Analysis of the vertical distribution of 137 Cs and 239,240 Pu in waterlogged and non-boggy soils by the sequential extraction method.

Autor: Kazakevičiūtė-Jakučiūnienė L; State Research Institute Centre for Physical and Technological Sciences, Savanoriu av. 231, LT-02300, Vilnius, Lithuania. Electronic address: laima.kazakeviciute@ftmc.lt., Tarasiuk N; State Research Institute Centre for Physical and Technological Sciences, Savanoriu av. 231, LT-02300, Vilnius, Lithuania., Maceika E; State Research Institute Centre for Physical and Technological Sciences, Savanoriu av. 231, LT-02300, Vilnius, Lithuania., Druteikienė R; State Research Institute Centre for Physical and Technological Sciences, Savanoriu av. 231, LT-02300, Vilnius, Lithuania., Ežerinskis Ž; State Research Institute Centre for Physical and Technological Sciences, Savanoriu av. 231, LT-02300, Vilnius, Lithuania., Šapolaitė J; State Research Institute Centre for Physical and Technological Sciences, Savanoriu av. 231, LT-02300, Vilnius, Lithuania., Žukauskaitė Z; State Research Institute Centre for Physical and Technological Sciences, Savanoriu av. 231, LT-02300, Vilnius, Lithuania., Gvozdaitė R; State Research Institute Centre for Physical and Technological Sciences, Savanoriu av. 231, LT-02300, Vilnius, Lithuania.
Jazyk: angličtina
Zdroj: Journal of environmental radioactivity [J Environ Radioact] 2022 Nov; Vol. 253-254, pp. 106990. Date of Electronic Publication: 2022 Aug 29.
DOI: 10.1016/j.jenvrad.2022.106990
Abstrakt: Mobile capabilities of 137 Cs, 239,240 Pu and some stable element physicochemical forms were studied in soil layers at a depth of 6-8 cm (maximum concentrations of radionuclides) of non-boggy and waterlogged soil cores sampled on the shores of Lake Bedugnis (Lithuania). Soil samples were acidic with small amount of clay (muscovite). The radionuclide activity concentrations were about 2.5 times higher in non-boggy soil. It was explained by different conditions of deposition of radioactive fallout at these sampling sites and density of the soil samples. The value of the exchangeable fraction of radionuclides is shown to be an indicator of their migration capabilities in the soil. Under anaerobic conditions in waterlogged soil (stagnant pore water conditions) and due to the presence of clay admixture, ∼90% of 137 Cs was concentrated in the residual fraction and its mobility was low. 239,240 Pu was concentrated mainly in organic matter with rather large exchangeable fractions (∼9.6-∼13.9%). Under oxidizing conditions in non-boggy soil (dynamic pore water conditions in the case of rain), 239,240 Pu was mostly concentrated in the oxide fraction. Its exchangeable fractions were less than those in waterlogged soil and, respectively, its mobility was lower. In non-boggy soils, exchangeable fractions of 137 Cs were large and varied in the range of 10.1-12.2%, which indicated its high mobility. In the case, 137 Cs adsorption by clay materials was reduced and its residual fraction did not exceed 71.3%. The obtained data show that in the area of Lake Bedugnis, the migration capabilities of 137 Cs and 239,240 Pu change in antiphase.
Competing Interests: Declaration of competing interest The authors declare that they have no known competing financial interests or personal relationships that could have appeared to influence the work reported in this paper.
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Databáze: MEDLINE
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