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Extra info for Environmental Research on Actinide Elements [symp. procs, 1983]

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PLUTONIUM INTERACTIONS WITH SOIL MICROBIAL METABOLITES -, 25 and T. R. Garland, 1980, The Relationship of Microbial Processes to the Fate and Behavior of Transuranic Elements in Soils, Plants, and Animals, Transuranic Elements in the Enwironm t , W. C. ), DOE/TIC-22800. -, and T. R. Garland, 1982, Effects of Plutonium on Soil Microorganisms, Appl Envirm MicrobioL, 43(2): 418-423. Chemical Speciation of Plutonium in Natural Waters D. M. NELSON, R. P. LARSEN, and W. R. PENROSE Environmental Effects Research Program, Environmental Research Division, Argonne National Laboratory, Argonne, Illinois Abstract: The behavior of plutonium (Pu) in natural waters is determined to a major degree by which chemical forms of the element are present.

Its presence should not be interpreted as revealing anything about the “solubility” of Pu, but rather should serve as a warning about the difficulties inherent in maintaining natural waters in a particle-free state. Had these experiments been done a t a single Pu concentration, the presence of this particle-associated Pu could easily have been misinterpreted as evidence suggesting precipitation of some Pu compound. An additional disadvantage of doing experiments in “particle-free” water is the length of time necessary for the systems to reach a steady state.

Initial spikes were Pu(IV), and equilibrium time was 7 days. 45 pm. *lo00 molecular weight (Amicon UM2). to changes in the concentration of solids present, with the reduced form being relatively more abundant (in solution) a t low solids concentrations. Although not conclusive, this trend is the same as that previously seen for seawater. Water samples from the open ocean, in which particle concentrations are very low, showed a higher percentage of dissolved Pu present in the reduced forms than did samples collected near shore.

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