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KMID : 1156220170430030194
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Journal of Environmental Health Sciences
2017 Volume.43 No. 3 p.194 ~ p.201
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Fate and Bioaccumulation of Zinc Oxide Nanoparticles in a Microcosm
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Kim Eun-Jung
Lee Jae-Woo
Jo Eun-Hye
Sung Hwa-Kyung
Yoo Sun-Kyoung
Kim Kyung-Tae
Shin Yu-Jin
Kim Ji-Eun
Park Sun-Young
Eom Ig-Chun
Kim Pil-Je
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Abstract
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Objectives: Zinc oxide nanoparticles (ZnO NPs) are widely used in various commercial products, but they are exposed to the environment and can induce toxicity. In this study, we investigated the environmental fate and bioaccumulation of ZnO NPs in a microcosm.
Methods: The microcosm was composed of water, soil (Lufa Soil 2.2) and organisms (Oryzias latipes, Neocaridina denticulata, Semisulcospira libertina). Point five and 5 mg/L of ZnO NPs were exposed in the microcosm for 14 days. Total Zn concentrations were measured using an Inductively Coupled Plasma Mass Spectrometer (ICP-MS) and intracellular NPs were observed using Transmission Electron Microscopy (TEM).
Results: In the initial stages of exposure, the Zn concentrations in water increased in all exposure groups and then decreased, while the Zn concentration in soil increased after three hours for the 5 mg/L solution. Zn concentrations also showed increasing trends in N. denticulata and S. libertina at 0.5 and 5 mg/L, and in O. latipes at 5 mg/L. Accumulation of NPs was found in the livers of O. latipes and hepatopancreas of N. denticulata and S. libertina.
Conclusions: In the early stages of exposure, ZnO NPs remained in the water, and then were transported to the soil and test species. Unlike other species, total Zn concentrations in N. denticulata and S. libertina increased for both 0.5 mg/L and 5 mg/L. Therefore, ZnO NPs were more easily accumulated in zoobenthos than in fish.
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KEYWORD
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Zinc oxide, nanoparticles, microcosm
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