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首页> 外文期刊>Environmental Science & Technology >Investigation of α-Pinene + Ozone Secondary Organic Aerosol Formation at Low Total Aerosol Mass
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Investigation of α-Pinene + Ozone Secondary Organic Aerosol Formation at Low Total Aerosol Mass

机译：低总气溶胶质量下α-P烯+臭氧二次有机气溶胶形成的研究

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摘要

We present a method for measuring secondary organic aerosol (SOA) production at low total organic mass concentration (C{sub}(OA)) using proton-transfer reaction mass spectrometry (PTR-MS). PTR-MS provides high time resolution measurements of gas-phase organic species and, coupled with particle measurements, allows for the determination of aerosol yield in real time. This approach facilitates the measurement of aerosol production at low C{sub}(OA); in fact aerosol mass fractions can be measured during α-pinene consumption as opposed to only at the completion of gas-phase chemistry. The high time resolution data are consistent with both the partitioning theory of Pankow (Atmos. Environ. 1994, 28, 185 and 189) and the previous experimental measurements. Experiments including the effect of UV illumination and NO{sub}x reveal additional features of α-pinene + ozone product photochemistry and volatility. The high time resolution data also elucidate aerosol production from α-pinene ozonolysis at C{sub}(OA) < 10 μg m{sup}(-3) and show that extrapolations of current partitioning models to conditions of low C{sub}(OA) significantly underestimate SOA production under dark, low-NO{sub}x conditions. However, extrapolations of current models overestimate SOA production under illuminated, higher-NO{sub}x conditions typical of polluted regional air masses.
机译：我们提出了一种使用质子转移反应质谱法（PTR-MS）在低总有机物质量浓度（C {sub}（OA））下测量二次有机气溶胶（SOA）生产的方法。 PTR-MS提供了气相有机物的高分辨率测量，并结合了颗粒测量，可以实时确定气溶胶的产量。这种方法有助于在低C {sub}（OA）下测量气溶胶的产生；实际上，可以在α-pine烯消耗期间测量气溶胶质量分数，而不是仅在气相化学完成时测量。高时间分辨率数据与Pankow的分区理论（Atmos。Environ。1994、28、185和189）以及以前的实验测量结果都一致。包括紫外线照射和NO {sub} x的影响在内的实验揭示了α-pine烯+臭氧产物光化学和挥发性的其他特征。高时间分辨率的数据还阐明了C {sub}（OA）<10μgm {sup}（-3）时α-pine烯臭氧分解产生的气溶胶，并表明当前分区模型外推到低C {sub}（ OA）大大低估了在暗，低NOx条件下的SOA产量。但是，当前模型的外推高估了受污染的区域性空气团典型的光照，较高的NOx条件下的SOA产量。

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