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UDC (550.835.212+542.61):(550.424:546.791.027*234/.027*238)(282.256.341) APPLICATION OF SEQUENTIAL EXTRACTION AND ALPHA SPECTROMETRY FOR THE STUDY OF MIGRATION PATHS AND FORMS OF U ACCUMULATION IN COMPONENTS OF LAKE SYSTEMS
Yu. S. Vosel, V. D. Strakhovenko, I. V. Makarova
Uranium in bottom sediments of three lakes in Baikal region with the carbonate type of deposition was studied by the geochemical methods, to reveal the ways of its migration and accumulation in the components of lake systems. Lakes are characterized by different hydrological regime of the water body: Lake Alyaty is a fresh, poorly flowing, Lakes in Ol’khon Region (Tsagan-Tyrm – salty and Namshi-Nur – fresh) fed completely by ground waters. Sediments and catchment soil are separated into fractions by method of sequential extraction. In fractions obtained by alpha spectrometry the isotopes 234U and 238U determines. Studies have shown that using the method of sequential extraction and isotopic analysis can be in sufficient detail to determine the migration route of U. According to investigations, the forms of uranium in bottom sediments and its total concentrations meet the hydrogeographic and climate conditions of the described lakes.
Key words: lacustrine sediments, 234U/238U, sequential extraction.
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