...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Environmental Science & Technology >Highly Acidic Ambient Particles, Soluble Metals, and Oxidative Potential: A Link between Sulfate and Aerosol Toxicity
【24h】

Highly Acidic Ambient Particles, Soluble Metals, and Oxidative Potential: A Link between Sulfate and Aerosol Toxicity

机译：高酸性环境颗粒，可溶性金属和氧化电位：硫酸盐和气溶胶毒性之间的联系

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Soluble transition metals in particulate matter (PM) can generate reactive oxygen species in vivo by redox cycling, leading to oxidative stress and adverse health effects. Most metals, such as those from roadway traffic, are emitted in an insoluble form, but must be soluble for redox cycling. Here we present the mechanism of metals dissolution by highly acidic sulfate aerosol and the effect on particle oxidative potential (OP) through analysis of size distributions. Size-segregated ambient PM were collected from a road-side and representative urban site in Atlanta, GA Elemental and organic carbon, ions, total and water-soluble metals, and water-soluble OP were measured. Particle pH was determined with a thermodynamic model using measured ionic species. Sulfate was spatially uniform and found mainly in the fine mode, whereas total metals and mineral dust cations were highest at the road-side site and in the coarse mode, resulting in a fine mode pH < 2 and near neutral coarse mode. Soluble metals and OP peaked at the intersection of these modes demonstrating that sulfate plays a key role in producing highly acidic fine aerosols capable of dissolving primary transition metals that contribute to aerosol OP. Sulfate-driven metals dissolution may account for sulfate-health associations reported in past studies.
机译：颗粒物（PM）中的可溶性过渡金属可通过氧化还原循环在体内产生活性氧，从而导致氧化应激和不利的健康影响。大多数金属（例如来自道路交通的金属）以不溶形式释放，但对于氧化还原循环必须是可溶的。在这里，我们通过尺寸分布分析介绍了金属被高酸性硫酸盐气溶胶溶解的机理以及对颗粒氧化电位（OP）的影响。从佐治亚州亚特兰大的路边和代表性城市地点收集按尺寸分类的环境PM，并测量元素和有机碳，离子，总金属和水溶性金属以及水溶性OP。使用测得的离子种类通过热力学模型确定颗粒的pH。硫酸盐在空间上是均匀的，主要在精细模式下发现，而总金属和矿物粉尘阳离子在路边站点和粗糙模式下最高，导致精细模式下的pH <2和接近中性的粗糙模式。可溶性金属和OP在这些模式的交点处达到峰值，表明硫酸盐在生产能够溶解有助于气溶胶OP的主要过渡金属的高酸性精细气溶胶中起着关键作用。硫酸盐驱动的金属溶解可能是过去研究中报道的硫酸盐与健康的关联。

著录项

  • 来源
    《Environmental Science & Technology》 |2017年第5期|2611-2620|共10页
  • 作者

    Ting Fang; Hongyu Guo; Linghan Zeng; Vishal Verma; Athanasios Nenes; Rodney J. Weber;

  • 作者单位

    School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, Georgia 30332, United States;

    School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, Georgia 30332, United States;

    School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, Georgia 30332, United States;

    Department of Civil and Environmental Engineering, University of Illinois Urbana-Champaign, Champaign, Illinois 61801, United States;

    School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, Georgia 30332, United States ,School of Chemical and Biomolecular Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332, United States ,Iinstitute of Chemical Engineering Sciences, Foundation for Research and Technology, GR-26504, Patras, Greece ,Institute for Environmental Research and Sustainable Development, National Observatory of Athens, GR-15236, Palea Penteli, Greece;

    School of Earth and Atmospheric Sciences, Georgia Institute of Technology, Atlanta, Georgia 30332, 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);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号