Effects and Implications of Trophic Transfer and Accumulation of CeO2 Nanoparticles in a Marine Mussel

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• 作者：Jon R. Conway ; Shannon K. Hanna ; Hunter S. Lenihan ; Arturo A. Keller
• 刊名：Environmental Science & Technology
• 出版年：2014
• 出版时间：February 4, 2014
• 年：2014
• 卷：48
• 期：3
• 页码：1517-1524
• 全文大小：321K
• ISSN：1520-5851

文摘

Bivalves are hypothesized to be key organisms in the fate and transport of engineered nanomaterials (ENMs) in aquatic environments due to their ability to filter and concentrate particles from water, but how different exposure pathways influence their interactions with ENMs is not well understood. In a five-week experiment, we tested how interactions between CeO₂ ENMs and a marine mussel, Mytilus galloprovincialis, are affected through two exposure methods, direct and through sorption to phytoplankton. We found that phytoplankton sorbed ENMs in <1 h. The exposure methods used did not result in significantly different mussel tissue or pseudofeces Ce concentrations. Approximately 99% of CeO₂ was captured and excreted in pseudofeces and average pseudofeces mass doubled in response to CeO₂ exposure. Final mean dry tissue Ce concentration (卤SE) for treatments exposed to 3 mg L^鈥? CeO₂ directly was 33 卤 9 渭g g^鈥? Ce, and 0 卤 0, 19 卤 4, 21 卤 3, and 28 卤 5 渭g g^鈥? for treatments exposed to 0, 1, 2, and 3 mg L^鈥? CeO₂ sorbed to phytoplankton. Clearance rates increased with CeO₂ concentration but decreased over time in groups exposed to CeO₂ directly, indicating stress. These results show the feedback between ENM toxicity and transport and the likelihood of biological mediation in the fate and transport of ENMs in aquatic environments.