Impacts of Mixed Gaseous and Particulate Pollutants on Secondary Particle Formation during Ozonolysis of Butyl Vinyl Ether
Impacts of Mixed Gaseous and Particulate Pollutants on Secondary Particle Formation during Ozonolysis of Butyl Vinyl Ether
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混合气态和颗粒污染物对丁基乙烯基醚臭氧分解过程中二次颗粒形成的影响
DOI：
10.1021/acs.est.9b07650
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发表时间：
2020
影响因子：
11.4
通讯作者：
He Hong
中科院分区：
文献类型：
--
作者：
Zhang Peng;Chen Tianzeng;Liu Jun;Chu Biwu;Ma Qingxin;Ma Jinzhu;He Hong
为了阐明共存大气污染物如何影响二次有机气溶胶（SOA）的形成，研究了混合气态污染物（CO和SO2）和混合有机-无机（MOI）颗粒物在正丁基乙烯基醚（BVE）臭氧分解过程中对SOA形成的影响.发现更高的CO水平（90 ppm）显著改变SOA的化学组成（促进单体，同时减少低聚物形成），而不引起总体SOA质量的太大变化。基于正矩阵因子分解（PMF）分析，非均相化学转化之间的预先形成和新形成的SOA的SOA形成的主要途径在MOI粒子的存在。此外，MOI颗粒在1%相对湿度（RH）下对SOA形成有增强作用，但在较高RH（10和55%）下的作用可以忽略不计。增强效果归因于形成的多功能产品，从预先形成的和新形成的SOA的高度功能化。观察到的可忽略不计的效果归因于不稳定的低聚物的裂解，作为预形成的和新形成的SOA的可逆低聚化的结果。即便如此，MOI粒子仍然可以影响新形成的SOA的组成。这些结果突出了需要考虑的SOA成分和它们的演变的混合气体和颗粒污染物的显着影响。
To clarify how coexisting atmospheric pollutants affect secondary organic aerosol (SOA) formation, we investigated the effects of mixed gaseous pollutants (CO and SO2) and mixed organic–inorganic (MOI) particles on SOA formation duringn-butyl vinyl ether (BVE) ozonolysis. Higher CO levels (90 ppm) were found to significantly change the chemical composition of SOA (prompting monomers while reducing oligomer formation) without causing much change in the overall SOA mass. Based on the positive matrix factorization (PMF) analysis, heterogeneous chemical conversions between preformed and newly formed SOA were the major pathways of SOA formation in the presence of MOI particles. Furthermore, MOI particles had an enhancing effect on SOA formation at 1% relative humidity (RH) but a negligible effect at higher RH (10 and 55%). The enhancing effect was attributed to the formation of multifunctional products resulting from high functionalization of preformed and newly formed SOA. The negligible effect observed was ascribed to the cleavage of unstable oligomers as a result of the reversible oligomerization of preformed and newly formed SOA. Even so, MOI particles could still affect the composition of newly formed SOA. These results highlight the need to account for the significant effect of mixed gaseous and particulate pollutants on both SOA constituents and their evolution.