Impacts of SO2, Relative Humidity, and Seed Acidity on Secondary Organic Aerosol Formation in the Ozonolysis of Butyl Vinyl Ether.
Impacts of SO2, Relative Humidity, and Seed Acidity on Secondary Organic Aerosol Formation in the Ozonolysis of Butyl Vinyl Ether.
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DOI：
10.1021/acs.est.9b02702
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发表时间：
2019-07
影响因子：
11.4
通讯作者：
Peng Zhang;Tianzeng Chen;Jun Liu;Changgeng Liu;Jinzhu Ma;Qingxin Ma;Biwu Chu;Hong He
中科院分区：
文献类型：
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作者：
Peng Zhang;Tianzeng Chen;Jun Liu;Changgeng Liu;Jinzhu Ma;Qingxin Ma;Biwu Chu;Hong He
烷基乙烯基醚广泛用作燃料添加剂。尽管如此，它们的大气化学和二次有机气溶胶（SOA）的形成潜力仍然不是很清楚在复杂的污染条件下。在这项工作中，我们研究了SO2，相对湿度（RH），和颗粒酸度的形成和氧化态（OSc）的SOA从丁基乙烯基醚（BVE）臭氧分解的影响。增加SO2浓度产生了显着的促进SOA的形成和OSc由于显着增加H2SO 4颗粒和形成更多的高度氧化的成分。在SO2存在下，相对湿度的增加似乎分别在干燥范围（1%-10%）、低相对湿度范围（10%-42%）和中等相对湿度范围（42%-64%）促进、抑制和支配SOA的形成和OSc。这突出了H2O和SO2之间的竞争与稳定的Criegee中间体（sCI）在BVE臭氧分解在环境RH反应的重要性。颗粒酸性的增加主要是由于BVE占主导地位的SOA的化学组成的变化，但不是SOA的形成。这里提出的结果扩展了以前的分析BVE衍生的SOA，并进一步帮助我们了解SOA的形成潜力的BVE臭氧分解在高度复杂的污染条件下。
Alkyl vinyl ethers are widely used as fuel additives. Despite this, their atmospheric chemistry and secondary organic aerosol (SOA) formation potentials are still not well known under complex pollution conditions. In this work, we examined the impact of SO2, relative humidity (RH), and particle acidity on the formation and oxidation state (OSc) of SOA from butyl vinyl ether (BVE) ozonolysis. Increasing SO2 concentration produced a notable promotion of SOA formation and OSc due to the significant increase in H2SO4 particles and formation of more highly oxidized components. Increased RH in the presence of SO2 appeared to promote, suppress, and dominate the formation and OSc of SOA in the dry range (1%-10%), low RH range (10%-42%), and moderate RH range (42%-64%), respectively. This highlights the importance of competition between H2O and SO2 in reacting with the stabilized Criegee intermediate (sCI) in BVE ozonolysis at ambient RH. Increased particle acidity mainly contributed to the change in chemical composition of BVE-dominated SOA but not to SOA formation. Results presented here extend previous analysis of BVE-derived SOA and further aid our understanding of SOA formation potential of BVE ozonolysis under highly complex pollution conditions.