کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
6362171 | 1622762 | 2010 | 12 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
Delineation of heavy metal contamination pathways (seawater, food and sediment) in tropical oysters from New Caledonia using radiotracer techniques
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
علوم زمین و سیارات
اقیانوس شناسی
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چکیده انگلیسی
Bioaccumulation of Ag, Cd, Co, Cr and Zn was studied in the oysters Isognomon isognomon and Malleus regula, using highly sensitive radiotracer techniques. Metals were readily bioconcentrated from the dissolved phase. Sediment exposures indicated a low bioavailability of sediment-bound metals (3-5 orders of magnitude lower than dissolved metals). In both seawater and sediment experiments, the two oysters displayed similar bioaccumulation behaviour towards all metals but Ag. Indeed, Ag was much more efficiently incorporated and retained in I. isognomon. Metals ingested with food (phytoplankton) were efficiently assimilated (34-77%) and strongly retained in oyster tissues (Tb½ ⩾ 20 d). Estimation of the relative contribution of each exposure pathway indicated that for both species sediment was the dominant pathway for Co and Cd, whereas food was the major source of Zn. Regarding Ag, seawater was the main source for I. isognomon (86%), whereas sediment was the predominant route for M. regula (92%).
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Marine Pollution Bulletin - Volume 61, Issues 7â12, 2010, Pages 542-553
Journal: Marine Pollution Bulletin - Volume 61, Issues 7â12, 2010, Pages 542-553
نویسندگان
Laetitia Hédouin, Marc Metian, Jean-Louis Teyssié, Renaud Fichez, Michel Warnau,