Time series of I-129 and I-127 speciation in precipitation from Denmark
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
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.
Earth and Related Environmental Sciences Engineering and Technology
IdentifiersURN: urn:nbn:se:uu:diva-122043DOI: 10.1021/es9012678ISI: 000269258000018OAI: oai:DiVA.org:uu-122043DiVA: diva2:308341