Measured Saturation Vapor Pressures of Phenolic and Nitro-aromatic Compounds.
Measured Saturation Vapor Pressures of Phenolic and Nitro-aromatic Compounds.
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DOI：
10.1021/acs.est.6b06364
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发表时间：
2017-03
影响因子：
11.4
通讯作者：
T. Bannan;A. M. Booth;Benjamin T. Jones;S. O'Meara;M. Barley;I. Riipinen;Carl J. Percival;D. Topping
中科院分区：
文献类型：
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作者：
T. Bannan;A. M. Booth;Benjamin T. Jones;S. O'Meara;M. Barley;I. Riipinen;Carl J. Percival;D. Topping
酚类和硝基-芳香族化合物是大气气溶胶中的剧毒成分，目前还没有被很好地了解。在这篇文章中，用KEMS测量了酚类和硝基芳香化合物在一定温度范围内(298-318K)的固体和过冷液体饱和蒸汽压。在这项研究中评估的蒸汽压估计方法，不复制观察到的对官能团相对位置的依赖性。除了少数例外，这些估计偏向于预测过高的饱和蒸汽压，在某些情况下会高出5-6个数量级。基本分配理论比较表明，在这种情况下，对蒸汽压的高估将导致我们预期这些化合物以气体状态存在，而本研究的测量表明，如果吸附分配起主导作用，这些酚类和硝基芳香族化合物将在广泛的环境条件下分配到凝聚态。虽然这些技术可能同时具有结构和参数的不确定性，但这里提供的新数据应该支持试图确定含氮有机物对气溶胶生长和人类健康影响的研究。
Phenolic and nitro-aromatic compounds are extremely toxic components of atmospheric aerosol that are currently not well understood. In this Article, solid and subcooled-liquid-state saturation vapor pressures of phenolic and nitro-aromatic compounds are measured using Knudsen Effusion Mass Spectrometry (KEMS) over a range of temperatures (298-318 K). Vapor pressure estimation methods, assessed in this study, do not replicate the observed dependency on the relative positions of functional groups. With a few exceptions, the estimates are biased toward predicting saturation vapor pressures that are too high, by 5-6 orders of magnitude in some cases. Basic partitioning theory comparisons indicate that overestimation of vapor pressures in such cases would cause us to expect these compounds to be present in the gas state, whereas measurements in this study suggest these phenolic and nitro-aromatic will partition into the condensed state for a wide range of ambient conditions if absorptive partitioning plays a dominant role. While these techniques might have both structural and parametric uncertainties, the new data presented here should support studies trying to ascertain the role of nitrogen containing organics on aerosol growth and human health impacts.