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Organic Aerosol Formation from Photochemical Oxidation of Diesel Exhaust in a Smog Chamber

机译:烟雾室中柴油机废气的光化学氧化形成有机气溶胶

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摘要

Diluted exhaust from a diesel engine was photo-oxidized in a smog chamberto investigate secondary organic aerosol (SOA) production. Photochemical aging rapidly produces significant SOA, almost doubling the organic aerosol contribution of primary emissions after several hours of processing at atmospherically relevant hydroxyl radical concentrations. Less than 10% of the SOA mass can be explained using a SOA model and the measured oxidation of known precursors such as light aromatics. However, the ultimate yield of SOA is uncertain because it is sensitive to treatment of particle and vapor losses to the chamber walls. Mass spectra from an aerosol mass spectrometer (AMS) reveal that the organic aerosol becomes progressively more oxidized throughout the experiments, consistent with sustained, multi-generational production.
机译:来自柴油机的稀释废气在烟雾室中被光氧化,以研究二次有机气溶胶(SOA)的产生。光化学老化迅速产生大量的SOA,在与大气有关的羟基自由基浓度下经过数小时的处理后,一次排放的有机气溶胶贡献几乎翻了一番。使用SOA模型和已知的前体(如轻质芳烃)的测得的氧化度可解释不到SOA质量的10%。但是,SOA的最终产量尚不确定,因为它对处理颗粒和蒸汽损失到室壁很敏感。气溶胶质谱仪(AMS)的质谱表明,整个实验过程中有机气溶胶的氧化程度逐渐提高,这与持续的多代生产相一致。

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