Zinc Oxide Nanomaterial Toxicity Effects on Growth and Accumulation of the Lemna perpusilla Torr. and Vallisneria natans (Lour.) H. Hara

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Research article

Journal of the Korean Society for Environmental Analysis 2017;20(4):193-199.

수생식물에서 산화아연 나노물질의 축적성 평가

조은혜, 성화경, 김은정, 유선경, 이재우, 김경태, 신유진, 김지은, 박선영, 엄익춘

국립환경과학원

Abstract

Toxicity effect and bioaccumulation of zinc oxide nanomaterials (ZnO NPs) were investigated in the aquatic plants Lemna perpusilla Torr. and Vallisneria natans (Lour.) H. Hara, exposed over 14 days to 0, 0.5, and 5 mg/L of ZnO NPs. Growth inhibition was demonstrated by decreases in leaf length, root length, and leaf number in Lemna perpusilla Torr. but was not significant. Analysis of the zinc concentration using ICP-MS showed that the ZnO NPs in the water at the beginning of exposure moved into the soil over time. The concentration of zinc that remained constant in the soil indicated the accumulation potential. The concentration of zinc in Vallisneria natans (Lour.) H. Hara leaves and Lemna perpusilla Torr. was significantly increased in a time-dependent manner. The zinc content in the biofilm was increased by over 10 times as compared with the control. Overall, ZnO NPs caused an accumulation effect on aquatic plants, and that may represent a potential source of toxicity and a risk for the aquatic ecosystem.

Key Words: Zinc oxide nanomaterials, Aquatic plant, Toxicity, Accumulation