First data on the uranium content in water of the Yenisei River basin in the area affected by the operation of Rosatom plants |
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Authors: | Bolsunovskii A Ya Zhizhaev A M Saprykin A I Degermendzhi A G Rubailo A I |
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Institution: | 1.Institute of Biophysics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, Russia ;2.Institute of Chemistry and Chemical Engineering, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, Russia ;3.Nikolaev Institute of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences, Novosibirsk, Russia ; |
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Abstract: | This study is devoted to investigating the content of uranium isotopes in water of the Yenisei River and its tributaries within
the territories affected by the operation of Rosatom plants (mining chemical combine, and electrochemical plant). Long-term
monitoring of the 238U content by mass spectrometry carried out in two institutes of the Siberian Branch of the Russian Academy of Sciences first
revealed the multiple excess of 238U over the background content in different areas of the Yenisei River basin, such as the region of the Yenisei River near
the effluents of the mining and chemical combine (MCC), and the territories of the Bol’shaya Tel’ and Kan rivers. In these
regions, the 238U content in water reaches 2.1–4.0 μg/l, which exceeds its content upstream from the MCC (0.3–0.6 μg/l) by almost an order
of magnitude. The studies of the isotopic composition of uranium in water samples, which were carried out at the Institute
of Inorganic Chemistry, Siberian Branch, Russian Academy of Sciences, showed the presence of a technogenic isotope of uranium
236U in the samples from the Bolshaya Tel’ River and revealed the deviation of the isotope ratio 238U/235U (167 ± 3 and 177 ± 3) from the equilibrium natural ratio (238U/235U = 138). These facts attest to the technogenic origin of part of the uranium in water of the Bol’shaya Tel’ River connected
with the activity of MCC. The excess uranium content in the Kan River requires additional studies to ascertain the fraction
of uranium of technogenic origin connected with the activity of the electrochemical plant (ECP) (Fig. 1, Table 4). |
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