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UDC (550.424+543.429.22):(546.791:551.312.46)(517-16) URANIUM IMMOBILIZATION BY THE SALINE LAKE BOTTOM SEDIMENTS IN NORTH-WESTERN MONGOLIA
T. I. Markovich, L. I. Razvorotneva, V. P. Isupov, L. G. Gilinskaya, A. G. Vladimirov
The uranium content in bottom sediments of saline lakes located in the north-western regions of Mongolia is investigated. It is shown that alkaline soda lake waters contribute to an uranium accumulaton in the form of carbonate complexes of uranylion. Sequential graded desalination method was used to analyze the uranium occurrence forms in bottom sediments by the example of Shaazgay Nuur Lake. Using the complex of physical-chemical methods it was determined that the clay minerals are the main participants in the uranium immobilization. More than 40% of uranium is binding by iron-bearing hydroxide precipitation forms. The redox interaction between the U(VI) and ions of Fe(II), located in the octahedral positions of montmorillonite structure is identified by EPR method.
Key words: radionuclides, sorption, geochemical barriers, uranium.
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