Accumulation and release of 241Am by a macrophyte of the Yenisei River (Elodea canadensis)

Bolsunovsky, A. Ya.; Зотина, Т. А.; Bondareva, L. G.

doi:10.1016/j.jenvrad.2004.10.012

Cited by 29 publications

(25 citation statements)

References 9 publications

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“…The parameters of radionuclide accumulation by plants were calculated per unit of dry weight. 99 To estimate the mobility of 99 Tc contained in the plant, we used the method of sequential chemical extraction [2]. Technetium of the exchangeable fraction was separated by exposing the plant biomass to the action of a CH 3 COONH 4 solution (1 M) for 24 h. To separate 99 Tc of the adsorbed fraction, the plant biomass was treated with a H 2 SO 4 solution (0.2 M) for 20 min.…”

Section: Methodsmentioning

confidence: 99%

Bioavailability of⁹⁹Tc to a macrophyte of the Yenisei River

Bondareva

Bolsunovsky

2009

Radioprotection

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Abstract.The experiments on accumulation of 99 Tc by Elodea biomass showed that 99 Tc activity concentration can reach 120 ± 6 Bq/g, with the concentration factor for 99 Tc 2700 ± 500 L/kg. In experiments on 99 Tc release, over 504 h about 82% of the total 99 Tc activity was released into the water from plant biomass; most of 99 Tc was released within the first 192 h. Results of chemical fractionation of the biomass show that 99 Tc contained in biomass was mainly concentrated in the exchangeable and the adsorbed fractions (83%). Thus, the data obtained using chemical fractionation of biomass confirmed the experimental data on 99 Tc release, which suggested that most of the biomass-bound 99 Tc was adsorbed on the biomass surface. 99 Tc tightly bound to Elodea biomass (fractions of organics and mineral residue) constituted just 17% of the total 99 Tc activity. Decreased illumination of Elodea shoots during the experiment did not cause any reduction in 99 Tc activity concentration or concentration factor. Results of chemical fractionation of the biomass grown under lower illumination conditions show that the percentage of 99 Tc tightly bound to Elodea biomass (fractions of organics and mineral residue) decreased while the 99 Tc of the adsorbed fractions decreased. Our results and data reported by other authors suggest that some part of 99 Tc activity can be bioavailable to living organisms and that the portion of bioavailable 99 Tc can be determined by a number of factors.

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Section: Methodsmentioning

confidence: 99%

Bioavailability of⁹⁹Tc to a macrophyte of the Yenisei River

Bondareva

Bolsunovsky

2009

Radioprotection

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“…It has been shown recently that biosorption of 241 Am by Saccharomyces can occur due to nonspecific adsorption on cell wall, ion exchange and complexation [15] simultaneously. It has been experimentally shown before that the major part of americium registered in the biomass of Elodea was present in the acid removable form [8].…”

Section: Distribution Of 241 Am Among Biomass Fractionsmentioning

confidence: 96%

“…The accumulation of 241 Am by the biomass of Elodea from water in batch experiments was represented by a typical saturation curve [8]. The uptake of 241 Am by Elodea from water stopped after 2 days of exposure.…”

Section: Distribution Of 241 Am Between the Leaves And The Stemmentioning

confidence: 99%

“…This radionuclide is detected in bottom sediments and biomass of aquatic plants in the radioactively contaminated part of the Yenisei River [6]. Our laboratory experiments showed that Elodea canadensis, one of the most frequently occurring submerged macrophytes in the Yenisei River [7], can accumulate high 241 Am activity in its biomass [8] from water. The purpose of this study was to estimate the distribution of 241 Am among photoassimilating organs of E.canadensis, among cell compartments, and fractions of lipids, proteins and polysaccharides.…”

Section: Introductionmentioning

confidence: 98%

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Accumulation and distribution of²⁴¹Am in the biomass of freshwater plantElodea canadensis

2009

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Abstract. Accumulation of transuranic element 241 Am by photoassimilating organs and its distribution in fractions of the biomass of aquatic plant Elodea canadensis have been investigated in laboratory batch experiments. Americium was taken up by apical shoots of Elodea from water. Of the activity accumulated by the shoots, up to 80% of 241 Am was detected in the leaves and 20% in the stems. Americium concentration in apical leaves was several times higher than in distal leaves. Of the 241 Am activity concentrated in the shoots, 95% was bound to cell walls, membranes and organelles and 5% of the radionuclide was dissolved in cytoplasm. Less than 1% of americium accumulated in the biomass was found in the lipid extract; up to 10% of americium was bound to proteins and carbohydrates; the major part of the radionuclide (about 90%) was registered in the cell wall fraction that mainly contained celluloselike polysaccharides. Biomass treatment with hydrochloric acid resulted in desorption of about 70% of americium, mostly from the polysaccharides.

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“…Soil separation was performed using the procedure described by Klemt et al [4]. Chemical fractionation of mushrooms was performed using a modified procedure of sequential chemical extraction for plants described by Bolsunovsky et al [5]. The procedure was modified by uniting the "exchangeable" and the "adsorption" fractions into one "surface-adsorption" fraction.…”

Section: Chemical Fractionation Of Soil and Mushroom Samplesmentioning

confidence: 99%

Accumulation of artificial radionuclides by edible wild mushrooms and berries in the forests of the central part of the Krasnoyarskii Krai

Dementyev

Bolsunovsky

2009

Radioprotection

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Abstract.The study addresses accumulation of radionuclides by mushrooms and berry shrubs from the forest soil in the 30-km area around the MCC (the Krasnoyarskii Krai, Russia). The Suillus granulatus and S. luteus mushrooms have been found to be the best bioindicators in this area. The level of 137 Cs concentration in these species can reach 10 kBq/kg dry mass. The 137 Cs transfer factor (TF) by the mushrooms varies 5-fold among the sites that receive radionuclides from different sources. The level of radionuclide activities accumulated by berry shrubs is 2-3 orders of magnitude lower than the activities accumulated by mushrooms. No relationship has been found between the TFs of radionuclides to the shrubs and the pathway via which the radionuclides enter the soil. The contribution of the dose due to intake of mushrooms and berries to the annual effective dose of internal exposure to residents does not exceed 150 Sv/year and 1.4 Sv/year, respectively, estimated from the registered levels of accumulated 137 Cs.

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Accumulation and release of 241Am by a macrophyte of the Yenisei River (Elodea canadensis)

Cited by 29 publications

References 9 publications

Bioavailability of⁹⁹Tc to a macrophyte of the Yenisei River

Bioavailability of⁹⁹Tc to a macrophyte of the Yenisei River

Accumulation and distribution of²⁴¹Am in the biomass of freshwater plantElodea canadensis

Accumulation of artificial radionuclides by edible wild mushrooms and berries in the forests of the central part of the Krasnoyarskii Krai

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Accumulation and release of 241Am by a macrophyte of the Yenisei River (Elodea canadensis)

Cited by 29 publications

References 9 publications

Bioavailability of99Tc to a macrophyte of the Yenisei River

Bioavailability of99Tc to a macrophyte of the Yenisei River

Accumulation and distribution of241Am in the biomass of freshwater plantElodea canadensis

Accumulation of artificial radionuclides by edible wild mushrooms and berries in the forests of the central part of the Krasnoyarskii Krai

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Bioavailability of⁹⁹Tc to a macrophyte of the Yenisei River

Bioavailability of⁹⁹Tc to a macrophyte of the Yenisei River

Accumulation and distribution of²⁴¹Am in the biomass of freshwater plantElodea canadensis