Time Series of I-129 and I-127 Speciation in Precipitation from Denmark

Xiaolin Hou, Ala Aldahan, Sven Poul Nielsen, Göran Possnert

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    Abstract

    Environmental 129I mainly released from reprocessing plants at La Hague (France) and Sellafield (UK) provides a unique atmospheric and environmental tracer. This study deals with 129I and 127I speciation in precipitation collected in Denmark during 2001−2006 that indicates many new findings. The concentrations of total 129I in precipitation vary from 0.28 to 5.63 × 109 atoms 129I L−1 with an average of (2.34 ± 1.43) × 109 atoms 129I L−1, and the annual deposition flux of 129I is (1.25 ± 0.30) × 1012 atoms m−2. Increased 129I levels in precipitation and 129I/127I ratio are attributed to the releases of 129I from the reprocessing plants at La Hague and Sellafield. Iodide is the major specie of 129I, which accounts for 50−99% of total 129I. The concentrations of total 127I vary from 0.78 to 2.70 μg iodine L−1 with an average of 1.63 ± 0.47 μg iodine L−1, and annual deposition flux of 0.95 ± 0.26 mg m−2. Unlike 129I, iodate is the major specie of 127I, which accounts for 43−93% of total 127I. The 129I/127I atomic ratios for total iodine vary from 5.04 to 76.5 × 10−8 with an average of (30.1 ± 16.8) × 10−8. These values are 10 times lower for iodate with an average of (2.95 ± 3.13) × 10−8. Seasonal variations of 129I/127I values and 129I concentrations are associated with highs in spring and lows in summer−autumn periods. Re-emission of 129I 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 129I in the precipitation, while stable 127I 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.
    Original languageEnglish
    JournalEnvironmental Science & Technology (Washington)
    Volume43
    Issue number17
    Pages (from-to)6522-6528
    ISSN0013-936X
    DOIs
    Publication statusPublished - 2009

    Keywords

    • Radioecology and tracer studies
    • Nuclear technologies

    Cite this

    @article{bd4a460344cb484694b395193bf773f5,
    title = "Time Series of I-129 and I-127 Speciation in Precipitation from Denmark",
    abstract = "Environmental 129I mainly released from reprocessing plants at La Hague (France) and Sellafield (UK) provides a unique atmospheric and environmental tracer. This study deals with 129I and 127I speciation in precipitation collected in Denmark during 2001−2006 that indicates many new findings. The concentrations of total 129I in precipitation vary from 0.28 to 5.63 × 109 atoms 129I L−1 with an average of (2.34 ± 1.43) × 109 atoms 129I L−1, and the annual deposition flux of 129I is (1.25 ± 0.30) × 1012 atoms m−2. Increased 129I levels in precipitation and 129I/127I ratio are attributed to the releases of 129I from the reprocessing plants at La Hague and Sellafield. Iodide is the major specie of 129I, which accounts for 50−99{\%} of total 129I. The concentrations of total 127I vary from 0.78 to 2.70 μg iodine L−1 with an average of 1.63 ± 0.47 μg iodine L−1, and annual deposition flux of 0.95 ± 0.26 mg m−2. Unlike 129I, iodate is the major specie of 127I, which accounts for 43−93{\%} of total 127I. The 129I/127I atomic ratios for total iodine vary from 5.04 to 76.5 × 10−8 with an average of (30.1 ± 16.8) × 10−8. These values are 10 times lower for iodate with an average of (2.95 ± 3.13) × 10−8. Seasonal variations of 129I/127I values and 129I concentrations are associated with highs in spring and lows in summer−autumn periods. Re-emission of 129I 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 129I in the precipitation, while stable 127I 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.",
    keywords = "Radioecology and tracer studies, Nuclear technologies, Radio{\o}kologi og sporstofstudier, Nukleare teknologier",
    author = "Xiaolin Hou and Ala Aldahan and Nielsen, {Sven Poul} and G{\"o}ran Possnert",
    year = "2009",
    doi = "10.1021/es9012678",
    language = "English",
    volume = "43",
    pages = "6522--6528",
    journal = "Environmental Science & Technology (Washington)",
    issn = "0013-936X",
    publisher = "American Chemical Society",
    number = "17",

    }

    Time Series of I-129 and I-127 Speciation in Precipitation from Denmark. / Hou, Xiaolin; Aldahan, Ala; Nielsen, Sven Poul; Possnert, Göran.

