Effect of surface coating and organic matter on the uptake of CeO2 NPs by corn plants grown in soil: Insight into the uptake mechanism

JOURNAL OF HAZARDOUS MATERIALS

卷:225

Article

Zhao, Lijuan¹  Peralta-Videa, Jose R.¹  Varela-Ramirez, Armando³  Castillo-Michel, Hiram⁴  Li, Chunqiang⁵  Zhang, Jianying³  Aguilera, Renato J.³  Keller, Arturo A.⁶  Gardea-Torresdey, Jorge L.^1,2 

[1] Univ Texas El Paso, Dept Chem, El Paso, TX 79968 USA

[2] Univ Texas El Paso, Environm Sci & Engn PhD Program, El Paso, TX 79968 USA

[3] Univ Texas El Paso, Dept Biol Sci, Border Biomed Res Ctr, El Paso, TX 79968 USA

[4] European Synchrotron Radiat Facil, F-38043 Grenoble, France

[5] Univ Texas El Paso, Dept Phys, El Paso, TX 79968 USA

[6] Univ Calif Santa Barbara, Bren Sch Environm Sci & Management, UC Ctr Environm Implicat Nanotechnol, Santa Barbara, CA 93106 USA

关键词: CeO2 NPs;    Root uptake;    Translocation;    Fluorescence;    Zea mays;   

DOI  :  10.1016/j.jhazmat.2012.05.008

来源: Elsevier

【 摘 要 】

Little is known about the fate, transport, and bioavailability of CeO2 nanoparticles (NPs) in soil. Moreover, there are no reports on the effect of surface coating upon NPs uptake by plants. In this study. Zen mays plants were grown for one month in unenriched and organic soils treated with coated and uncoated CeO2 NPs. In addition, plants were exposed to fluorescein isothiocyanate (FITC)-stained CeO2 NPs and analyzed in a confocal microscope. In organic soil, roots from uncoated and coated NPs at 100, 200, 400, and 800 mg kg(-1) had 40, 80, 130, and 260% and 10, 70, 90, and 40% more Ce, respectively, compared to roots from unenrichecl soil. Conversely, shoots of plants from unenriched soil had significantly more Ce compared with shoots from organic soil. Confocal fluorescence images showed FITC-stained CeO2 NP aggregates in cell walls of epidermis and cortex, suggesting apoplastic pathway. The mu XRF results revealed the presence of CeO2 NP aggregates within vascular tissues. To the authors knowledge this is the first report on the effects of surface coating and organic matter on Ce uptake from CeO2 NPs and upon the mechanisms of CeO2 NPs uptake by higher plants. (C) 2012 Elsevier B.V. All rights reserved.

【 授权许可】

Free