...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>The journal of physical chemistry, A. Molecules, spectroscopy, kinetics, environment, & general theory >Temperature-Dependent Henry's Law Constants of Atmospheric Amines
【24h】

Temperature-Dependent Henry's Law Constants of Atmospheric Amines

机译：取决于温度的大气胺的亨利定律常数

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

There has been growing interest in understanding atmospheric amines in the gas phase and their mass transfer to the aqueous phase because of their potential roles in cloud chemistry, secondary organic aerosol formation, and the fate of atmospheric organics. Temperature-dependent Henry's law constants (K-H) of atmospheric amines, a key parameter in atmospheric chemical transport models to account for mass transfer, are mostly unavailable. In this work, we investigated gas liquid equilibria of five prevalent atmospheric amines, namely 1-propylamine, di-n-propylamine, trimethylamine, allylamine, and 4-methylmorpholine using bubble column technique. We reported effective K-H, intrinsic K-H, and gas phase diffusion coefficients of these species over a range of temperatures relevant to the 4 lower atmosphere for the first time. The measured K-H at 298 K and enthalpy Environmental pH of solution for 1-propylamine, di-n-propylamine, trimethylamine, allylamine, and 4-methylmorpholine are 61.4 +/- 4.9 mol L-1 atm(-1) and -49.0 +/- 4.8 kJ mol(-1); 14.5 +/- 1.2 mol L-1 atm(-1) and -72.5 +/- 6.8 kJ mol(-1); 8.9 +/- 0.7 mol L-1 atm(-1) and -49.6 +/- 4.7 kJ mol(-1) 103.5 +/- 10.4 mol L-1 atm(-1) and -42.7 +/- 4.3 kJ mol(-1); and 952.2 +/- 114.3 mol L-1 atm(-1) and -82.7 +/- 9.7 kJ mol(-1), respectively. In addition, we evaluated amines characteristic times to achieve gas liquid equilibrium for partitioning between gas and aqueous phases. Results show gas liquid equilibrium can be rapidly established at natural cloud droplets surface, but the characteristic times may be extended substantially at lower temperatures and pHs. Moreover, our findings imply that atmospheric amines are more likely to exist in cloud droplets, and ambient temperature, water content, and pH of aerosols play important roles in their partitioning.
机译：人们越来越了解气相中的大气胺及其向水相的传质，因为它们在云化学，二次有机气溶胶的形成以及大气有机物中的命运中具有潜在的作用。大气胺的依赖温度的亨利定律常数（K-H）是大气化学传输模型中考虑质量转移的关键参数，目前几乎不可用。在这项工作中，我们使用鼓泡塔技术研究了五种常见的大气胺的气液平衡，即1-丙胺，二正丙胺，三甲胺，烯丙基胺和4-甲基吗啉。我们首次报告了这些物种在与4个较低大气层相关的温度范围内的有效K-H，固有K-H和气相扩散系数。 1-丙胺，二正丙胺，三甲胺，烯丙基胺和4-甲基吗啉在298 K和焓下测得的KH溶液的环境pH为61.4 +/- 4.9 mol L-1 atm（-1）和-49.0 + /-4.8 kJ mol（-1）; 14.5 +/- 1.2 mol L-1 atm（-1）和-72.5 +/- 6.8 kJ mol（-1）; 8.9 +/- 0.7 mol L-1 atm（-1）和-49.6 +/- 4.7 kJ mol（-1）103.5 +/- 10.4 mol L-1 atm（-1）和-42.7 +/- 4.3 kJ mol （-1）;和952.2 +/- 114.3 mol L-1 atm（-1）和-82.7 +/- 9.7 kJ mol（-1）。另外，我们评估了胺的特征时间，以实现气液平衡以在气相和水相之间分配。结果表明，可以在天然云滴表面迅速建立气液平衡，但是特征温度在较低的温度和pH值下可能会大大延长。此外，我们的发现表明，大气胺更可能存在于云滴中，并且环境温度，水含量和气溶胶的pH值在其分配中起着重要作用。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号