一个关于具有大气相关性的化合物的和花相对湿度的数据库
Chao Peng1,2, Lanxiadi Chen1,2,3, Mingjin Tang1,2,3
1State Key Laboratory of Organic Geochemistry, Guangdong Key Laboratory of Environmental Protection and Resources Utilization, and Guangdong-Hong Kong-Macao Joint Laboratory for Environmental Pollution and Control, Guangzhou Institute of Geochemistry, Chinese Academy of Sciences, Guangzhou 510640, China.
Fundamental research
|June 27, 2024
概括
这项研究汇总了110种化合物的化相对湿度 (DRH) 和花相对湿度 (ERH) 值,为大气科学创造了一个关键的数据库. 它提供了首选值,并讨论了影响这些关键高度参数的因素.
科学领域:
- 大气中的化学成分
- 环境科学环境科学
- 物理化学 物理化学
背景情况:
- 鲜花相对湿度 (DRH) 和花花相对湿度 (ERH) 是控制物质相位和湿度的关键参数.
- 这些特性在大气科学中至关重要,影响气溶的形成,云层过程和空气质量.
- 对于DRH和ERH现有的实验数据是广泛的,但缺乏全面的总结.
研究的目的:
- 为大气相关化合物创建DRH和ERH值的第一个全面数据库.
- 为110种化合物 (68种无机,42种有机) 编制和标准化DRH和ERH数据.
- 为298K提供首选的DRH和ERH值,并分析影响因素.
主要方法:
- 系统的文献审查,以收集实验性DRH和ERH测量.
- 数据编制和批判性评估,以在标准温度 (298 K) 下确定首选值.
- 分析温度和颗粒大小对DRH和ERH测量的影响.
主要成果:
- 已经开发了一个新型数据库,包含了110种化合物的DRH和ERH值.
- 对于每个编译的化合物,在298K时提供了首选的DRH和ERH值.
- 该研究讨论了温度和颗粒大小对测量DRH和ERH值的影响.
结论:
- 建立的数据库作为大气和环境研究的基础资源.
- 这项工作强调了对湿度学性质进行标准化测量和可访问数据的需要.
- 未来的努力将集中在扩大数据库的范围和改善更广泛的科学用途的可访问性.
相关概念视频
01:10Volatilization
378
Volatilization gravimetry is an analytical technique that measures the mass lost due to the volatilization of the substance. This technique is used to estimate the amount of volatile material in a sample. To perform this method, heat a known amount of the sample to a high temperature in a crucible or other suitable vessel. The volatile substance in the sample evaporates, and the vapor is completely expelled from the crucible either by heating the sample or bubbling a stream of inert gas through...
378
01:01Distillation: Vapor–Liquid Equilibria
2.8K
Distillation is a separation technique that takes advantage of the boiling point properties of disparate elements in a mixture. To perform distillation, we begin by heating a miscible mixture of two liquids with a significant difference in boiling points (at least 20°C). As the solution heats up and reaches the bubble point of the more volatile component, some molecules of the more volatile component transition into the gas phase and travel upward into the condenser, which is a glass tube...
2.8K
03:11Precipitation of Ions
27.9K
Predicting Precipitation
The equation that describes the equilibrium between solid calcium carbonate and its solvated ions is:
The equation that describes the equilibrium between solid calcium carbonate and its solvated ions is:
27.9K
01:19Precipitation Titration: Endpoint Detection Methods
1.7K
In argentometric precipitation titrations, endpoints can be detected visually by the Mohr, Volhard, and Fajans methods. In the Mohr method, adding a soluble chromate indicator gives an initial yellow color to the analyte solution. As the titrant is added, the first excess of silver ions forms a red silver chromate precipitate, marking the endpoint. The solution pH should be maintained at about 8 by adding solid CaCO3.
In the Volhard method, a standard excess of AgNO3 is first added to the...
In the Volhard method, a standard excess of AgNO3 is first added to the...
1.7K
03:28Vapor Pressure Lowering
26.5K
The equilibrium vapor pressure of a liquid is the pressure exerted by its gaseous phase when vaporization and condensation are occurring at equal rates:
Dissolving a nonvolatile substance in volatile liquid results in a lowering of the liquid’s vapor pressure. This phenomenon can be explained by considering the effect of added solute molecules on the liquid's vaporization and condensation processes. To vaporize, solvent molecules must be present at the surface of the solution....
Dissolving a nonvolatile substance in volatile liquid results in a lowering of the liquid’s vapor pressure. This phenomenon can be explained by considering the effect of added solute molecules on the liquid's vaporization and condensation processes. To vaporize, solvent molecules must be present at the surface of the solution....
26.5K
01:26Precipitation Titration: Overview
6.1K
Precipitation titration involves the reaction of a titrant and an analyte to generate an insoluble precipitate. While precipitation titration uses various precipitating agents, silver nitrate is the most common precipitating reagent; titrations involving Ag+ are called argentometric titrations. Usually, the endpoint in a precipitation titration can be detected by visual indicators.
A precipitation titration curve demonstrates the change in concentration of the titrant or analyte upon adding the...
A precipitation titration curve demonstrates the change in concentration of the titrant or analyte upon adding the...
6.1K