Biokinetics of Americium-241 in the euryhaline diamond sturgeon Acipenser gueldenstaedtii following its uptake from water or food.

Autor: Jeffree RA; Jeffree Conservation & Research, 45 Casuarina Road, Alfords Point, 2234, Australia. Electronic address: ross.jeffree@outlook.com., Markich SJ; Aquatic Solutions International, North Arm Cove, NSW, 2324, Australia; School of Natural Sciences, Macquarie University, North Ryde, NSW, 2109, Australia., Oberhaensli F; Marine Radioecology Laboratory, IAEA Environment Laboratories, 4 Quai Antoine, MC 98000, Monaco., Teyssie JL; Le Franval, 298 Bd Marcel Pagnol, 06700, St Laurent du Var, France.
Jazyk: angličtina
Zdroj: Journal of environmental radioactivity [J Environ Radioact] 2024 Sep; Vol. 278, pp. 107503. Date of Electronic Publication: 2024 Jul 31.
DOI: 10.1016/j.jenvrad.2024.107503
Abstrakt: Americium-241 whole body and internal biokinetics were experimentally investigated in the euryhaline diamond sturgeon Acipenser gueldenstaedtii during its uptake from water and food, in fresh (FW) and brackish water (BW; 9 psu). Whole-body uptake rates of 241 Am from water and subsequent depuration rates were quantified over 14 and 28 days, respectively, and assimilation efficiency (AE) of 241 Am from diet (chironomid) was determined over 28 days. FW reduced the biological half-life of 241 Am following aqueous uptake by an order of magnitude. In contrast BW greatly reduced 241 Am assimilation efficiency (AE) from diet (chironomid) by several orders of magnitude (from an AE of 8.5% (FW) down to 0.003% (BW)). Hence, salinity per se is indicated as a major environmental variable in determining the radiological exposure of A. gueldenstaedtii to 241 Am. During aqueous exposure BW appreciably increased 241 Am activity concentrations in most body components, but aqueous or dietary exposure pathway at either salinity did not determine marked differences in how 241 Am was distributed among six body components. The highly mineralized skin of A. gueldenstaedtii recurred as a major repository of 241 Am in all experimental treatments, as high as 50% among body components, due to its internal transfer from diet, surface adsorption and/or active absorption from water. The indicated prominence of the aqueous, compared to the dietary, exposure pathway for 241 Am accumulation by A. gueldenstaedtii suggests its radiological exposure would be enhanced by BW as it leads to its greater long-term retention, due to a much longer biological half-life.
Competing Interests: Declaration of competing interest The authors have no competing interests to declare.
(Copyright © 2024 Elsevier Ltd. All rights reserved.)
Databáze: MEDLINE
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