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首页> 外文期刊>Atmospheric chemistry and physics >Terpenylic acid and related compounds: Precursors for dimers in secondary organic aerosol from the ozonolysis of α-and β-pinene
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Terpenylic acid and related compounds: Precursors for dimers in secondary organic aerosol from the ozonolysis of α-and β-pinene

机译：萜烯酸和相关化合物：α-和β-pine烯的臭氧分解反应产生的二级有机气溶胶中二聚体的前体

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In the present study, we have characterized the structure of a higher-molecular weight (MW) 358 α-and β-pinene dimeric secondary organic aerosol (SOA) product that received ample attention in previous molecular characterization studies and has been elusive. Based on mass spectrometric evidence for deprotonated molecules formed by electrospray ionization in the negative ion mode and chemical considerations, it is suggested that diaterpenylic acid is a key monomeric intermediate for dimers of the ester type. It is proposed that cis-pinic acid is esterified with the hydroxyl-containing diaterpenylic acid, which can be explained through acid-catalyzed hydrolysis of the recently elucidated lactone-containing terpenylic acid and/or diaterpenylic acid acetate, both first-generation oxidation products. To a minor extent, higher-MW 358 and 344 diester products are formed containing other terpenoic acids as monomeric units, i.e., diaterpenylic acid instead of cis-pinic acid, and diaterebic acid instead of diaterpenylic acid. It is shown that the MW 358 diester and related MW 344 compounds, which can be regarded as processed SOA products, also occur in ambient fine (PM2.5) rural aerosol collected at night during the warm period of the 2006 summer field campaign conducted at K-puszta, Hungary, a rural site with coniferous vegetation. This indicates that, under ambient conditions, the higher-MW diesters are formed in the particle phase over a longer time-scale than that required for gas-to-particle partitioning of their monomeric precursors in laboratory α-/β-pinene ozonolysis experiments.
机译：在本研究中，我们已经表征了较高分子量（MW）358α-和β-pine烯二聚体二级有机气溶胶（SOA）产品的结构，该产品在以前的分子表征研究中受到了广泛关注，并且一直难以捉摸。基于在负离子模式下通过电喷雾电离形成的去质子化分子的质谱证据和化学方面的考虑，建议二对戊二烯酸是酯型二聚体的关键单体中间体。提出将顺式松香酸与含羟基的二硬脂酸酯化，这可以通过新近阐明的含内酯的萜烯酸和/或二硬脂酸乙酸酯这两种第一代氧化产物的酸催化水解来解释。在较小程度上，形成了更高的MW 358和344二酯产物，其包含其他萜烯酸作为单体单元，即，二邻苯二酸代替顺式松香酸，以及二对苯二酸代替二对戊二酸。结果表明，在2006年夏季野外活动的暖场期间，夜间收集的环境细粉（PM2.5）农村气溶胶中也出现了MW 358二酯和相关的MW 344化合物，这些化合物可被视为SOA的加工产品。匈牙利克普斯塔（K-puszta），一个具针叶植被的乡村遗址。这表明，在环境条件下，与在实验室α-/β-pine烯臭氧分解实验中对其单体前体进行气-粒分配所需的时间尺度相比，在更高的时间尺度上在颗粒相中形成了更高分子量的二酯。

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