Uptake, accumulation, and biotransformation of metal oxide nanoparticles by a marine suspension-feeder

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• 作者：Milka O. Montes^a ; ^b ; Shannon K. Hanna^a ; Hunter S. Lenihan^a ; Arturo A. Keller^a ; ^{keller@bren.ucsb.edu}
• 关键词：Nanomaterials ; CeO2 ; ZnO ; Marine fate and transport ; Bioaccumulation
• 刊名：Journal of Hazardous Materials
• 出版年：2012
• 期刊代码：50_03043894
• 类别：ce
• 出版时间：30 July, 2012
• 卷：225-226
• 期：Complete
• 页码：139-145
• 文件大小：1060 K

摘要

A growing body of evidence indicates that some engineered nanoparticles (ENPs) are toxic to organisms that perform important ecosystem services in terrestrial and aquatic ecosystems. However, toxicity can be influenced by the biotransformation of contaminants, including ENPs, as it may alter the fate and transport of these substances. In turn, fate and transport can influence their bioavailability. To understand how biotransformation influences the fate and transport of ENPs in marine ecosystems, we exposed suspension-feeding mussels, Mytilus galloprovincialis, to two common nano-metal oxides, CeO₂ and ZnO, over a range of concentrations from 1 mg L^鈭? to 10 mg L^鈭?, in a laboratory experiment. Mussels exposed to 10 mg L^鈭? accumulated 62 渭g g^鈭? of Ce and 880 渭g g^鈭? of Zn on a dry tissue basis but rejected 21,000 渭g g^鈭? for Ce and 63,000 渭g g^鈭? for Zn in pseudofeces. Scanning electron microscope evidence indicates CeO₂ remained as ENPs but ZnO did not after being rejected by the mussels. Mussels filtered most of the CeO₂ from the aqueous media, while a significant fraction of Zn remained in solution. Differences in ENP solubility affect ENP uptake, excretion, and accumulation in mussels. Our study highlights the potential role of marine suspension feeders in biotransformation of ENPs.