A review of the biological and geochemical behavior of technetium in the Marine environment |
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| Institution: | 1. Department of Environmental Engineering and Earth Sciences, Clemson University, 342 Computer Ct, Anderson, SC 29625, USA;2. Department of Environmental and Radiological Health Sciences, Colorado State University, 1681 Campus Delivery, Fort Collins, CO, 80523, USA;1. Centre for Environment, Fisheries and Aquaculture Science, Lowestoft NR33 0HT, United Kingdom;2. Food Standards Agency, London WC2B 6NH, United Kingdom;1. Instituto Nacional de Tecnología Agropecuaria (INTA), AER Guatraché, Las Heras 76, 6311, Guatraché, Argentina;2. INTA, Centro Regional La Pampa-San Luis, Av. Spinetto 785, 6300, Santa Rosa, Argentina;3. INTA, EEA Anguil, Ruta Nacional 5 km 580, 6326, Anguil, Argentina;4. Centro de Recursos Naturales Renovables de la Zona Semiárida (CERZOS), Departamento de Agronomía, Universidad Nacional del Sur (UNS)-CONICET, La carrindanga km 7, 8000, Bahía Blanca, Argentina;1. Vernadsky Institute of Geochemistry and Analytical Chemistry, Russian Academy of Sciences, 119991 Moscow, Russia;2. National Laboratory of Gran Sasso, INFN, I-67100 Assergi, Italy;3. Faculty of Mathematics, Physics and Informatics, Comenius University, 84248 Bratislava, Slovakia;1. Studiecentrum voor Kernenergie, Boeretang 200, B-2400 Mol, Belgium;2. Ecoles des mines de Nantes, Rue Alfred Kastler 4, Nantes 44300, France |
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| Abstract: | Present understanding of the behavior of Tc in the marine environment is summarized. The prevalent valence state of Tc in oxygenated seawater is +7, arguing that pertechnetate ion, TcO4−, represents the most likely form of this radioelement in seawater. Laboratory experiments using radiolabeled pertechnetate ion have shown that binding of this anion to different classes of marine sediments is slight. Concentration factors for the majority of marine organisms studied to date are small; notable exceptions are seen in certain species of brown algae, polychaetes and macrocrustaceans. Uptake and loss kinetics are generally rapid with the majority of the Tc being associated with shell, exoskeleton and gut. There are, as yet, no data supporting the contention that stable element analogs such as iodate can be used to predict the long-term behavior of 99Tc (as pertechnetate) in the marine environment. |
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