Laboratory studies of plutonium in marine systems |
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| Affiliation: | 1. Istituto Nazionale di Geofisica e Vulcanologia, Sezione di Catania–Osservatorio Etneo, Piazza Roma 2, 95123, Catania, Italy;2. Istituto Andaluz de Geofísica, Universidad de Granada, Campus Universitario de Cartuja s/n, 18071 Granada, Spain;1. Schmidt Institute of Physics of the Earth, Russian Academy of Sciences, ul. B. Gruzinskaya 10, Moscow, 123810, Russia;2. Institute of Computational Mathematics and Mathematical Geophysics, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Lavrent’eva 6, 630090, Russia;3. Institute of Computational Technologies, Siberian Branch of the Russian Academy of Sciences, pr. Akademika Lavrent’eva 6, Novosibirsk, 630090, Russia |
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| Abstract: | ![]()
The chemistry of plutonium in natural waters is among the most complex of any element. Much of this complexity is due to the fact that Pu can exist in up to four oxidation states (III, IV, V, VI) at one time under conditions encountered in the marine environment. The chemical properties of Pu in these different oxidation states differ dramatically. Our examination of thermodynamic and environmental data indicates that speciation of Pu in natural waters is primarily governed by kinetic factors, and that interactions with organic compounds, such as humates, are important.Pu is primarily removed from oceanic waters by adsorption on particle surfaces. Adsorption processes are also governed by reaction kinetics. A major aspect of the adsorption chemistry of Pu on metal oxide surfaces is their ability to promote redox reactions which change the oxidation state of the adsorbed Pu. |
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