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Your search keyword '"Blinova, Oxana"' showing total 3 results
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3 results on '"Blinova, Oxana"'

1. Fate of anthropogenic radionuclides (90Sr, 137Cs, 238Pu, 239Pu, 240Pu, 241Am) in seawater in the northern Benguela upwelling system off Namibia

Author

Ministerio de Ciencia, Innovación y Universidades (España), Rozmaric, M., Chamizo, Elena, Louw, Deon C., López-Lora, Mercedes, Blinova, Oxana, Levy, Isabelle, Mudumbi, B., Plas, A. K. van der, García-Tenorio, R., McGinnity, P., Osvath, Iolanda, Ministerio de Ciencia, Innovación y Universidades (España), Rozmaric, M., Chamizo, Elena, Louw, Deon C., López-Lora, Mercedes, Blinova, Oxana, Levy, Isabelle, Mudumbi, B., Plas, A. K. van der, García-Tenorio, R., McGinnity, P., and Osvath, Iolanda

Abstract

A baseline study on anthropogenic radioactivity in the Namibian marine ecosystem, which is part of the northern Benguela upwelling system, known as one of the most productive ocean areas in the world, has been performed. A scientific cruise carried out in 2014 covering inshore and offshore areas, exhibiting different oceanographic features, has provided a basis for better understanding the distributions, ratios and inventories of six anthropogenic radionuclides (Sr, Cs, Pu, Pu, Pu and Am) in seawater. Although H was also measured, due to extremely low levels, its behaviour was not studied. The main source of Sr, Cs, Pu, Pu and Am in the samples analysed was proven to be global fallout, a finding further confirmed by Pu/Pu and Sr/Cs ratios. Furthermore, the Pu SNAP-9A satellite accident signal was confirmed once again through the determination of the Pu/Pu activity ratio. Inshore and offshore samples showed different patterns due to the unique oceanographic features of this upwelling system. The levels of anthropogenic radionuclides, comprehensively assessed for the first time in this region, are comparable with the few existing data and filled a critical gap for the Southern Atlantic Ocean.

Published
2022

2. Scavenging of select radionuclides and trace elements by pelagic Sargassum in the Caribbean Sea.

Author

Bam W, Swarzenski PW, Maiti K, Vassileva E, Orani AM, Blinova O, McGinnity P, Adhikari PL, Haughton M, and Webber M

Subjects
Caribbean Region, Ecosystem, Humans, Lead, Radioisotopes, Sargassum, Trace Elements analysis
Abstract

In recent years, the North Atlantic and the Caribbean Sea have experienced unusual and unprecedented pelagic Sargassum blooms, which may adversely affect coastal ecosystems and productive ocean. Sargassum has the potential to scavenge trace elements and radionuclides from seawater, and when bioaccumulated and thus concentrated, can pose a potential threat to higher trophic organisms, including humans that consume impacted seafood. In this study, trace elements and naturally-occurring U/Th-series radionuclides were measured in Sargassum that were collected in the coastal waters of the Caribbean Sea (Antigua/Barbuda, Belize, and Barbados) to better define baseline concentrations and activities, and to assess the scavenging potential for these trace elements and radionuclides. The mean concentration of trace elements observed in Sargassum collected across these three Caribbean Sea are ranked accordingly to the following descending order: Sr > As>Fe > Mn > Zn > Ni > V > C > Cd > Se > Co > Cr > Pb > Ag > Hg. 210-Po and 210 Pb activities in Sargassum were observed to be more elevated than previously reported values., (Copyright © 2022 Elsevier Ltd. All rights reserved.)

Published
2022
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3. Hg and 210 Po in consumed fish of the Tadjoura Gulf (Djibouti): Levels and human health risk assessment.

Author

Mahdi Ahmed M, Osman Awaleh M, Rozmaric M, Blinova O, Ibrahim Adan AB, Said Ismael I, and Ali Chirdon M

Subjects
Animals, Child, Djibouti, Fishes, Humans, Risk Assessment, Mercury analysis, Polonium analysis, Water Pollutants, Chemical analysis
Abstract

Hg and 210 Po were measured in the muscle tissue of commercially important fish species collected in the main coastal cities of the Djiboutian coast (Tadjoura Gulf) to evaluate the potential risk associated with their consumption. The levels of Hg among the different species ranged from 0.02 to 1.69 mg/kg w.w and exceeded tolerable limits as reported by the national regulation (2000-0727/PR/MAEM) and the Codex Alimentarius. The probabilistic distributions of health hazard were evaluated through Monte-Carlo simulation, which confirmed the carcinogenic risk from Hg. The levels of 210 Po ranged from 4.1 to 134.5 Bq/kg w.w among muscle tissues of the eight commercially important species. The carcinogenic risk was in an unacceptable range and simulation revealed that children were the most vulnerable population. The results obtained confirms that the health impact is reduced when consuming two servings per week., (Copyright © 2021 Elsevier Ltd. All rights reserved.)

Published
2021
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