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Speciation analysis of 129I, 137Cs, 232Th, 238U, 239Pu and 240Pu in environmental soil and sediment
Uppsala University, Disciplinary Domain of Science and Technology, Earth Sciences, Department of Earth Sciences, LUVAL.
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2012 (English)In: Applied Radiation and Isotopes, ISSN 0969-8043, E-ISSN 1872-9800, Vol. 70, no 8, 1698-1708 p.Article in journal (Refereed) Published
Abstract [en]

The environmental mobility and bioavailability of radionuclides are related to their physicochemical forms, namely species. We here present a speciation analysis of important radionuclides including I-129 (also I-127), Cs-137, Th-232, U-238 and plutonium isotopes (Pu-239 and Pu-240) in soil (IAEA-375) and sediment (NIST-4354) standard reference materials and two fresh sediment samples from Ovre Heimdalsvatnet Lake, Norway. A modified sequential extraction protocol was used for the speciation analysis of these samples to obtain fractionation information of target radionuclides. Analytical results reveal that the partitioning behaviour, and thus the potential mobility and bioavailability, are exclusively featured for the individual radionuclide. Iodine is relatively mobile and readily binds to organic matter, while plutonium is mainly bound to both organic matter and nitric acid leachable fractions. Thorium is predominated in nitric acid leachable fraction and caesium is primarily observed in nitric acid and aqua regia leachable fractions and residue. Our analytical results reveal that around 50% of uranium might still remain in the residue which could not be extracted with aggressive acid, namely, aqua regia.

Place, publisher, year, edition, pages
2012. Vol. 70, no 8, 1698-1708 p.
Keyword [en]
Sequential extraction, Soil, Sediment, Partitioning, Mobility, Bioavailability
National Category
Earth and Related Environmental Sciences
URN: urn:nbn:se:uu:diva-181869DOI: 10.1016/j.apradiso.2012.04.006ISI: 000307415800037OAI: oai:DiVA.org:uu-181869DiVA: diva2:557982
Available from: 2012-10-01 Created: 2012-10-01 Last updated: 2012-10-01Bibliographically approved

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Aldahan, AlaPossnert, Göran
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