid solutions at pH = 6, 0.057-atm CO 2 partial pressure, and 30°C (Neu, 1993). The experiments were monitored for 25 to 150 days.…”

“…When Pu is introduced as PuO 2 + or PuO 2 2+ , kinetic considerations may cause the initial precipitation of metastable NaPuO 2 CO 3 hydrate followed by slow conversion to a less-soluble Pu(IV) hydrous oxide. Disproportionation of Pu(V) is very slow under the conditions investigated in Nitsche and Edelstein (1985) and Neu (1993), but studies of Pu(V) in near-neutral solutions at 75°C indicate that the Pu concentration decreases to 10 Ð6 M in less than 18 hr in the presence of carbonate (Wruck and Palmer, 1996). Solubility studies have been reported for Pu introduced as Pu 3+ , Pu 4+ , Pu(IV) polymer, PuO 2 + , and PuO 2 2+ in a synthetic brine solution under oxic conditions .…”