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Time series of I-129 and I-127 speciation in precipitation from Denmark
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Ion Physics. (jonfysik)
2009 (English)In: Environmental Science and Technology, ISSN 0013-936X, E-ISSN 1520-5851, Vol. 43, no 17, 6522-6528 p.Article in journal (Refereed) Published
Abstract [en]

Environmental I-129 mainly released from reprocessing plants at La Hague (France) and Sellafield (UK) provides a unique atmospheric and   environmental tracer, This study deals with I-129 and I-127 speciation   in precipitation collected in Denmark during 2001-2006 that indicates   many new findings. The concentrations of total I-129 in precipitation   vary from 0.28 to 5.63 x 10(9) atoms I-129 L-1 with an average of (2.34   +/- 1.43) x 10(9) atoms I-129 L-1, and the annual deposition flux of   I-129 is (1.25 +/- 0.30) x 10(12) atoms m(-2). increased I-129 levels   in precipitation and I-129/I-127 ratio are attributed to the releases   of I-129 from the reprocessing plants at La Hague and Sellafield.   Iodide is the major specie of I-129, which accounts for 50-99% of tote   I-129. The concentrations of total I-129 vary from 0.78 to 2.70 mu g   iodine L-1 with an average of 1.63 +/- 0.47 mu g iodine L-1, and annual   deposition flux of 0.95 +/- 0.26 mg m(-2). Unlike I-129, iodate is the   major specie of I-127, which accounts for 43-93% of total I-127. The   I-129/I-127 atomic ratios for total iodine vary from 5.04 to 76.5 x   10(-8) with an average of (30.1 +/- 16.8) x 10(-8). These values are 10   times lower for iodate with an average of (2.95 +/- 3.13) x 10-8.   Seasonal variations of I-129/I-127 values and I-129 concentrations are   associated with highs in spring and lows in summer-autumn periods. Re-emission of I-129 from the surface water of the English Channel,   Irish Sea, North Sea, and Norwegian Sea, especially from the European   continental coast areas, is evidently the major source of I-129 in the   precipitation, while stable I-127 in the precipitation has multiple   sources, i.e., marine, as well as terrestrial emission. This work shows   that data on speciation of iodine isotopes can provide thorough indications about the sources and geochemical cycle despite the   complicated atmospheric chemistry of iodine.

Place, publisher, year, edition, pages
2009. Vol. 43, no 17, 6522-6528 p.
National Category
Earth and Related Environmental Sciences Engineering and Technology
URN: urn:nbn:se:uu:diva-122043DOI: 10.1021/es9012678ISI: 000269258000018OAI: oai:DiVA.org:uu-122043DiVA: diva2:308341
Available from: 2010-04-06 Created: 2010-04-06 Last updated: 2016-04-14Bibliographically approved

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Possnert, Göran
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