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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Permeability of acetic acid through organic films at the air-aqueous interface
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Permeability of acetic acid through organic films at the air-aqueous interface

机译：醋酸透过气-水界面处有机膜的渗透性

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Recent field studies of collected aerosol particles, both marine and continental, show that the outermost layers contain long-chain (C >= 18) organics. The presence of these long- chain organics could impede the transport of gases and other volatile species across the interface. This could effect the particle's composition, lifetime, and heterogeneous chemistry. In this study, the uptake rate of acetic acid vapor across a clean interface and through films of long-chain organics into an aqueous subphase solution containing an acid-base indicator (bromocresol green) was measured under ambient conditions using visible absorption spectroscopy. Acetic acid is a volatile organic compound (VOC) and is an atmospherically relevant organic acid. The uptake of acetic acid through single-component organic films of 1-octadecanol (C18H38O), 1-triacontanol (C30H62O), cis-9-octadecen-1-ol (C18H36O), and nonacosane (C29H60) in addition to two mixed films containing equimolar 1-triacontanol/ nonacosane and equimolar 1-triacontanol/cis-9-octadecen-1-ol was determined. These species represent long- chain organic compounds that reside at the air-aqueous interface of atmospheric aerosols. The cis-9-octadecen-1-ol film had little effect on the net uptake rate of acetic acid vapor into solution; however, the uptake rate was reduced by almost one-half by an interfacial film of 1-triacontanol. The measured uptake rates were used to calculate the permeability of acetic acid through the various films which ranged from 1.5 x 10(-3) cm s(-1) for 1-triacontanol, the least permeable film, to 2.5 x 10(-2) cm s(-1) for cis-9-octadecen-1-ol, the most permeable film. Both mixed films had permeabilities that were between that of the single-component films comprising the mixture. This shows that the permeability of a mixed film may not be solely determined by the most permeable species in the mixture. The permeabilities of all the films studied here are discussed in relation to their molecular properties, pressure-area isotherms, and atmospheric implications.
机译：最近收集的海洋和大陆气溶胶颗粒的现场研究表明，最外层含有长链（C> = 18）有机物。这些长链有机物的存在可能会阻碍气体和其他挥发性物质跨界面的传输。这可能会影响粒子的组成，寿命和异质化学。在这项研究中，使用可见光吸收光谱法在环境条件下测量了穿过清洁界面并通过长链有机物薄膜进入含酸碱指示剂（溴甲酚绿）的亚相水溶液中的乙酸蒸气的吸收速率。乙酸是挥发性有机化合物（VOC），是与大气相关的有机酸。除两个混合膜外，还通过1-十八碳烯醇（C18H38O），1-三花生醇（C30H62O），顺式-9-十八烯-1-醇（C18H36O）和壬二烷（C29H60）的单组分有机膜吸收乙酸测定含有等摩尔的1-三古醇/壬二烷和等摩尔的1-三古醇/顺式9-十八碳烯-1-醇。这些物质代表长链有机化合物，它们位于大气气溶胶的水-气界面处。 cis-9-octadecen-1-ol膜对乙酸蒸气进入溶液的净吸收率影响不大。然而，1-三烷醇的界面膜将摄取速率降低了近一半。测得的摄取速率用于计算乙酸穿过各种薄膜的渗透率，对于渗透性最低的薄膜1-triacontanol，其渗透率范围从1.5 x 10（-3）cm s（-1）到2.5 x 10（-2） ）cm s（-1），用于最易渗透的薄膜cis-9-octadecen-1-ol。两种混合膜的渗透率都在包含混合物的单组分膜的渗透率之间。这表明混合膜的渗透性可能不完全由混合物中最易渗透的物质决定。讨论了本文研究的所有薄膜的渗透性，涉及它们的分子特性，压力-面积等温线和大气影响。

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