As global air pollution aggravates, it urges us to investigate the evolution of atmospheric related emissions. Recently oxidation flow reactor (OFR) has been widely used to simulate the aging of atmospheric related emissions as its excellent performance. In this work, we systematically characterized the SOA formation from α-pinene using a custom-built OFR under different conditions. The particle loss of the OFR was evaluated by particle transmission efficiency, then the effect of O₃ concentration, relative humidity (RH), precursor amounts, OH exposure level, and acidic seed aerosol on SOA formation was investigated. The particle losses of our OFR for particles above 50 nm were very small, which was comparable to or even better than those of previous traditional flow reactors. The formation of SOA particles nearly achieved stability after UV radiation for 15 min. When OH exposure concentration at approximately 0.6 × 10¹² molec cm⁻³ s, the SOA yield reached the maximum yield of 0.51 and 0.39 in the presence and absence of acidic seed aerosol respectively. The addition of acidic seed aerosol increased both particle number concentration and particle size, resulting in an increase of SOA yield of 1.2–1.5 times at OH exposure concentration ranged from 0.1 × 10¹² to 1.8 × 10¹² molec cm⁻³ s. The results provided significant guidance for studying the aging of atmospheric related emission under different working conditions by using an OFR.

随着全球空气污染的加剧，它敦促我们研究与大气有关的排放的演变。最近，氧化流反应器（OFR）具有出色的性能，已广泛用于模拟与大气有关的排放的老化。在这项工作中，我们使用定制的OFR在不同条件下系统地表征了α-pine烯的SOA形成。通过粒子传输效率评估OFR的粒子损失，然后评估O ₃的影响研究了浓度，相对湿度（RH），前体量，OH暴露水平和酸性种子气溶胶对SOA形成的影响。对于50纳米以上的颗粒，我们的OFR的颗粒损失非常小，与以前的传统流式反应器相当或什至更好。在紫外线辐射15分钟后，SOA颗粒的形成几乎达到了稳定性。当在约0.6×10 OH的暴露浓度¹² molec厘米^-3 s时，SOA收率分别达到在酸性种子气雾剂的存在和不存在0.51和0.39的最大产率。酸性种子气雾剂的加入增加了颗粒数浓度和粒径，导致在0.1×10的OH暴露浓度下，SOA产量增加了1.2–1.5倍。¹²至1.8×10 ¹²摩尔cm ^-3 s。研究结果为研究不同工作条件下大气相关排放的老化提供了重要的指导。