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首页> 外文期刊>Environmental Science & Technology >Efficient Heterogeneous Formation of Ammonium Nitrate on the Saline Mineral Particle Surface in the Atmosphere of East Asia during Dust Storm Periods
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Efficient Heterogeneous Formation of Ammonium Nitrate on the Saline Mineral Particle Surface in the Atmosphere of East Asia during Dust Storm Periods

机译：硝酸铵在尘埃风暴期间盐水矿物质颗粒表面上的高效形成

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摘要

To understand the chemical evolution of dust in the current East Asian atmosphere, the chemistry of PM_(2.5) and size-resolved aerosols in Shanghai, China, during the 2019 dust storm event was investigated. Our results showed that concentrations of SO_4~(2-) in the city during the event highly correlated with Ca~(2+) and Na~+ due to the direct emissions of CaSO_4 and Na_2SO_4 from the upwind deserts. In contrast, during the event, NO_3~- linearly correlated with NH_4~+ at a molar ratio close to 1:1, and both almost entirely stayed in coarse particles, suggesting they accumulated on the dust surface as NH_4NO_3. Based on the field observations and laboratory smog chamber simulations, we found that NO_2 and O_3 in Shanghai during the dust period reacted to form N_2O_5, which subsequently hydrolyzed into HNO_3 on the surface of saline mineral dusts (e.g., CaSO_4 and Na_2SO_4) and was further neutralized by NH_3 as NH_4NO_3. The relative abundances of NO_3~- and NH_4~+ in Shanghai during the dust event were notably higher than those a decade ago, indicating that this heterogeneous formation of NH_4NO_3 on dust was enhanced by the abundantly coexisting NO_x, O_3, and NH_3 in the current East Asian atmosphere, which should be considered in future modeling studies.
机译：为了了解当前东亚大气中灰尘的化学演变，在2019年沙尘暴活动期间，中国上海的PM_（2.5）和尺寸分辨的气溶胶的化学进展。我们的研究结果表明，由于CASO_4和NA_2SO_4的直接排放，该城市中的SO_4〜（2-）在城市中的浓度为CA〜（2+）和NA_2SO_4来自Upwind Deserts的直接排放。相反，在事件期间，NO_3〜 - 与摩尔比的摩尔比线性相关，摩尔比接近1：1，并且两者几乎完全保持在粗颗粒上，表明它们在灰尘表面上累积为NH_4NO_3。基于现场观测和实验室烟雾室模拟，我们发现在尘埃期间的上海在灰尘周期内的NO_2和O_3反应形成N_2O_5，随后在盐水矿物粉尘（例如，CASO_4和NA_2SO_4）的表面上水解成HNO_3并进一步通过NH_3作为NH_4NO_3中和。在尘埃事件期间上海的NO_3〜 - 和NH_4〜+的相对丰度显着高于十年前的高度，表明当前的大量共存NO_X，O_3和NH_3增强了NH_4NO_3对粉尘的这种异质形成东亚大气层，应在未来的建模研究中考虑。

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  • 来源
    《Environmental Science & Technology》 |2020年第24期|15622-15630|共9页
  • 作者

    Can Wu; Si Zhang; Gehui Wang; Shaojun Lv; Dapeng Li; Lang Liu; Jianjun Li; Shijie Liu; Wei Du; Jingjing Meng; Liping Qiao; Min Zhou; Cheng Huang; Hongli Wang;

  • 作者单位

    Key Lab of Geographic Information Science of the Ministry of Education School of Geographic Sciences East China Normal University Shanghai 210062 China State Key Laboratory of Loess and Quaternary Geology Institute of Earth Environment Chinese Academy of Sciences Xi'an 710061 China;

    Key Lab of Geographic Information Science of the Ministry of Education School of Geographic Sciences East China Normal University Shanghai 210062 China;

    Key Lab of Geographic Information Science of the Ministry of Education School of Geographic Sciences East China Normal University Shanghai 210062 China State Key Laboratory of Loess and Quaternary Geology Institute of Earth Environment Chinese Academy of Sciences Xi'an 710061 China Institute of Eco-Chongming Shanghai 200062 China;

    Key Lab of Geographic Information Science of the Ministry of Education School of Geographic Sciences East China Normal University Shanghai 210062 China;

    Key Lab of Geographic Information Science of the Ministry of Education School of Geographic Sciences East China Normal University Shanghai 210062 China;

    State Key Laboratory of Loess and Quaternary Geology Institute of Earth Environment Chinese Academy of Sciences Xi'an 710061 China;

    State Key Laboratory of Loess and Quaternary Geology Institute of Earth Environment Chinese Academy of Sciences Xi'an 710061 China;

    Key Lab of Geographic Information Science of the Ministry of Education School of Geographic Sciences East China Normal University Shanghai 210062 China;

    Key Lab of Geographic Information Science of the Ministry of Education School of Geographic Sciences East China Normal University Shanghai 210062 China;

    School of Environment and Planning Liaocheng University Liaocheng 252000 China;

    State Environmental Protection Key Laboratory of Formation and Prevention of Urban Air Pollution Complex Shanghai Academy of Environmental Sciences Shanghai 200233 China;

    State Environmental Protection Key Laboratory of Formation and Prevention of Urban Air Pollution Complex Shanghai Academy of Environmental Sciences Shanghai 200233 China;

    State Environmental Protection Key Laboratory of Formation and Prevention of Urban Air Pollution Complex Shanghai Academy of Environmental Sciences Shanghai 200233 China;

    State Environmental Protection Key Laboratory of Formation and Prevention of Urban Air Pollution Complex Shanghai Academy of Environmental Sciences Shanghai 200233 China;

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