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Uptake of gold nanoparticles in an algae -- Daphnid food chain.

机译：藻类中的金纳米颗粒-达芙妮食物链的吸收

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摘要

Nanoparticle entry into the environment can result in deleterious effects to exposed organisms, disruption of ecological processes, and accumulation within the wood web. Gold nanoparticles (AuNPs), which are classified as zero-valent metals, are of significant interest due to their use in a variety of applications including electrical, biomedical, catalytic, magnetic, and optical technology. The wide range of uses for AuNPs can be attributed to a combination of the unique physical properties of the element gold (i.e. density, conductivity, stability, etc.) and the diversity of sizes, shapes, and surface compositions that can be achieved through manipulation of AuNP synthesis. While previous studies have suggested that AuNPs can be bioconcentrated and bioaccumulated, these studies do not indicate the effects of AuNPs characteristics on trophic transfer.;The objectives of this study were to (1) quantify the uptake and depuration of 4nm and 18nm gold spheres by D. magna; (2) quantify the uptake of 4nm and 18nm AuNPs by the algae, Selenastrum capricornutum ; (3) quantify the bioaccumulation of 4nm and 18nm AuNPs previously incorporated in algae; and (4) determine the bioconcentration factors (BCF) for 4nm and 18nm AuNps in Selenastrum capricornutum and D. magna and the bioaccumulation factors (BAF) for 4nm and 18nm AuNPs in D. magna. Bioconcentration factors for D. magna exposed to 4nm and 18nm AuNPs for 96hr were 6641 and 10207, respectively. Depuration followed first order kinetics for the D. magna exposed to 18 nm AuNPs with a rate of -0.67 mug Au/hr, however the slope for 4nm depuration was not found to be significantly different from 0. Bioconcentration factors for S. capricornutum exposed to 4nm and 18nm AuNPs for 96hr were 79.8 and 146.3, respectively. Bioaccumulation factors for D. magna exposed to 4nm and 18nm AuNPs for 96hr were 3.9 and 7.5, respectively. In conclusion these data indicate that uptake and depuration of AuNPs by D. magna is dependent on particle size with larger AuNPs exhibiting increased depuration and that AuNP depuration is incomplete over the duration of these experiments.
机译：纳米颗粒进入环境可能对暴露的生物造成有害影响，破坏生态过程，并在木网上积聚。金纳米颗粒（AuNPs）被归类为零价金属，由于它们在包括电气，生物医学，催化，磁性和光学技术在内的各种应用中的使用，引起了人们的极大兴趣。 AuNP的广泛用途可归因于元素金的独特物理特性（即密度，电导率，稳定性等）以及可通过操作获得的尺寸，形状和表面组成的多样性AuNP的合成。尽管先前的研究表明AuNPs可以被生物富集和生物富集，但这些研究并未表明AuNPs特性对营养传递的影响。;本研究的目的是（1）通过定量分析4nm和18nm金球的吸收和纯化。 D. magna; （2）量化藻类硒硒硒对4nm和18nm AuNPs的吸收； （3）量化先前掺入藻类的4nm和18nm AuNPs的生物积累； （4）确定长发硒和D. magna中4nm和18nm AuNps的生物富集因子（BCF），以及D. magna中4nm和18nm AuNPs的生物富集因子（BAF）。暴露于4nm和18nm AuNPs 96小时的D. magna的生物浓缩系数分别为6641和10207。暴露于18 nm AuNPs的D. magna的净化过程遵循一阶动力学，速率为-0.67杯金/小时，但是4nm净化过程的斜率并未发现与0显着不同。暴露于S. capricornutum的生物浓缩因子4nm和18nm AuNP的96hr分别为79.8和146.3。暴露于4nm和18nm AuNPs的D. magna的生物蓄积因子分别为3.9和7.5。总之，这些数据表明，D。magna对金纳米粒子的摄取和净化取决于颗粒大小，较大的金纳米粒子显示出更高的净化度，而金纳米粒子的净化在这些实验过程中是不完全的。

著录项

  • 作者

    Osborne-Koch, Matthew.;

  • 作者单位

    Clemson University.;

  • 授予单位 Clemson University.;
  • 学科 Environmental science.;Environmental health.
  • 学位 M.S.
  • 年度 2009
  • 页码 44 p.
  • 总页数 44
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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