Document Detail

Trophic transfer of TiO(2) nanoparticles from Daphnia to zebrafish in a simplified freshwater food chain.
MedLine Citation:
PMID:  20371096     Owner:  NLM     Status:  MEDLINE    
The rapid development of nanotechnology and the corresponding increase in the use of manufactured nanomaterials (MNMs) in commercial products have led to concerns about the health risks and environmental impacts of such nanosized materials. One of the most significant and currently not well-understood risks is their potential transfer and magnification in food webs. To address this concern, a simplified model of a freshwater food chain including a low trophic level organism (daphnia, Daphnia magna) and a high trophic level organism (zebrafish, Danio rerio) was established. Our results provide the first direct evidence that nanoscale TiO(2) particles (nTiO(2)) can transfer from D. magna to D. rerio by dietary exposure. However, no biomagnifications of nTiO(2) was observed in this simplified food chain because the values of the biomagnification factors (BMF) in this study (0.024 and 0.009) were all less than one. Compared to the dietary intake, D. rerio could accumulate nTiO(2) by aqueous exposure with high bioaccumulation factors (BCFs) of 25.38 and 181.38 for 0.1 and 1.0mgL(-1) exposure groups, respectively. Nevertheless, higher body burden of nTiO(2) in the dietary exposure groups than that in the aqueous exposure groups demonstrated that dietary intake may constitute a major route of potential nanomaterial exposure for a higher trophic level of aquatic organisms. This study represents the first examination of the potential food chain transfer and biomagnification of nTiO(2) in an aquatic ecosystem.
Xiaoshan Zhu; Jiangxin Wang; Xuezhi Zhang; Yung Chang; Yongsheng Chen
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Publication Detail:
Type:  Journal Article; Research Support, U.S. Gov't, Non-P.H.S.     Date:  2010-04-03
Journal Detail:
Title:  Chemosphere     Volume:  79     ISSN:  1879-1298     ISO Abbreviation:  Chemosphere     Publication Date:  2010 May 
Date Detail:
Created Date:  2010-04-19     Completed Date:  2010-09-17     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0320657     Medline TA:  Chemosphere     Country:  England    
Other Details:
Languages:  eng     Pagination:  928-33     Citation Subset:  IM    
Copyright Information:
Copyright 2010 Elsevier Ltd. All rights reserved.
Department of Civil, Environmental, and Sustainable Engineering, Arizona State University, Tempe, AZ 85287, USA.
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MeSH Terms
Animal Feed
Daphnia / metabolism*
Environmental Exposure / adverse effects
Food Chain*
Fresh Water*
Oxygen / chemistry
Titanium / chemistry*,  metabolism*
Water / chemistry
Zebrafish / metabolism*
Reg. No./Substance:
13463-67-7/titanium dioxide; 7440-32-6/Titanium; 7732-18-5/Water; 7782-44-7/Oxygen

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