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首页> 外文期刊>Environmental toxicology and chemistry >EFFECT OF LIGHT ON TOXICITY OF NANOSILVER TO TETRAHYMENA PYRIFORMIS
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EFFECT OF LIGHT ON TOXICITY OF NANOSILVER TO TETRAHYMENA PYRIFORMIS

机译：光对纳米银对梨形眼膜炎的毒性作用

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摘要

More and more silver nanoparticles (AgNPs) have been released into the aquatic environment due to their widespread use, which may result in harmful effects on aquatic organisms. Environmental risk assessments of AgNPs on aquatic organisms in the natural environment (including light, sound, etc.) are indispensable. The aim of the present study was to elucidate the influence of light on the toxicity of AgNPs to Tetrahymena pyriformis. Silver nanoparticles, which were synthesized by reduction of silver nitrate with sodium borohydride, ranged in size from 5 to 20 nm with most particles approximately 10 nm. The authors performed AgNPs toxicity assays under a simulated natural environment with sunlight. The results indicated that the toxicity of AgNPs is higher than silver ion in the environment without light, but under the light condition, the toxicity of AgNPs decreased greatly. After 24 h of incubation with AgNPs, the inhibition ratio was 69.2 ± 7% in the dark and 35.5 ± 2% in the light, and the degree of inhibition was reduced by 33.7%. However, the effect of light on Ag~+ could be negligible. Further investigation indicated that the light irradiation could induce the growth of AgNPs and sequentially form bulk agglomeration. This decreased the surface area and the number of bare Ag atoms, resulting in a slower release rate and less Ag~+ ions released from AgNPs. At the same time, bulk agglomeration induced the deposition of part of the AgNPs to the aquatic bottom, which decreased the amount of AgNPs existing in water. All these phenomena led to the weakened toxicity of AgNPs in a light irradiation environment.
机译：由于它们的广泛使用，越来越多的银纳米颗粒（AgNPs）被释放到水生环境中，这可能对水生生物造成有害影响。对自然环境中的水生生物（包括光，声等）上的AgNP进行环境风险评估是必不可少的。本研究的目的是阐明光对AgNPs对梨形四膜虫的毒性的影响。通过用硼氢化钠还原硝酸银而合成的银纳米颗粒，尺寸为5至20 nm，大多数颗粒约为10 nm。作者在有阳光的模拟自然环境下进行了AgNPs毒性试验。结果表明，在没有光照的环境中，AgNPs的毒性高于银离子，但在光照条件下，AgNPs的毒性大大降低。用AgNPs孵育24小时后，在黑暗中的抑制率为69.2±7％，在黑暗中的抑制率为35.5±2％，抑制程度降低了33.7％。然而，光对Ag〜+的影响可以忽略不计。进一步的研究表明，光辐照可以诱导AgNPs的生长并依次形成本体团聚。这减少了表面积和裸露的Ag原子的数量，导致释放速度较慢，并且从AgNPs释放的Ag〜+离子更少。同时，大量团聚导致部分AgNPs沉积到水底，从而减少了水中存在的AgNPs的数量。所有这些现象导致AgNP在光照射环境中的毒性减弱。

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  • 来源
    《Environmental toxicology and chemistry》 |2012年第7期|p.1630-1638|共9页
  • 作者

    Jun-Peng Shi; Chun-Yan Ma; Bin Xu; Hong-Wu Zhang; Chang-Ping Yu;

  • 作者单位

    Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, China;

    Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, China;

    Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, China;

    Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, China;

    Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, China;

  • 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 nanoparticles; toxicity; light; tetrahymena pyriformis;

    机译：银纳米颗粒;毒性;光;梨形四膜虫;

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