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Impact of Organic Carbon on the Stability and Toxicity of Fresh and Stored Silver Nanoparticles

机译：有机碳对新鲜和储存的银纳米颗粒的稳定性和毒性的影响

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摘要

Studies investigating the impact of particle size and capping agents on nanosilver toxicity in pristine laboratory conditions are becoming available. However, the relative importance of known environmental mitigating factors for dissolved silver remains poorly characterized for nanosilver in context with existing predictive toxicity models. This study investigated the implications of freshly prepared versus stored 20 and 100 nm nanosilver stocks to freshwater zooplankton (Ceriodaphnia dubia) in presence and absence of dissolved organic carbon (DOC). Results indicated that while the acute toxicity of nanosilver decreased significantly with larger size and higher DOC, storage resulted in significant increases in toxicity and ion release. The most dramatic decrease in toxicity due to DOC was observed for the 20 nm particle (2.5-6.7 fold decrease), with more modest toxicity reductions observed for the 100 nm particle (2.0-2.4 fold) and dissolved silver (2.7-3.1 fold). While a surface area dosimetry presented an improvement over mass when DOC was absent, the presence of DOC confounded its efficacy. The fraction of dissolved silver in the nanosilver suspensions was most predictive of acute toxicity regardless of system complexity. Biotic Ligand Model (BLM) predictions based on the dissolved fraction in nanosilver suspensions were comparable to observed toxicity.
机译：有关在原始实验室条件下研究粒度和封端剂对纳米银毒性的影响的研究正在获得。然而，在现有的预测毒性模型的背景下，对于纳米银而言，已知的环境缓解因子对于溶解银的相对重要性仍然无法很好地表征。这项研究调查了在存在和不存在溶解有机碳（DOC）的情况下，新鲜制备的以及储存的20和100 nm纳米银储备对淡水浮游动物（Ceriodaphnia dubia）的影响。结果表明，尽管纳米银的急性毒性随着尺寸的增大和DOC的增加而显着降低，但储存却导致毒性和离子释放的显着增加。对于20 nm颗粒，观察到由于DOC而引起的毒性下降最为明显（下降了2.5-6.7倍），而对于100 nm颗粒（2.0-2.4倍）和溶解的银（2.7-3.1倍），观察到的毒性下降幅度较小。 。当不使用DOC时，表面积剂量法比质量法有改善，但是DOC的存在使它的疗效感到困惑。纳米银悬浮液中溶解的银的分数最能预测急性毒性，而与系统的复杂性无关。基于纳米银悬浮液中溶解部分的生物配体模型（BLM）预测与观察到的毒性相当。

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  • 来源
    《Environmental Science & Technology》 |2012年第19期|p.10772-10780|共9页
  • 作者

    Alan J. Kennedy; Mark A. Chappell; Anthony J. Bednar; Adam C. Ryan; Jennifer G. Laird; Jacob K. Stanley; Jeffery A. Steevens;

  • 作者单位

    U.S. Army Engineer Research and Development Center, Environmental Laboratory, 3909 Halls Ferry Road, Vicksburg, Mississippi, United States;

    U.S. Army Engineer Research and Development Center, Environmental Laboratory, 3909 Halls Ferry Road, Vicksburg, Mississippi, United States;

    U.S. Army Engineer Research and Development Center, Environmental Laboratory, 3909 Halls Ferry Road, Vicksburg, Mississippi, United States;

    HDR | HydroQual, Syracuse, New York, United States;

    U.S. Army Engineer Research and Development Center, Environmental Laboratory, 3909 Halls Ferry Road, Vicksburg, Mississippi, United States;

    U.S. Army Engineer Research and Development Center, Environmental Laboratory, 3909 Halls Ferry Road, Vicksburg, Mississippi, United States;

    U.S. Army Engineer Research and Development Center, Environmental Laboratory, 3909 Halls Ferry Road, Vicksburg, Mississippi, 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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