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首页> 外文期刊>Environmental Science & Technology >Hosted and Free-Floating Metal-Bearing Atmospheric Nanoparticles in Mexico City
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Hosted and Free-Floating Metal-Bearing Atmospheric Nanoparticles in Mexico City

机译：墨西哥城托管和自由浮动的含金属大气纳米颗粒

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摘要

Nanoparticles (NPs) are ubiquitous in the atmosphere. Because of their small sizes, they can travel deeply into the lungs and other parts of the body. Many are highly reactive which, combined with their large surface areas, means they can seriously affect human health. Their occurrences in the atmosphere and their biological effects are not well-understood. We focus on NPs that were either free-floating or hosted within large aerosol particles (aerodynamic diameter 50-300 nm) and consist of or contain transition or post-transition metals (m-NPs). The samples were collected from ambient air above Mexico City (MC). We used transmission electron microscopy to measure their sizes and compositions. More than half of the 572 m-NPs that we analyzed contain two or more metals, and Fe, Pb, or Zn occurs in more than 60%. Hg occurs in 21% and is especially abundant in free-floating m-NPs. We find that m-NPs are common in polluted air such as in the MC area and, by inference, presumably other megacities The range and variety of compositions of m-NPs thatwe encountered, whether free-floating or hosted within larger aerosol particles, indicate the complicated occurrences that should be considered when evaluating the health effects of m-NPs in complex urban areas.
机译：纳米粒子（NPs）在大气中无处不在。由于它们的体积小，它们可以深入肺部和身体其他部位。许多具有高反应活性，再加上较大的表面积，意味着它们会严重影响人体健康。它们在大气中的发生及其生物学影响尚未得到很好的理解。我们关注的是自由漂浮或寄宿在较大的气溶胶颗粒（空气动力学直径为50-300 nm）中的NP，它们由过渡金属或过渡后金属（m-NP）组成或包含它们。样品是从墨西哥城（MC）上方的环境空气中收集的。我们使用透射电子显微镜来测量其尺寸和组成。在我们分析的572个m-NP中，有一半以上包含两种或两种以上金属，Fe，Pb或Zn的含量超过60％。汞的含量为21％，在自由漂浮的m-NP中含量尤其丰富。我们发现m-NP在污染空气中很常见，例如在MC地区，并且据推测可能是其他特大城市。我们遇到的m-NP的组成范围和种类，无论是自由漂浮的还是寄居在较大的气溶胶颗粒中，都表明在评估复杂城市地区m-NP的健康影响时应考虑的复杂事件。

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  • 来源
    《Environmental Science & Technology》 |2010年第7期|p.2299-2304|共6页
  • 作者

    KOUJI ADACHI; PETER R. BUSECK;

  • 作者单位

    School of Earth and Space Exploration & Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona, 85287;

    School of Earth and Space Exploration & Department of Chemistry and Biochemistry, Arizona State University, Tempe, Arizona, 85287;

  • 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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