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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

作者： Xu, Zhenlan 1 ; Tang, Tao 1 ; Cheng, Haixiang 2 ; Bao, Qibei 3 ; Yu, Jianzhong 1 ; Zhang, Changpeng 1 ; Wu, Tingting 2 ;

作者机构： 1.Zhejiang Acad Agr Sci, State Key Lab Qual & Safety Agroprod Prepared, Key Lab Pesticide Residue Detect, Minist Agr,Inst Qual & Stand Agroprod, Hangzhou 310021, Zhejiang, Peoples R China

2.Quzhou Univ, Coll Chem & Mat Engn, Dept Environm Engn, Quzhou 324000, Peoples R China

3.Ningbo Coll Hlth Sci, Ningbo 315100, Zhejiang, Peoples R China

4.Helmholtz Ctr Munich, Natl Res Ctr Environm Hlth GmbH, Mol EXposom MEX, Ingolstadter Landstr 1, D-85764 Neuherberg, Germany

5.Tech Univ Munich, Wissensch Zentrum Weihenstephan Ernahrung & Landn, Dept Biowissensch, Weihenstephaner Steig 23, D-85350 Freising Weihenstephan, Germany

6.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Environm Chem & Ecotoxicol, Beijing 100085, Peoples R China

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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