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首页> 外文期刊>Environmental Science & Technology >Where Does the Transformation of Precipitated Ceria Nanoparticles in Hydroponic Plants Take Place?
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Where Does the Transformation of Precipitated Ceria Nanoparticles in Hydroponic Plants Take Place?

机译：水培植物中沉淀的二氧化铈纳米粒子在哪里发生转化？

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摘要

Cerium oxide nanoparticles (CeO_2 NPs) have been found to be partly biotransformed from Ce(Ⅳ) to Ce(Ⅲ) in plants, yet the transformation process and mechanism are not fully understood. Here, we try to clarify the specific site and necessary conditions for the transformation of precipitated CeO_2 NPs in hydroponic cucumber plants. Three different treatment modes were adopted according to whether the NPs were incubated with roots all the time or not. Results showed that exposure modes significantly affect the translocation and transformation of CeO_2 NPs. In the normal exposure mode, Ce was present as a Ce(Ⅳ) and Ce(Ⅲ) mixture in the roots and (hoots, and the proportion of Ce(Ⅲ) in the shoots was enhanced obviously with the increase of exposure time. The results of short-time incubation and petiole exposure modes suggested that CeO_2 NPs could not be reduced within a short incubation time (3 h) or be further reduced inside the plant tissues. It was deduced that root surfaces are the sites, and the physicochemkal interaction between the NPs and root exudates at the nanobio interface is the necessary condition for the transformation of CeO_2 NPs in plant systems, These results will contribute to understanding the transformation mechanism of CeO_2and other metal-based NPs and properly evaluate their ecological effects.
机译：已经发现氧化铈纳米颗粒（CeO_2 NPs）在植物中部分地从Ce（Ⅳ）转化为Ce（Ⅲ），但尚未完全了解其转化过程和机理。在这里，我们试图阐明在水培黄瓜植物中转化沉淀的CeO_2 NPs的具体位点和必要条件。根据NP是否一直与根一起温育，采用三种不同的处理方式。结果表明，暴露方式显着影响CeO_2 NPs的易位和转化。在正常暴露模式下，根和（蹄）的根中均以Ce（Ⅳ）和Ce（Ⅲ）的混合物形式存在Ce，并且随着暴露时间的增加，芽中Ce（Ⅲ）的比例也明显增加。短时温育和叶柄暴露方式的结果表明，CeO_2 NPs不能在短时温育（3 h）内还原或在植物组织内进一步还原，推测根表面是位点，其理化相互作用纳米生物界面上的NP与根系分泌物之间的转化是CeO_2 NP在植物系统中转化的必要条件，这些结果将有助于理解CeO_2和其他金属基NP的转化机理，并适当评估其生态效应。

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  • 来源
    《Environmental Science & Technology》 |2015年第17期|10667-10674|共8页
  • 作者

    Yuhui Ma; Peng Zhang; Zhiyong Zhang; Xiao He; Junzhe Zhang; Yayun Ding; Jing Zhang; Lirong Zheng; Zhi Guo; Lijuan Zhang; Zhifang Chai; Yuliang Zhao;

  • 作者单位

    Key Laboratory for Biological Effects of Nanomaterials and Nanosafety, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China;

    Key Laboratory for Biological Effects of Nanomaterials and Nanosafety, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China;

    Key Laboratory for Biological Effects of Nanomaterials and Nanosafety, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China;

    Key Laboratory for Biological Effects of Nanomaterials and Nanosafety, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China;

    Key Laboratory for Biological Effects of Nanomaterials and Nanosafety, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China;

    Key Laboratory for Biological Effects of Nanomaterials and Nanosafety, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China;

    Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China;

    Beijing Synchrotron Radiation Facility, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China;

    Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201204, China;

    Shanghai Synchrotron Radiation Facility, Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai 201204, China;

    Key Laboratory for Biological Effects of Nanomaterials and Nanosafety, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China;

    Key Laboratory for Biological Effects of Nanomaterials and Nanosafety, Institute of High Energy Physics, Chinese Academy of Sciences, Beijing 100049, China;

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