Université Lyon, Université Claude Bernard Lyon 1, CNRS, IRCELYON,2 Avenue Albert Einstein, 69100, Lyon, France.
Department of physics, Laboratoires de physique des hauts Energies Modélisation et Simulation, Mohammed V University in Rabat, Rabat, Morocco.
Environ Sci Pollut Res Int. 2019 Jun;26(18):18411-18420. doi: 10.1007/s11356-019-05012-5. Epub 2019 May 2.
Oxidation flow reactors (OFRs) are increasingly used to study the formation and evolution of secondary organic aerosols (SOA) in the atmosphere. The OH/HO and OH/O ratios in OFRs are similar to tropospheric ratios. In the present work, we investigated the production of SOA generated by OH oxydation and ozonolysis of limonene in OFR as a function of OH exposure and O exposure. The results are compared with those obtained from the simulation chambers. The precursor gas is exposed to OH concentrations ranging from 2.11 × 10 to 1.91 × 10 molec cm, with an estimated exposure time in the OFR of 137 s. In the environmental chambers, the precursor was oxidized using OH concentrations between 2.10 × 10 and 2.12 × 10 molec cm over exposure times of several hours. In the overlapping OH exposure region, the highest SOA yields are obtained in the OFR, which is explained by the ozonolysis of limonene in the OFR. However, the yields decrease with the increase of OHexp in both systems.
氧化流反应器（OFR）越来越多地用于研究大气中二次有机气溶胶（SOA）的形成和演化。OFR 中的 OH/HO 和 OH/O 比值与对流层中的比值相似。在本工作中，我们研究了 OH 氧化和臭氧氧化柠檬烯生成 SOA 的情况，考察了 OH 暴露和 O 暴露对 SOA 生成的影响。实验结果与模拟腔中的结果进行了比较。前体气体暴露于 2.11×10 至 1.91×10 molec cm 的 OH 浓度下，估计在 OFR 中的暴露时间为 137 s。在环境腔中，前体在 OH 浓度为 2.10×10 至 2.12×10 molec cm 之间，暴露时间为数小时，进行氧化。在前体的 OH 暴露区重叠部分，OFR 中获得了最高的 SOA 产率，这是由于 OFR 中柠檬烯的臭氧分解所致。然而，在两个系统中，随着 OHexp 的增加，产率都会降低。
