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首页> 外文期刊>Environmental toxicology and chemistry >SILVER NANOPARTICLE TOXICITY TO DAPHNIA MAGNA IS A FUNCTION OF DISSOLVED SILVER CONCENTRATION
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SILVER NANOPARTICLE TOXICITY TO DAPHNIA MAGNA IS A FUNCTION OF DISSOLVED SILVER CONCENTRATION

机译：银纳米颗粒对水蚤的毒性，是溶解银浓度的一种功能

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摘要

The most persistent question regarding the toxicity of silver nanoparticles (AgNPs) is whether this toxicity is due to the nanoparticles themselves or the silver ions (Ag~+) they release. The present study investigates the role of surface coating and the presence of dissolved organic carbon on the toxicity of AgNPs to Daphnia magna and tests the hypothesis that the acute toxicity of AgNPs is a function of dissolved Ag produced by nanoparticle dissolution. Toxicity of silver nitrate (AgNO_3) and AgNPs with surface coatings-gum arabic (AgGA), polyethylene glycol (AgPEG), and polyvinylpyrrolidone (AgPVP)-at 48 h was assessed in US Environmental Protection Agency moderately hard reconstituted water alone and augmented with Suwannee River dissolved organic carbon (DOC). As expected, AgNO_3 was the most toxic to D. magna and AgPVPs were the least toxic. In general, Suwannee River DOC presence reduced the toxicity of AgNO_3, AgGAs, and AgPEG, while the toxicity of AgPVPs was unaffected. The measured dissolved Ag concentrations for all AgNPs and AgNO_3 at the 48-h median lethal concentration in moderately hard reconstituted water were similar. The presence of Suwannee River DOC decreased the ratio of measured dissolved Ag to measured total Ag concentration. These results support the hypothesis that toxicity of AgNPs to D. magna is a function of dissolved Ag concentration from these particles.
机译：关于银纳米颗粒（AgNPs）毒性的最持久的问题是这种毒性是由于纳米颗粒本身还是由于它们释放的银离子（Ag〜+）。本研究调查了表面涂层的作用和溶解的有机碳的存在对AgNPs对大型蚤的毒性，并检验了AgNPs的急性毒性是由纳米颗粒溶解产生的溶解Ag的功能的假设。在美国环境保护署评估了48小时硝酸银（AgNO_3）和AgNPs的表面涂层-阿拉伯胶（AgGA），聚乙二醇（AgPEG）和聚乙烯吡咯烷酮（AgPVP）的毒性。河流溶解的有机碳（DOC）。不出所料，AgNO_3对D. magna的毒性最大，而AgPVP的毒性最小。通常，Suwannee River DOC的存在会降低AgNO_3，AgGAs和AgPEG的毒性，而AgPVPs的毒性不受影响。在中等硬度的再生水中，在48小时中值致死浓度下，所有AgNPs和AgNO_3的溶解Ag浓度测量值相似。 Suwannee River DOC的存在降低了测得的溶解Ag与测得的总Ag浓度之比。这些结果支持了以下假设：AgNPs对D. magna的毒性是这些颗粒中溶解的Ag浓度的函数。

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  • 来源
    《Environmental toxicology and chemistry》 |2013年第10期|2356-2364|共9页
  • 作者

    Kim M. Newton; Hema L. Puppala; Christopher L. Kitchens; Vicki L. Colvin; Stephen J. Klaine;

  • 作者单位

    Clemson University Institute of Environmental Toxicology, Pendleton, South Carolina, USA,Clemson Graduate Program in Environmental Toxicology, Clemson University, Clemson, South Carolina, USA;

    Department of Chemistry, Rice University, Houston, Texas, USA;

    Department of Chemical and Biomolecular Engineering, Clemson University, Clemson, South Carolina, USA;

    Department of Chemistry, Rice University, Houston, Texas, USA;

    Clemson University Institute of Environmental Toxicology, Pendleton, South Carolina, USA,Department of Biological Sciences, Clemson University, Clemson, South Carolina, USA;

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

    Silver nanoparticle; Daphnia magna; Dissolved silver toxicity; Dissolved organic carbon; Surface coating;

    机译：银纳米粒子;水蚤溶解银的毒性;溶解的有机碳;表面涂层;

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