...
首页> 外文期刊>Environmental Science & Technology >Insights on Chemistry of Mercury Species in Clouds over Northern China: Complexation and Adsorption
【24h】

Insights on Chemistry of Mercury Species in Clouds over Northern China: Complexation and Adsorption

机译:中国北方云中汞物种化学的见解:络合和吸附

获取原文
获取原文并翻译 | 示例
           

摘要

Cloud effects on heterogeneous reactions of atmospheric mercury (Hg) are poorly understood due to limited knowledge of cloudwater Hg chemistry. Here we quantified Hg species in cloudwater at the summit of Mt. Tai in northern China. Total mercury (THg) and methylmercury (MeHg) in cloudwater were on average 70.5 and 0.15 ng L~(–1), respectively, and particulate Hg (PHg) contributed two-thirds of THg. Chemical equilibrium modeling simulations suggested that Hg complexes by dissolved organic matter (DOM) dominated dissolved Hg (DHg) speciation, which was highly pH dependent. Hg concentrations and speciation were altered by cloud processing, during which significant positive correlations of PHg and MeHg with cloud droplet number concentration (N _(d)) were observed. Unlike direct contribution to PHg from cloud scavenging of aerosol particles, abiotic DHg methylation was the most likely source of MeHg. Hg adsorption coefficients K _(ad) (5.9–362.7 L g~(–1)) exhibited an inverse-power relationship with cloud residues content. Morphology analyses indicated that compared to mineral particles, fly ash particles could enhance Hg adsorption due to more abundant carbon binding sites on the surface. Severe particulate air pollution in northern China may bring substantial Hg into cloud droplets and impact atmospheric Hg geochemical cycling by aerosol–cloud interactions.
机译:由于对云水汞化学知识的了解有限,因此对云对大气汞(Hg)异质反应的影响了解甚少。在这里,我们量化了山顶的云水中的汞物种。中国北方的大。云水中的总汞(THg)和甲基汞(MeHg)分别平均为70.5和0.15 ng L〜(-1),颗粒汞(PHg)占THg的三分之二。化学平衡模型模拟表明,由溶解有机物(DOM)形成的Hg络合物主导了与pH高度相关的溶解Hg(DHg)形态。汞浓度和形态通过云处理而改变,在此期间观察到PHg和MeHg与云滴数浓度(N_(d))显着正相关。不同于气溶胶颗粒清除云对PHg的直接贡献,非生物DHg甲基化是MeHg最可能的来源。汞的吸附系数 K _(ad)(5.9-362.7 L g〜(-1))与云量有关。形态分析表明,与矿物颗粒相比,粉煤灰颗粒由于表面上更丰富的碳结合位点,可以增强汞的吸附。中国北方严重的颗粒空气污染可能将大量的汞带入云滴,并通过气溶胶-云相互作用影响大气中的汞地球化学循环。

著录项

  • 来源
    《Environmental Science & Technology》 |2018年第9期|5125-5134|共10页
  • 作者单位

    School of Environmental Science and Engineering, Shandong University, Jinan 250100, China;

    School of Environmental Science and Engineering, Shandong University, Jinan 250100, China;

    Department of Chemistry, College of Environmental Science and Forestry, State University of New York, Syracuse, New York 13210, United States;

    State Environmental Protection Key Laboratory of Sources and Control of Air Pollution Complex and State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China;

    Department of Earth and Atmospheric Science, University of Houston, Houston, Texas 77204, United States;

    Department of Chemistry, College of Environmental Science and Forestry, State University of New York, Syracuse, New York 13210, United States;

    Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong, China;

    School of Environmental Science and Engineering, Shandong University, Jinan 250100, China;

    School of Environmental Science and Engineering, Shandong University, Jinan 250100, 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

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