Efficient scavenging of Criegee intermediates on water by surface-active cis-pinonic acid
Efficient scavenging of Criegee intermediates on water by surface-active cis-pinonic acid
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DOI：
10.1039/c7cp03869k
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发表时间：
2017-07-14
影响因子：
3.3
通讯作者：
Colussi, A. J.
中科院分区：
文献类型：
--
作者：
Enami, Shinichi;Colussi, A. J.
顺式-蒎酮酸（CPA）是生物源α-蒎烯排放物的大气氧化的主要产物和二次有机气溶胶（SOA）的主要组分，是形成极低挥发性化合物的潜在关键物质。在这里，我们报告说，CPA是一个非常有效的清除剂的Criegee中间体（CI）的水表面。与预期相反，毫摩尔CPA（具有刚性骨架的表面活性C-10酮基羧酸）能够与23 M本体水竞争在水：乙腈溶剂的表面上通过O-3（g）臭氧分解倍半萜溶质中产生的CI。这一发现的意义在于CPA与水性有机气溶胶表面上的倍半萜烯CI的反应将直接产生C-25物质。在空气-液体界面的竞争反应取决于界面，而不是散装反应物浓度的发现应纳入目前的化学模型处理SOA的形成，生长和老化。
cis- Pinonic acid (CPA), the main product of the atmospheric oxidation of biogenic a-pinene emissions and a major component of secondary organic aerosol (SOA), is a potentially key species en route to extremely low volatility compounds. Here, we report that CPA is an exceptionally efficient scavenger of Criegee intermediates (CIs) on aqueous surfaces. Against expectations, millimolar CPA (a surface-active C-10 keto-carboxylic acid possessing a rigid skeleton) is able to compete with 23 M bulk water for the CIs produced in the ozonolysis of sesquiterpene solutes by O-3(g) on the surface of a water: acetonitrile solvent. The significance of this finding is that CPA reactions with sesquiterpene CIs on the surface of aqueous organic aerosols would directly generate C-25 species. The finding that competitive reactions at the air-liquid interface depend on interfacial rather than bulk reactant concentrations should be incorporated in current chemical models dealing with SOA formation, growth and aging.