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首页> 外文期刊>Environmental Science & Technology >Uptake, Distribution, and Transformation of Zerovalent Iron Nanoparticles in the Edible Plant Cucumis sativus
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Uptake, Distribution, and Transformation of Zerovalent Iron Nanoparticles in the Edible Plant Cucumis sativus

机译：食用植物黄瓜中零价铁纳米颗粒的吸收，分布和转化

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摘要

Here, we investigated the fate of nanoscale zerovalent iron (nZVI) on the Cucumis sativus under both hydroponic and soil conditions. Seedlings were exposed to 0, 250, and 1000 mg/L (or mg/kg soil) nZVI during 6-9 weeks of a growth period. Ionic controls were prepared using Fe-EDTA. None of the nZVI treatments affected the plant biomass. On the basis of the total iron contents and the superparamagnetic property of nZVI-exposed roots, there was no evidence of pristine nZVI translocation from the roots to shoots. Electron microscopy revealed that the transformed iron nanoparticles are stored in the root cell membrane and the vacuoles of the leaf parenchymal cells. X-ray absorption spectroscopy identified ferric citrate (41%) and iron (oxyhydr)oxides (59%) as the main transformed products in the roots. The shoot samples indicated a larger proportion of ferric citrate (60%) compared to iron (oxyhydr)oxides (40%). The 1.8-fold higher expression of the CsHA1 gene indicated that the plant-promoted transformation of nZVI was driven by protons released from the root layers. The current data provide a basis for two potential nZVI transformation pathways in Cucumis sativus: (1) interaction with low molecular weight organic acid ligands and (2) dissolution-precipitation of the mineral products.
机译：在这里，我们研究了在水培和土壤条件下黄瓜中的纳米级零价铁（nZVI）的命运。在生长期的6-9周内，将幼苗暴露于0、250和1000 mg / L（或mg / kg土壤）nZVI。使用Fe-EDTA制备离子对照。 nZVI处理均未影响植物生物量。根据暴露于nZVI的根的总铁含量和超顺磁性，没有证据表明原始nZVI从根到芽的易位。电子显微镜显示，转化的铁纳米颗粒储存在根细胞膜和叶片实质细胞的液泡中。 X射线吸收光谱法鉴定出柠檬酸铁（41％）和氧化铁（羟基氧化物）（59％）是根中的主要转化产物。芽样品显示柠檬酸铁（60％）比氧化铁（40％）更大。 CsHA1基因的1.8倍高表达表明nZVI的植物促进转化是由从根层释放的质子驱动的。当前数据为黄瓜中两个潜在的nZVI转化途径提供了基础：（1）与低分子量有机酸配体的相互作用以及（2）矿物质的溶解沉淀。

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  • 来源
    《Environmental Science & Technology》 |2018年第17期|10057-10066|共10页
  • 作者

    Dwivedi Amarendra Dhar; Yoon Hakwon; Singh Jitendra Pal; Chae Keun Hwa; Rho Sang-chul; Hwang Dong Soo; Chang Yoon-Seok;

  • 作者单位

    Pohang Univ Sci & Technol POSTECH, Div Environm Sci & Engn, Pohang 37673, South Korea;

    Pohang Univ Sci & Technol POSTECH, Div Environm Sci & Engn, Pohang 37673, South Korea;

    Korea Inst Sci & Technol, Adv Anal Ctr, Seoul 02792, South Korea;

    Korea Inst Sci & Technol, Adv Anal Ctr, Seoul 02792, South Korea;

    Pohang Univ Sci & Technol POSTECH, Div Environm Sci & Engn, Pohang 37673, South Korea;

    Pohang Univ Sci & Technol POSTECH, Div Environm Sci & Engn, Pohang 37673, South Korea;

    Pohang Univ Sci & Technol POSTECH, Div Environm Sci & Engn, Pohang 37673, South Korea;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
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