The speciation of plutonium and neptunium in colloid suspension collected from the contaminated aquifer of the “Mayak” site was studied by nano-SIMS, XPS and XANES. At tracer level concentration found in original groundwater sample Pu is sorbed onto hydrous ferric oxide colloids, while at higher concentration relevant to near-field conditions it forms intrinsic PuO 2 × n H 2 O colloids. The formation of such colloids occurs through the reduction of Pu(V) to Pu(IV) upon its sorption.
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Kalmykov et al. (2007) studied this question.
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