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首页> 外文期刊>Journal of soils & sediments >Effect of individual and combined exposure of Fe_2O_3 nanoparticles and oxytetracycline on their bioaccumulation by rice (Oryza sativa L.)
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Effect of individual and combined exposure of Fe_2O_3 nanoparticles and oxytetracycline on their bioaccumulation by rice (Oryza sativa L.)

机译：Fe_2O_3纳米颗粒和氧赤素液体和催眠素对水稻生物累积的影响（Oryza sativa L.）的影响

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摘要

Purpose It has been reported the bioaccumulation of gamma-ferric oxide nanoparticles (Fe2O3 NPs) or oxytetracycline (OTC) in crops. However, there have been little references investigating their uptake and bioaccumulation in crops after the combined exposure. The present study focused on Fe2O3 NPs and OTC accumulation on root surface and in the tissues of rice (Oryza sativa L.) seedlings under combined exposure. And, the interactive influence mechanism was also discussed.Materials and methods Hydroponic experiments were conducted to investigate the Fe and OTC accumulation on root surface and in rice tissues under individual and combined exposure of Fe2O3 NPs and OTC. The dynamic change of particulate Fe, ionic Fe, and Fe plaque concentrations on root surface was determined under the influence of OTC from Fe2O3 NPs and Fe-EDTA exposure. Fe2+ from Fe-EDTA was selected in order to compare the Fe bioaccumulation from ionic Fe and nanoparticle Fe exposure. Hydrodynamic diameter and zeta-potential of Fe2O3 NPs in solution were investigated when OTC was present or not, and the changes of OTC concentrations were also determined during hydroponic culture. SEM, XRD, and TEM were used to analyze Fe2O3 NP distribution on root surface and inside root under the influence of OTC.Results and discussion OTC promoted surface-Fe and shoot-Fe accumulation in Fe2O3 NPs treatments, which was just an opposite result from Fe-EDTA treatments. Upon Fe2O3 NP exposure, Fe plaque was formed through the direct adsorption of NPs on the outside root surface and then incorporated into plaque as its crystalline components. OTC elevated notably surface-Fe accumulation mainly through increasing adsorption and precipitation of Fe2O3 NPs on the root surface due to low repulsive electrostatic interaction between NPs and the root surface after adding OTC. Fe2O3 NPs increased surface-OTC and root-OTC levels. Compared to Fe-EDTA, surface-Fe from NP treatments can hold strongly OTC due to Fe2O3 particle precipitated on root surface with high specific surface area. NPs reduced shoot-OTC under 25 mg L-1 OTC, but not under 100 mg L-1 OTC.Conclusions This study clearly demonstrates that Fe/OTC accumulation in rice was always in the order root surface shoot root, whether Fe2O3 NPs/OTC was individual or combined exposure. The combined exposure will increase their root surface distribution comparing with individual exposure, and Fe2O3 NPs increased also root-OTC levels, which could pose a potential risk to food safety in subsequent growth of rice.
机译：目的，已经报道了γ-氧化铁纳米颗粒（Fe 2 O 3 NPS）或羟基环菌（OTC）的生物累积。然而，在合并后，几乎没有参考作物的摄影和生物累积。本研究重点关注Fe2O3 NPS和OTC在组合暴露下的水稻（Oryza Sativa L.）幼苗的组织上积累。并且，还讨论了互动影响机制。进行了水培实验的材料和方法，以研究Fe2O3 NPS和OTC的个体和组织中的根表面和水稻组织中的Fe和OTC积累。在Fe2O3 NPS和Fe-EDTA暴露的影响下，测定了根表面上颗粒Fe，离子Fe和Fe斑块浓度的动态变化。选择来自Fe-EDTA的Fe2 +，以比较离子Fe和纳米粒子Fe暴露的Fe BioAccumulation。当存在OTC或不存在OTC时，研究了溶液中Fe2O3 NPS的流体动力直径和ζ电位，并且在水培培养过程中也测定OTC浓度的变化。 SEM，XRD和TEM用于分析OTC.Results和讨论OTC在FE2O3 NPS治疗中促进表面-FE和射击FE积聚的FE2O3 NP对根表面和内部根系的FE2O3 NP分布。 Fe-EDTA治疗。在Fe 2 O 3 NP暴露时，通过直接吸附外部根表面的NP形成Fe斑块，然后将其掺入斑块中作为其结晶组分。由于在加入OTC之后NPS和根表面之间的低排斥静电相互作用，由于NPS和根表面之间的低排斥静电相互作用，因此主要通过增加Fe2O3 NP的吸附和沉淀而升高了表面-Fe积累。 Fe2O3 NPS增加表面OTC和根间OTC水平。与Fe-EDTA相比，由于在具有高比表面积的根表面上沉淀出Fe 2 O 3颗粒，来自NP治疗的表面-F可以保持强烈的OTC。 NPS减少25 mg L-1 OTC下的OTC，但不在100mg L-1 OTC.Conclusions下，本研究清楚地表明，水稻中的Fe / OTC积累总是在秩序根表面>射击>根，是否FE2O3 NPS / OTC是个体或组合的暴露。结合的暴露将增加其与个体暴露的根表分布，并且Fe2O3 NPS也增加了根 - OTC水平，这可能会对水稻随后生长的食品安全构成潜在风险。

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  • 来源
    《Journal of soils & sediments》 |2019年第5期|2459-2471|共13页
  • 作者

    Bao Yanyu; Ma Chuanxin; Hu Lu; Xing Baoshan;

  • 作者单位

    Nankai Univ Coll Environm Sci & Engn Tianjin Key Lab Environm Remediat & Pollut Contro Key Lab Pollut Proc & Environm Criteria Minist Ed Tianjin 300350 Peoples R China|Univ Massachusetts Stockbridge Sch Agr Amherst MA 01003 USA;

    Univ Massachusetts Stockbridge Sch Agr Amherst MA 01003 USA|Connecticut Agr Expt Stn Dept Analyt Chem New Haven CT 06504 USA;

    Nankai Univ Coll Environm Sci & Engn Tianjin Key Lab Environm Remediat & Pollut Contro Key Lab Pollut Proc & Environm Criteria Minist Ed Tianjin 300350 Peoples R China;

    Univ Massachusetts Stockbridge Sch Agr Amherst MA 01003 USA;

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  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    gamma-Ferric oxide nanoparticles (Fe2O3 NPs); Oxytetracycline (OTC); Uptake; Bioaccumulation; Rice (Oryza sativa L);

    机译：γ-氧化铁纳米颗粒（Fe2O3 NPS）;氧赤素（OTC）;摄取;生物累积;米（Oryza Sativa L）;

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