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首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Measurement of vapor pressures and heats of sublimation of dicarboxylic acids using atmospheric solids analysis probe mass spectrometry
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Measurement of vapor pressures and heats of sublimation of dicarboxylic acids using atmospheric solids analysis probe mass spectrometry

机译：使用大气固体分析探针质谱法测量二羧酸的蒸气压和升华热

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摘要

Vapor pressures of low volatility compounds are important parameters in several atmospheric processes, including the formation of new particles and the partitioning of compounds between the gas phase and particles. Understanding these processes is critical for elucidating the impacts of aerosols on climate, visibility, and human health. Dicarboxylic acids are an important class of compounds in the atmosphere for which reported vapor pressures often vary by more than an order of magnitude. In this study, atmospheric solids analysis probe mass spectrometry (ASAP-MS), a relatively new atmospheric pressure ionization technique, is applied for the first time to the measurement of vapor pressures and heats of sublimation of a series of dicarboxylic acids. Pyrene was also studied because its vapor pressures and heat of sublimation are relatively well-known. The heats of sublimation measured using ASAP-MS were in good agreement with published values. The vapor pressures, assuming an evaporation coefficient of unity, were typically within a factor of ～3 lower than published values made at similar temperatures for most of the acids. The underestimation may be due to diffusional constraints resulting from evaporation at atmospheric pressure. However, this study establishes that ASAP-MS is a promising new technique for such measurements.
机译：低挥发性化合物的蒸气压是几种大气过程中的重要参数，包括新颗粒的形成以及气相和颗粒之间的化合物分配。了解这些过程对于阐明气溶胶对气候，能见度和人类健康的影响至关重要。二元羧酸是大气中一类重要的化合物，据报告，其蒸气压通常变化超过一个数量级。在这项研究中，大气固体分析探针质谱（ASAP-MS）是一种相对较新的大气压电离技术，首次被用于测量一系列二元羧酸的蒸气压和升华热量。还对also进行了研究，因为its的蒸气压和升华热是众所周知的。使用ASAP-MS测量的升华热与已公布的值高度吻合。假设蒸发系数为1，则蒸气压通常比大多数酸在相似温度下公布的值低约3倍。低估可能是由于大气压下蒸发导致的扩散约束所致。但是，这项研究确定了ASAP-MS是用于此类测量的有前途的新技术。

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