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| Titel |
Fe-Mn substance in ocean as reason of regulation radionuclide pollution |
| VerfasserIn |
Alex Asavin, Konstantin Martynov, Lia Konstantinova |
| Konferenz |
EGU General Assembly 2013
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| Medientyp |
Artikel
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| Sprache |
Englisch
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 15 (2013) |
| Datensatznummer |
250079296
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| Zusammenfassung |
| Distribution of radionuclide in marine sediments as yet little studied [Choppin & Wong
1998]. The work mainly focused on effects of nuclear test fallout. In the works are examined
isotopes of Pu - 238; Th - 232; U -234;238; Pu - 239,240,241; Am - 241; Np - 237; Cm -244
[Holm 1995].
It has been shown that seems to accumulate radionuclides in marine sediments. In
particular, the importance attached to carbonate complexes (corals, etc.).
But questions about the possibility of re-mobilization of radionuclide, forms their
concentration, their participation in global geochemical cycles in the ocean, remain open. We
believe a major factor controlling the distribution of heavy metals is the formation of
ocean ferromanganese crusts and nodules hydrogenic at the bottom of the ocean and
seamounts. It is likely that the process of formation of Fe-manganese hydrogenic
can play a major role in the control of radioactive contamination in the oceanic
sediment. At least for the U number of works on the subject [Sherman et al. 2008]. The
high sensitivity of the Fe-manganese crust is known to the isotopic composition of
lead [Loranger & Zayed 1994, Collen et al 2011]. Recent work [Wilkins etal 2006,
Renshaw etal 2009] show a large role; Fe (III)-and Mn (IV)-reducing organisms that
anaerobic bacteria in oxidation and therefore changes in mobility systems U and
Pu.
So much interest is data for sorption of radionuclide on hydroxides Fe and Mn.
Unfortunately we are not aware of works on the subject. We have therefore taken their own
experimental studies on sorption of radionuclide on natural Fe-Mn crusts (sample from
Magellan seamount Pacific ocean) [Martynov et al 2012].
The results showed high sorption ability of material crusts for fixation of radionuclides:
U-233, Np-237, Pu-238, Am-241. For all radionuclide experiment absorption has been
reached already in the first hour it was 96.0% of total substance radionuclide absorbed from
the solution, and after the first day it was reached the level closed to the ultimate extraction
99.0%. The relative number of increasing absorption of radionuclide Np |
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