| Translocation of (125)I, (75)Se and (36)Cl to Wheat edible parts following wet foliar contamination under field conditions. | |
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MedLine Citation:
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PMID: 22608977 Owner: NLM Status: Publisher |
Abstract/OtherAbstract:
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Apart from radiocaesium and radiostrontium, there have been few studies on the foliar transfer of radionuclides in plants. Consequently, specific translocation factor (f(tr)) values for (129)I, (79)Se and (36)Cl are still missing from the IAEA reference databases. The translocation of short - lived isotopes, (125)I and (75)Se, and of (36)Cl to wheat grain were measured under field conditions following acute and chronic wet foliar contamination at various plant growth stages in the absence of leaching caused by rain. The translocation factors ranged from 0.02% to 1.1% for (125)I (a value similar to Sr), from 0.1% to 16.5% for (75)Se, and from 1% to 14.9% for (36)Cl. Both (36)Cl and (75)Se were as mobile as Cs. The phenomenological analysis showed that each element displayed a specific behavior. Iodide showed the lowest apparent mobility because of its preferential fixation in or on the leaves and a significant amount probably volatilized. Selenite internal transfer was significant and possibly utilized the sulphur metabolic pathway. However bio - methylation of selenite may have led to increased volatilization. Chloride was very mobile and quickly diffused throughout the plant. In addition, the analysis underlined the importance of plant growth responses to annual variations in weather conditions that can affect open field experiments because plant growth stage played a major role in f(tr) values dispersion. The chronic contamination results suggested that a series of acute contamination events had an additive effect on translocated elements. The highest translocation value obtained for an acute contamination event was shown to be a good conservative assessment of chronic contamination if data on chronic contamination translocation are lacking. The absence of rain leaching during the experiment meant that this investigation avoided potential radionuclide transfer by the roots, which also meant that radionuclide retention on or in the leaves was maximized. This study was therefore able to obtain accurate translocation factors, which are probably among the highest that could be recorded. |
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Authors:
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P Hurtevent; Y Thiry; S Levchuk; V Yoschenko; P Henner; C Madoz-Escande; E Leclerc; C Colle; V Kashparov |
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Publication Detail:
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Type: JOURNAL ARTICLE Date: 2012-5-18 |
Journal Detail:
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Title: Journal of environmental radioactivity Volume: - ISSN: 1879-1700 ISO Abbreviation: - Publication Date: 2012 May |
Date Detail:
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Created Date: 2012-5-21 Completed Date: - Revised Date: - |
Medline Journal Info:
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Nlm Unique ID: 8508119 Medline TA: J Environ Radioact Country: - |
Other Details:
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Languages: ENG Pagination: - Citation Subset: - |
Copyright Information:
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Copyright © 2012 Elsevier Ltd. All rights reserved. |
Affiliation:
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French Institute for Radiological Protection and Nuclear Safety (IRSN), PRP-ENV/SERIS/L2BT, CE Cadarache bt 186, BP 3, 13115 Saint-Paul-lez-Durance, France. |
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From MEDLINE®/PubMed®, a database of the U.S. National Library of Medicine
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