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Solubility of Methanol in Low-Temperature Aqueous Sulfuric Acid and Implications for Atmospheric Particle Composition

机译:甲醇在低温硫酸水溶液中的溶解度及其对大气颗粒组成的影响

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摘要

Using traditional Knudsen cell techniques, we find well-behaved Henry's law uptake of methanol, in aqueous 45-70 wt% H_2SO_4 solutions at temperatures between 197 and 231 K. Solubility of methanol increases with decreasing temperature and increasing acidity, with an effective Henry's law coefficient ranging from 10~5 to 10~8 M atm~(-1). Equilibrium uptake of methanol into sulfuric acid aerosol particles in the upper troposphere and lower stratosphere will not appreciably alter gas-phase concentrations of methanol. The observed room-temperature reaction between methanol and sulfuric acid is too slow to provide a sink for gaseous methanol at the temperatures of the upper troposphere and lower stratosphere. It is also too slow to produce sufficient quantities of soluble reaction products to explain the large amount of unidentified organic material seen in particles of the upper troposphere.
机译:使用传统的Knudsen电池技术,我们发现在197至231 K之间的温度下,在45-70 wt%的H_2SO_4水溶液中,甲醇的行为符合亨利定律。甲醇的溶解度随着温度的降低和酸度的增加而增加,有效的亨利定律系数范围为10〜5至10〜8 M atm〜(-1)。对流层上部和平流层下部中硫酸气溶胶颗粒对甲醇的平衡吸收不会明显改变甲醇的气相浓度。观察到的甲醇和硫酸之间的室温反应太慢,无法在对流层上部和平流层下部的温度下提供气态甲醇的吸收器。生产足够数量的可溶性反应产物也太慢了,无法解释在对流层上层颗粒中发现的大量未鉴定的有机物质。

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