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首页> 外文期刊>Environmental Science & Technology >Photodegradation of α-Pinene Secondary Organic Aerosol Dominated by Moderately Oxidized Molecules
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Photodegradation of α-Pinene Secondary Organic Aerosol Dominated by Moderately Oxidized Molecules

机译：由中等氧化分子支配的α-脊烯二次有机气溶胶的光降解

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摘要

Atmospheric secondary organic aerosol (SOA) undergoes chemical and physical changes when exposed to UV radiation, affecting the atmospheric lifetime of the involved molecules. However, these photolytic processes remain poorly constrained. Here, we present a study aimed at characterizing, at amolecularlevel and in realtime, thechemical composition of α-pinene SOA exposed to UV-A light at 50% relative humidity in an atmospheric simulation chamber. Significant SOA mass loss is observed at high loadings (～100 μg m~(-3)), whereas the effect is less prevalentat lowerloadings (～20μgm~(-3)). Forthevastmajorityof moleculesmeasured by theextractiveelectrospray time-of-flightmass spectrometer,thereis afractionthatis photoactiveanddecays when exposed to UV-A radiation and a fraction that appears photorecalcitrant. The molecules that are most photoactive contain between 4 and 6 oxygen atoms, while the more highly oxygenated compounds and dimers do not exhibit significant decay. Overall, photolysis results in a reduction of the volatility of SOA, which cannot be explained by simple evaporative losses but requires either a change in volatility related to changes in functional groups or a change in physical parameters (i.e., viscosity).
机译：大气中的二次有机气溶胶（SOA）在暴露于UV辐射时经过化学和物理变化，影响所涉及的分子的大气寿命。然而，这些光解过程仍然受到严重限制。在这里，我们提出了一种旨在在AmoleCularlevel和实时表征的研究，该研究在大气模拟室中暴露于UV-A光的α-叉烯SOA的α-PineNe SOA的组合物。在高负荷（〜100μgm〜（-3））下观察到显着的SOA质量损失，而效果较少，较少的下载载体（〜20μgm〜（-3））。由右旋式电导时间飞行时间光谱仪进行分子释放，其中在暴露于UV-A辐射和出现光浆化物的级分时，从而Aftistthatis Photoactiveandecays。最含光活性的分子含有4至6个氧原子，而更高氧化的化合物和二聚体不会表现出显着的衰减。总体而言，光解导致SOA的挥发性的降低，这不能通过简单的蒸发损失来解释，但需要与官能团的变化或物理参数（即粘度）的变化有关的变化。

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  • 来源
    《Environmental Science & Technology》 |2021年第10期|6936-6943|共8页
  • 作者

    Veronika Pospisilova; David M. Bell; Houssni Lamkaddam; Amelie Bertrand; Liwei Wang; Deepika Bhattu; Xueqin Zhou; Josef Dommen; Andre S.H. Prevot; Urs Baltensperger; Imad El Haddad; Jay G. Slowik;

  • 作者单位

    Laboratory of Atmospheric Chemistry Paul Scherrer Institute 5232 Villigen Switzerland Tofwerk 3600 Thun Switzerland;

    Laboratory of Atmospheric Chemistry Paul Scherrer Institute 5232 Villigen Switzerland;

    Laboratory of Atmospheric Chemistry Paul Scherrer Institute 5232 Villigen Switzerland;

    Laboratory of Atmospheric Chemistry Paul Scherrer Institute 5232 Villigen Switzerland;

    Laboratory of Atmospheric Chemistry Paul Scherrer Institute 5232 Villigen Switzerland;

    Laboratory of Atmospheric Chemistry Paul Scherrer Institute 5232 Villigen Switzerland Department of Civil and Infrastructure Engineering Indian Institute of Technology fodhpur Karwar 342037 India;

    Laboratory of Atmospheric Chemistry Paul Scherrer Institute 5232 Villigen Switzerland;

    Laboratory of Atmospheric Chemistry Paul Scherrer Institute 5232 Villigen Switzerland;

    Laboratory of Atmospheric Chemistry Paul Scherrer Institute 5232 Villigen Switzerland;

    Laboratory of Atmospheric Chemistry Paul Scherrer Institute 5232 Villigen Switzerland;

    Laboratory of Atmospheric Chemistry Paul Scherrer Institute 5232 Villigen Switzerland;

    Laboratory of Atmospheric Chemistry Paul Scherrer Institute 5232 Villigen Switzerland;

  • 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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