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Arsenate accumulation, distribution, and toxicity associated with titanium dioxide nanoparticles in Daphnia magna Mengting Li, Zhuanxi Luo, Yameng Yan, Zhenhong Wang, Qiaoqiao Chi, Changzhou Yan, and Baoshan Xing Environ. Sci. Technol., Just Accepted Manuscript • DOI: 10.1021/acs.est.6b01215 • Publication Date (Web): 02 Aug 2016 Downloaded from http://pubs.acs.org on August 7, 2016
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Graphical Abstract
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Arsenate accumulation, distribution, and toxicity associated with titanium dioxide nanoparticles in Daphnia magna
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Mengting Li1,3, Zhuanxi Luo1,2*, Yameng Yan1, Zhenhong Wang1,2, Qiaoqiao Chi1, Changzhou Yan1,*, Baoshan Xing2
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Chinese Academy of Sciences, Xiamen 361021, China
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Massachusetts 01003, United States
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Key Laboratory of Urban Environment and Health, Institute of Urban Environment,
Stockbridge
School
of
Agriculture,
University
of
Massachusetts,
Amherst,
University of Chinese Academy of Sciences, Beijing 100049, China
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ABSTRACT: Titanium dioxide nanoparticles (nano-TiO2) are widely used in consumer
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products. Nano-TiO2 dispersion could, however, interact with metals and modify their
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behavior and bioavailability in aquatic environments. In this study, we characterized and
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examined arsenate (As(V)) accumulation, distribution, and toxicity in Daphnia magna in
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the presence of nano-TiO2. Nano-TiO2 acts as a positive carrier, significantly facilitating
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D. magna’s ability to uptake As(V). As nano-TiO2 concentrations increased from 2 to 20
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mg-Ti/L, total As increased by a factor of 2.3 to 9.8 compared to the uptake from the
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dissolved phase. This is also supported by significant correlations between arsenic (As)
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and titanium (Ti) signal intensities at concentrations of 2.0 mg-Ti/L nano-TiO2 (R=0.676,
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