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首页> 外文期刊>Environmental Science & Technology >Ionic Strength Effect Alters the Heterogeneous Ozone Oxidation of Methoxyphenols in Going from Cloud Droplets to Aerosol Deliquescent Particles
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Ionic Strength Effect Alters the Heterogeneous Ozone Oxidation of Methoxyphenols in Going from Cloud Droplets to Aerosol Deliquescent Particles

机译：离子强度效应改变了从云液滴到气溶胶潮解颗粒的甲氧基苯酚的非均相臭氧氧化

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摘要

Methoxyphenols are one of the most abundant classes of biomarker tracers for atmospheric wood smoke pollution. The reactions of atmospheric oxidants (ozone, OH) with methoxyphenols can contribute to the formation of secondary organic aerosols (SOA). Here, for the first time, we use the well-established vertical wetted wall flow tube (VWWFT) reactor to assess the effect of ionic strength (I), pH, temperature, and ozone concentration on the reaction kinetics of ozone with acetosyr-ingone (ACS), as a representative methoxyphenol compound. At fixed pH 3, typical for acidic atmospheric deliquescent particles, and at I = 0.9 M adjusted by Na_2SO_4, the uptake coefficient (γ) of O_3 increases by 2 orders of magnitude from γ = (5.0 ± 0.8) × 10~(-8) on neat salt solution (Na_2SO_4) to γ = (6.0 ± 0.01) ×10~(-6) on a mixture of ACS and Na_2SO_4. The comparison of the uptake coefficients of O_3 at different pH values indicates that the reaction kinetics strongly depends on the acidity of the phenolic group of ACS. The observed different reactivity of gas-phase ozone with ACS has implications for ozone uptake by the dilute aqueous phase of cloud droplets and by aerosol deliquescent particles loaded with inorganic salts, and it can affect the formation of SOA in the atmosphere.
机译：甲氧基苯酚是大气木烟雾污染的最丰富的生物标志物示踪剂之一。大气氧化剂（臭氧，OH）与甲氧基苯酚的反应可有助于形成二次有机气溶胶（SOA）。在此，我们首次使用良好的垂直湿润的壁流管（VWWFT）反应器来评估离子强度（I），pH，温度和臭氧浓度对乙酰硼吲哚的反应动力学的影响（ACS）作为代表性的甲氧基苯酚化合物。在固定的pH 3，酸性大气潮颌骨典型的典型，并且在I = 0.9M通过Na_2SO_4调节，O_3的摄取系数（γ）从γ=（5.0±0.8）×10〜（-8）增加2个级别）在ACS和NA_2SO_4的混合物上纯盐溶液（NA_2SO_4）至γ=（6.0±0.01）×10〜（-6）。 O_3在不同pH值下的摄取系数的比较表明反应动力学强烈取决于ACS的酚类基的酸度。观察到具有ACS的气相臭氧的不同反应性具有云液滴的稀水相的臭氧摄取的影响，并且由加载有无机盐的气溶胶潮解颗粒，并且它可以影响大气中SOA的形成。

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  • 来源
    《Environmental Science & Technology》 |2020年第20期|12898-12907|共10页
  • 作者

    Majda Mekic; Yiqun Wang; Gwendal Loisel; Davide Vione; Sasho Gligorovski;

  • 作者单位

    State Key Laboratory of Organic Geochemistry Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou 510 640 China University of Chinese Academy of Sciences Beijing 100049 China;

    State Key Laboratory of Organic Geochemistry Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou 510 640 China University of Chinese Academy of Sciences Beijing 100049 China;

    State Key Laboratory of Organic Geochemistry Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou 510 640 China;

    Dipartimento di Chimica Universita degli Studi di Torino 10125 Torino Italy;

    State Key Laboratory of Organic Geochemistry Guangzhou Institute of Geochemistry Chinese Academy of Sciences Guangzhou 510 640 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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