Speciation of 129I in sea, lake and rain waters

Publication: Research - peer-reviewJournal article – Annual report year: 2012

  • Author: Lehto, Jukka

    University of Helsinki (FI), Department of Chemistry

  • Author: Räty, Tero

    University of Helsinki (FI), Department of Chemistry

  • Author: Hou, Xiaolin

    Radioecology and Tracer Studies, Center for Nuclear Technologies, Technical University of Denmark, Frederiksborgvej 399, 4000, Roskilde, Denmark

  • Author: Paatero, Jussi

    Finnish Meteorological Institute (FI)

  • Author: Aldahan, Ala

    Uppsala University

  • Author: Possnert, Göran

    Uppsala University

  • Author: Flinkman, Juha

    Finnish Environment Institute (FI)

  • Author: Kankaanpää, Harri

    Finnish Environment Institute (FI)

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Concentrations of the very long-lived fission product 129I and stable iodine (127I) in the Baltic Sea and lake and rain waters from Finland, were measured as well as their occurrence as iodide (I−) and iodate (IO3−). The highest concentrations of both 127I and 129I occurred in sea water, on average 11.1±4.3μg/l and 3.9±4.1×10−9 at/l. In rain and lake waters the concentration of 129I was more or less identical and almost one order of magnitude lower than in sea water. Based on these observations, and data from the literature, it is assumed that the source of 129I in lakes is precipitation and the major source in the Baltic Sea is the inflow of sea water from the North Sea through the Danish Straits. The concentration of 129I in the Baltic Sea has increased by a factor of six during ten years from 1999. In all studied water types the main chemical form of both iodine isotopes was iodide; in sea and lake waters by 92–96% and in rain water by 75–88%. Compared to 127I the fraction of iodide was slightly higher in case of 129I in all waters.
Original languageEnglish
JournalScience of the Total Environment
Publication date2012
CitationsWeb of Science® Times Cited: 6


  • Speciation, Sea water, Rain water, I-129, I-127, Lake water
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ID: 6618328