Negligible effects of TiO2 nanoparticles at environmentally relevant concentrations on the translocation and accumulation of perfluorooctanoic acid and perfluorooctanesulfonate in hydroponically grown pumpkin seedlings (Cucurbita maxima x C. moschata)

文献类型： 外文期刊

第一作者： Xu, Zhenlan

作者： Xu, Zhenlan;Tang, Tao;Yu, Jianzhong;Zhang, Changpeng;Zhao, Xueping;Cheng, Haixiang;Wu, Tingting;Bao, Qibei;Schramm, Karl-Werner;Schramm, Karl-Werner;Wang, Yawei

作者机构：

关键词： TiO2 nanoparticles; Pumpkin seedling; Perfluoroalkyl substances; Uptake; Accumulation

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：7.963； 五年影响因子：7.842 ）

ISSN： 0048-9697

年卷期： 2019 年 686 卷

页码：

收录情况： SCI

摘要： Titanium dioxide nanopartides (TiO2-NPs) are widely distributed in the environment. It has been demonstrated that TiO2-NPs could modify the environmental fate and bioavailability of organic pollutants, which affects ecological risks of TiO2-NPs and organic pollutants. In this study, the uptake, translocation and accumulation of perfluorooctanoic acid (PFOA) and perfluorooclanesulfonate (PFOS) in pumpkin plants was investigated in the presence of TiO2-NPs. We reported for the first lime the negligible effects of TiO2-NPs al environmentally relevant concentrations (0.05-5 mg/L) on the uptake and accumulation of PFOA and PFOS in hydroponically grown pumpkin seedlings regardless of root, stem and leaf. This phenomenon was independent of the initial concentrations of PFOA/PFOS and TiO2-NPs in the exposure solution. Also, seedling mass and contents of chlorophyll and anthocyanin were not affected by the co-exposure. Adsorption tests demonstrated the negligible adsorption of PFOA/PFOS on TiO2-NPs in the exposure solution. Moreover, uptake of PFOA/PFOS was insensitive to aquaporin inhibitor AgNO3 but significantly inhibited by niflumic acid (anion channel blocker) and 2,4-d initrophenol (metabolic inhibitor) whereas Ti concentration in root was not affected by niflumic acid and 2,4-din itrophenol but significantly decreased by AgNO3, indicating that transport of PFOA/PFOS and TiO2-NPs were via different routes into the pumpkin seedling. It was proposed that different pathways by which TiO2-NPs and PFOA/PFOS transported into the pumpkin seedling and negligible adsorption of PFOA/PFOS on TiO2-NPs contributed to the negligible effects of TiO2-NPs on the uptake, translocation and accumulation of PFOA/PFOS in pumpkin seedlings. In total, this work would improve our understanding of the ecological risks of TiO2-NPs in the environment. (C) 2019 Published by Elsevier B.V.

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