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Accumulation and release of 99Tc by a macrophyte of the Yenisei River (Elodea canadensis) in laboratory experiments / A. Bolsunovsky, L. Bondareva // Journal of Radioanalytical and Nuclear Chemistry. - 2008. - Vol. 277, Is. 3. - P631-636, DOI 10.1007/s10967-007-7148-5 . - ISSN 0236-5731
Кл.слова (ненормированные):
technetium 99m -- aquatic flora -- article -- biomass -- controlled study -- dry weight -- liquid scintillation counting -- macrophyte -- nonhuman -- radiation absorption -- radiation detection -- radiation dose fractionation -- radiation measurement -- radioactivity -- river -- water sampling
Аннотация: The study addresses 99Tc accumulation and release by Elodea canadensis, one of the abundant species of submerged plants in the Yenisei River. 99Tc in water samples of the "Elodea - Yenisei River water" model system and in the biomass fractions was measured using a liquid scintillation analyzer. Experiments on accumulation of 99Tc by Elodea showed that 99Tc activity concentration can reach 120В±6 Bq/g dry wt, with the concentration factor for 99Tc 2700В±500 l/kg dry wt. In experiments on 99Tc release, over 504 hours about 82% of the total 99Tc activity was released into the water from the plant; most of 99Tc was released within the first 192 hours. The data obtained using sequential chemical fractionation of biomass confirmed the experimental data on 99Tc release, which suggested that most of the biomass-bound 99Tc was adsorbed on the surface of Elodea. 99Tc tightly bound to biomass (fractions of organics and mineral residue) constituted just 17% of the total 99Tc activity. В© 2008 Akademiai Kiado, Budapest.

Scopus
Держатели документа:
Institute of Biophysics, Siberian Branch of the Russian Academy of Sciences, Krasnoyarsk 660036, Russian Federation : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Bolsunovsky, A.; Bondareva, L.

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First data on technetium-99 content in the ecosystem of the Yenisei River / A. Ya. Bolsunovskii, Yu. V. Aleksandrova, A. G. Degermendzhi // Doklady Earth Sciences. - 2010. - Vol. 434, Is. 1. - P1219-1221, DOI 10.1134/S1028334X10090163 . - ISSN 1028-334X
Кл.слова (ненормированные):
Aquatic plants -- Concentration factors -- Dumping site -- Filtered water -- Laboratory conditions -- Maximal values -- Radioactive effluents -- Technetium 99 -- Ecology -- Effluents -- Sewage -- Technetium -- Wastewater -- Water content -- aquatic plant -- bioaccumulation -- freshwater ecosystem -- radioactive pollution -- river water -- technetium isotope -- Russian Federation -- Yenisei River -- Potamogeton lucens
Аннотация: The content of a long-lived technogenic radionuclide 99Tc in the Yenisei within the territory of radioactive effluents of the Rosatom mining chemical combine (MCC) has been studied. In 2008-2009 the maximal 99Tc content in water was registered near the dumping site of the MCC and came to 33 mBq/l. According to analysis of filtered water samples, technetium in the Yenisei water is presented as pertechnetate ion (TcO 4). When moving away from the MCC downstream, the 99Tc content in water is decreased, which is caused both by dilution of waste water and by 99Tc accumulation by aquatic plants. The 99Tc content in the biomass of the aquatic plant Potamogeton lucens came to 82 15 Bq/kg, and the concentration factor (CF) to 8200, which is three times more than the maximal values of the CF of 99Tc by the plants in laboratory conditions (2700). В© 2010 Pleiades Publishing, Ltd.

Scopus
Держатели документа:
Institute of Biophysics, Siberian Branch, Russian Academy of Sciences, Krasnoyarsk, Russian Federation : 660036, Красноярск, Академгородок, д. 50, стр. 50

Доп.точки доступа:
Bolsunovskii, A.Ya.; Aleksandrova, Yu.V.; Degermendzhi, A.G.

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