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首页> 外文期刊>Environmental Science & Technology >Effect of Direct Contact on the Phytotoxicity of Silver Nanomaterials
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Effect of Direct Contact on the Phytotoxicity of Silver Nanomaterials

机译：直接接触对银纳米材料植物毒性的影响

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摘要

The increasing use of silver nanomaterials (AgNMs) in consumer products will result in an increased amount entering the environment, where AgNMs were recently found to cause phytotoxicity in the model plant Lolium multiflorum. To better understand the causes of the phytotoxicity, we have designed a new set of experiments to study the effect of AgNM dissolution. Dissolution of AgNMs was measured over a 1-month period to determine if dissolution alone caused phytotoxicity. Very little dissolution was observed over the testing period, suggesting a different mechanism caused the majority of the toxicity. To further confirm this hypothesis, AgNMs were physically separated from the seeds and plants by a dialysis membrane. Toxicity was ameliorated in AgNM-exposed plants, showing that direct contact between AgNMs and plant seeds/roots is a required condition for the observed phytotoxicity in plant models. Probing further, a surface reactivity assay showed increased surface reactivity of silver nanoparticles (AgNPs) and silver nanocubes (AgNCs) corresponded to increased toxicity compared to silver nanowires (AgNWs). The work here can help build the knowledge base regarding shape control of nanomaterials and reducing unintended side effects.
机译：消费产品中银纳米材料（AgNMs）的越来越多的使用将导致进入环境的数量增加，最近发现该环境中的AgNMs对模型植物多花黑麦草具有植物毒性。为了更好地了解植物毒性的原因，我们设计了一组新的实验来研究AgNM溶解的影响。在1个月的时间内测量了AgNMs的溶出度，以确定仅溶出度是否会引起植物毒性。在测试期间几乎没有观察到溶解，表明大多数的毒性是由不同的机理引起的。为了进一步证实这一假设，通过透析膜将AgNMs从种子和植物中物理分离出来。暴露于AgNM的植物的毒性有所改善，表明AgNM与植物种子/根的直接接触是在植物模型中观察到的植物毒性的必要条件。进一步探测，表面反应性测定显示，与银纳米线（AgNWs）相比，银纳米颗粒（AgNPs）和银纳米立方体（AgNCs）的表面反应性增加，相应于毒性增加。此处的工作可以帮助建立有关纳米材料形状控制和减少意外副作用的知识库。

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  • 来源
    《Environmental Science & Technology》 |2016年第19期|10370-10376|共7页
  • 作者

    Danielle E. Gorka; Jie Liu;

  • 作者单位

    Center for the Environmental Implications of NanoTechnology (CEINT) Duke University, Durham, North Carolina 27708, United States,Department of Chemistry, Duke University, Durham, North Carolina 27708, United States;

    Center for the Environmental Implications of NanoTechnology (CEINT) Duke University, Durham, North Carolina 27708, United States,Department of Chemistry, Duke University, Durham, North Carolina 27708, United States;

  • 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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  • 正文语种 eng
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