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首页> 外文期刊>Environmental Science & Technology >Effects and Implications of Trophic Transfer and Accumulation of CeO_2 Nanoparticles in a Marine Mussel
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Effects and Implications of Trophic Transfer and Accumulation of CeO_2 Nanoparticles in a Marine Mussel

机译：贻贝中营养转移和CeO_2纳米颗粒富集的影响及其意义

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摘要

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 CeO_2 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 CeO_2 was captured and excreted in pseudofeces and average pseudofeces mass doubled in response to CeO_2 exposure. Final mean dry tissue Ce concentration (±SE) for treatments exposed to 3 mg L~(-1) CeO_2 directly was 33 ± 9 μg g~(-1) Ce, and 0 ± 0, 19 ± 4, 21 ± 3, and 28 ± 5 μg g~(-1) for treatments exposed to 0, 1, 2, and 3 mg L~(-1) CeO_2 sorbed to phytoplankton. Clearance rates increased with CeO_2 concentration but decreased over time in groups exposed to CeO_2 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.
机译：由于双壳类动物具有过滤和浓缩水中颗粒的能力，因此被认为是工程纳米材料（ENM）在水生环境中的命运和运输中的关键生物，但人们尚不了解不同的暴露途径如何影响它们与ENM的相互作用。在一个为期五周的实验中，我们测试了CeO_2 ENM与海洋贻贝Mytilus galloprovincialis之间的相互作用如何通过两种暴露方法（直接和通过浮游植物的吸附）受到影响。我们发现浮游植物在不到1小时内就吸附了ENM。所使用的暴露方法并未导致贻贝组织或伪粪Ce浓度的显着不同。大约99％的CeO_2被捕获并以伪粪便排泄，并且平均伪粪便质量因CeO_2暴露而翻倍。直接暴露于3 mg L〜（-1）CeO_2的治疗的最终平均干组织Ce浓度（±SE）为33±9μgg〜（-1）Ce，0±0、19±4、21±3，在暴露于浮游植物的0、1、2和3 mg L〜（-1）CeO_2中，处理浓度为28±5μgg〜（-1）。清除率随CeO_2浓度的增加而增加，但随着时间的推移，直接暴露于CeO_2的组的清除率降低，表明存在压力。这些结果表明，在水生环境中，ENM的毒性和迁移以及在ENM的命运和迁移中进行生物介导的可能性之间存在反馈。

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  • 来源
    《Environmental Science & Technology》 |2014年第3期|1517-1524|共8页
  • 作者

    Jon R. Conway; Shannon K. Hanna; Hunter S. Lenihan; Arturo A. Keller;

  • 作者单位

    University of California Center for Environmental Implications of Nanotechnology, Bren School of Environmental Science and Management, University of California, Santa Barbara, California 93106, United States;

    University of California Center for Environmental Implications of Nanotechnology, Bren School of Environmental Science and Management, University of California, Santa Barbara, California 93106, United States;

    University of California Center for Environmental Implications of Nanotechnology, Bren School of Environmental Science and Management, University of California, Santa Barbara, California 93106, United States;

    University of California Center for Environmental Implications of Nanotechnology, Bren School of Environmental Science and Management, University of California, Santa Barbara, California 93106, United States;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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