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首页> 外文期刊>Environmental Science & Technology >Atmospheric Peroxides in a Polluted Subtropical Environment: Seasonal Variation, Sources and Sinks, and Importance of Heterogeneous Processes
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Atmospheric Peroxides in a Polluted Subtropical Environment: Seasonal Variation, Sources and Sinks, and Importance of Heterogeneous Processes

机译：受到污染的亚热带环境中的大气过氧化物：季节变化，源和汇以及异构过程的重要性

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摘要

Hydrogen peroxide (H_2O_2) and organic peroxides play an important role in atmospheric chemistry, but knowledge of their abundances, sources, and sinks from heterogeneous processes remains incomplete. Here we report the measurement results obtained in four seasons during 2011-2012 at a suburban site and a background site in Hong Kong. Organic peroxides were found to be more abundant than H_2O_2, which is in contrast to most previous observations. Model calculations with a multiphase chemical mechanism suggest important contributions from heterogeneous processes (primarily transition metal ion [TMI]-HOx reactions) to the H_2O_2 budget, accounting for about one-third and more than half of total production rate and loss rate, respectively. In comparison, they contribute much less to organic peroxides. The fast removal of H_2O_2 by these heterogeneous reactions explains the observed high organic peroxide fractions. Sensitivity analysis reveals that the role of heterogeneous processes depends on the abundance of soluble metals in aerosol, serving as a net H_2O_2 source at low metal concentrations, but as a net sink with high metal loading. The findings of this study suggest the need to consider the chemical processes in the aerosol aqueous phase when examining the chemical budget of gas-phase H_2O_2.
机译：过氧化氢（H_2O_2）和有机过氧化物在大气化学中起着重要作用，但是关于它们的丰度，来源和来自异质过程的汇的知识仍然不完整。在这里，我们报告了2011-2012年在香港郊区和背景站点四个季节中获得的测量结果。发现有机过氧化物比H_2O_2丰富，这与以前的大多数观察结果相反。具有多相化学机理的模型计算表明，异质过程（主要是过渡金属离子[TMI] -HOx反应）对H_2O_2预算有重要贡献，分别占总生产率和损耗率的三分之一和一半以上。相比之下，它们对有机过氧化物的贡献要小得多。通过这些异质反应快速去除H_2O_2可以解释所观察到的高有机过氧化物组分。敏感性分析表明，异质过程的作用取决于气溶胶中可溶性金属的丰度，在低金属浓度下作为净H_2O_2源，但作为高金属负载的净汇。这项研究的结果表明，在检查气相H_2O_2的化学收支时，有必要考虑气溶胶水相中的化学过程。

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  • 来源
    《Environmental Science & Technology》 |2014年第3期|1443-1450|共8页
  • 作者

    Jia Guo; Andreas Tilgner; Chungpong Yeung; Zhe Wang; Peter K. K. Louie; Connie W. Y. Luk; Zheng Xu; Chao Yuan; Yuan Gao; Steven Poon; Hartmut Herrmann; Shuncheng Lee; Ka Se Lam; Tao Wang;

  • 作者单位

    Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong, China,Chemistry Department, Leibniz Institute for Tropospheric Research (TROPOS), 04318 Leipzig, Germany;

    Chemistry Department, Leibniz Institute for Tropospheric Research (TROPOS), 04318 Leipzig, Germany;

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

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

    Environmental Protection Department, the Government of the Hong Kong Special Administrative Region, Hong Kong, China;

    Environmental Protection Department, the Government of the Hong Kong Special Administrative Region, Hong Kong, China;

    Environment Research Institute of Shandong University, Shandong University, Jinan, Shandong 250100, China;

    Environment Research Institute of Shandong University, Shandong University, Jinan, Shandong 250100, China;

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

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

    Chemistry Department, Leibniz Institute for Tropospheric Research (TROPOS), 04318 Leipzig, Germany;

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

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

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