Abstract
Plutonium sorption on various types of sands of reservoir horizon depends on the presence of corrosion products in solutions simulating highly saline acidic (pH 2.4) liquid radioactive waste (LRW) under hydrothermal conditions (T = 150°C, 50 h). The effect of corrosion products (Fe, Cr) present in LRW consists not only in considerably increased Pu sorption, but also in increased fraction of its strongly fixed fraction. α-Track radiography revealed essentially heterogeneous distribution of Pu between mineral phases of sands of reservoir horizon after interaction with simulated LRW and predominant association of Pu with separate phases containing Fe and Cr (data of X-ray microanalysis based on scanning electron microscopy, SEM-EDX). Examination by Raman spectroscopy and X-ray diffraction analysis showed that the phases responsible for the predominant sorption of Pu are phases of Cr-containing hematite.
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