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From a thermodynamic standpoint, the formation of Pu(V) or Pu(VI), both of which would be less subject than Pu(1V) to insolubilization through hydrolysis, is also theoretically possible. , 1979a), however, that interaction of Pu(V) to (VI) with soil microbial metabolites, root exudates, and reduced Fe in the vicinity of the root would result in their reduction to Pu(IV), even in aerobic surface soils. The predominance of Pu(1V) in soil would further accentuate the importance of organic complexes in maintaining soluble Pu species in soil.

5) indicated that most of the material was initially present as a negatively charged organic complex, P U ~ ( D T P A )but ~ , that small quantities of Pu remained a t the origin (probably hydrolyzed forms) and were present as additional negatively and positively charged components. Elution of the sterile medium through soil removed the positively charged material, perhaps accounting for the 7% reduction observed in solubility (Table 5), and apparently redistributed some of the Pu to soil ligands with different electrophoretic mobility.

1978). If such complexes form for Pu and if they remain in solution, the adsorption of Pu should decrease in waters having high DOC. This effect was observed by Wahlgren and Orlandini (1982), who reported a strong inverse correlation between the K d for ambient reduced Pu and the concentration of DOC in a series of North American lakes. No significant correlations were observed with other limnological parameters. This suggests that DOC was of paramount importance in determining the K d of reduced Pu.

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

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