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首页> 外文期刊>Environmental Science & Technology >Depression of Ammonia Uptake to Sulfuric Acid Aerosols by Competing Uptake of Ambient Organic Gases
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Depression of Ammonia Uptake to Sulfuric Acid Aerosols by Competing Uptake of Ambient Organic Gases

机译：通过竞争环境有机气体的吸收来降低对硫酸气溶胶的氨吸收

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摘要

The neutralization of acidic aerosols by ammonia has been studied through experiments which combine ambient air with laboratory generated sulfuric acid aerosol. Results indicated that acidic aerosol mixed with organic free air and ammonia was neutralized on a time scale < 1 min, consistent with expectations. However, in the presence of ambient organic gases and ammonia, the rate of aerosol neutralization is significantly reduced. This reduction in ammonia uptake was concurrent with an increase in the amount of particle phase organics. A steady state in the NH_4+/SO4 " in the presence of organic gases was established on time scales of 10 min to several hours, corresponding to NH3 uptake coefficients in the range of 4 x 10~3~2 x 10~4. The degree to which neutralization was slowed was dependent upon the initial ammonia concentration and the organic mass added to the aerosols. These results suggest that inorganic equilibrium thermodynamic models may overestimate the rate of ammonia uptake and that ambient particles may remain acidic for longer than previously expected.
机译：通过将环境空气与实验室产生的硫酸气溶胶相结合的实验，研究了氨对酸性气溶胶的中和作用。结果表明，与有机游离空气和氨混合的酸性气溶胶在小于1分钟的时间内被中和，与预期一致。然而，在环境有机气体和氨的存在下，气溶胶中和的速率显着降低。氨吸收的减少与颗粒相有机物的量增加同时发生。在10分钟到几小时的时间范围内，在存在有机气体的情况下建立了NH_4 + / SO4-的稳态，对应的NH3吸收系数为4 x 10〜3〜2 x 10〜4。中和减慢的速度取决于初始氨的浓度和添加到气溶胶中的有机物质，这些结果表明，无机平衡热力学模型可能会高估氨的吸收速率，并且环境颗粒保持酸性的时间可能比以前预期的更长。

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  • 来源
    《Environmental Science & Technology》 |2011年第7期|p.2790-2796|共7页
  • 作者

    John Liggio; Shao-Meng Li; Alexander Vlasenko; Craig Stroud; Paul Makar;

  • 作者单位

    Atmospheric Science and Technology Directorate, Science and Technology Branch, Environment Canada, 4905 Dufferin Street,Toronto, Ontario M3H 5T4, Canada;

    Atmospheric Science and Technology Directorate, Science and Technology Branch, Environment Canada, 4905 Dufferin Street,Toronto, Ontario M3H 5T4, Canada;

    Atmospheric Science and Technology Directorate, Science and Technology Branch, Environment Canada, 4905 Dufferin Street,Toronto, Ontario M3H 5T4, Canada;

    Atmospheric Science and Technology Directorate, Science and Technology Branch, Environment Canada, 4905 Dufferin Street,Toronto, Ontario M3H 5T4, Canada;

    Atmospheric Science and Technology Directorate, Science and Technology Branch, Environment Canada, 4905 Dufferin Street,Toronto, Ontario M3H 5T4, Canada;

  • 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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