    In: Environmental Science & Technology (Washington), Vol. 43, No. 17, 2009, p. 6522-6528.

    Research output: Contribution to journalJournal articleResearchpeer-review

    TY - JOUR

    T1 - Time Series of I-129 and I-127 Speciation in Precipitation from Denmark

    AU - Hou, Xiaolin

    AU - Aldahan, Ala

    AU - Nielsen, Sven Poul

    AU - Possnert, Göran

    PY - 2009

    Y1 - 2009

    N2 - Environmental 129I mainly released from reprocessing plants at La Hague (France) and Sellafield (UK) provides a unique atmospheric and environmental tracer. This study deals with 129I and 127I speciation in precipitation collected in Denmark during 2001−2006 that indicates many new findings. The concentrations of total 129I in precipitation vary from 0.28 to 5.63 × 109 atoms 129I L−1 with an average of (2.34 ± 1.43) × 109 atoms 129I L−1, and the annual deposition flux of 129I is (1.25 ± 0.30) × 1012 atoms m−2. Increased 129I levels in precipitation and 129I/127I ratio are attributed to the releases of 129I from the reprocessing plants at La Hague and Sellafield. Iodide is the major specie of 129I, which accounts for 50−99% of total 129I. The concentrations of total 127I vary from 0.78 to 2.70 μg iodine L−1 with an average of 1.63 ± 0.47 μg iodine L−1, and annual deposition flux of 0.95 ± 0.26 mg m−2. Unlike 129I, iodate is the major specie of 127I, which accounts for 43−93% of total 127I. The 129I/127I atomic ratios for total iodine vary from 5.04 to 76.5 × 10−8 with an average of (30.1 ± 16.8) × 10−8. These values are 10 times lower for iodate with an average of (2.95 ± 3.13) × 10−8. Seasonal variations of 129I/127I values and 129I concentrations are associated with highs in spring and lows in summer−autumn periods. Re-emission of 129I 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 129I in the precipitation, while stable 127I 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.

    AB - Environmental 129I mainly released from reprocessing plants at La Hague (France) and Sellafield (UK) provides a unique atmospheric and environmental tracer. This study deals with 129I and 127I speciation in precipitation collected in Denmark during 2001−2006 that indicates many new findings. The concentrations of total 129I in precipitation vary from 0.28 to 5.63 × 109 atoms 129I L−1 with an average of (2.34 ± 1.43) × 109 atoms 129I L−1, and the annual deposition flux of 129I is (1.25 ± 0.30) × 1012 atoms m−2. Increased 129I levels in precipitation and 129I/127I ratio are attributed to the releases of 129I from the reprocessing plants at La Hague and Sellafield. Iodide is the major specie of 129I, which accounts for 50−99% of total 129I. The concentrations of total 127I vary from 0.78 to 2.70 μg iodine L−1 with an average of 1.63 ± 0.47 μg iodine L−1, and annual deposition flux of 0.95 ± 0.26 mg m−2. Unlike 129I, iodate is the major specie of 127I, which accounts for 43−93% of total 127I. The 129I/127I atomic ratios for total iodine vary from 5.04 to 76.5 × 10−8 with an average of (30.1 ± 16.8) × 10−8. These values are 10 times lower for iodate with an average of (2.95 ± 3.13) × 10−8. Seasonal variations of 129I/127I values and 129I concentrations are associated with highs in spring and lows in summer−autumn periods. Re-emission of 129I 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 129I in the precipitation, while stable 127I 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.

    KW - Radioecology and tracer studies

    KW - Nuclear technologies

    KW - Radioøkologi og sporstofstudier

    KW - Nukleare teknologier

    U2 - 10.1021/es9012678

    DO - 10.1021/es9012678

    M3 - Journal article

    VL - 43

    SP - 6522

    EP - 6528

    JO - Environmental Science & Technology (Washington)

    JF - Environmental Science & Technology (Washington)

    SN - 0013-936X

    IS - 17

    ER -