Laboratory Studies of Heterogeneous Gas-Liquid Interactions of Atmospheric Trace Gases

大气痕量气体非均相气液相互作用的实验室研究

• 批准号: 9632599
• 负责人: Paul Davidovits
• 金额: $ 47.2万
• 依托单位: Boston College
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1996
• 资助国家: 美国
• 起止时间: 1996-09-15 至 2000-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9632599&HistoricalAwards=false
• 关键词: Laboratory; Studies; Heterogeneous; Gas; Liquid

9632599 Davidovits, This project is a laboratory investigation of heterogeneous reactions important to the chemistry of the atmosphere. In collaboration with Aerodyne Research, Inc., the investigators have developed two techniques for studying gas uptake processes and measuring mass accommodation coefficients of trace atmospheric species on water and other liquids. In the first method, suitable for measuring relatively large gas uptakes, the gas phase species interacts with a controllable stream of small monodispersed droplets of known size, temperature, and chemical composition. In the second method, used to study gases with relatively smaller uptakes, the trace gas is contained in controlled bubbles entrained in a flow of the liquid of interest. In this project, gas uptake and co-deposition studies for nitric oxide, nitrogen dioxide, nitrate radical, dinitrogen pentoxide, nitric acid, nitrous acid, ammonia, sulfur dioxide, formaldehyde, and hydroxyl radical will be carried out as a function of temperature with aqueous solutions, sulfuric acid and nitrosyl sulfuric acid solutions. The effect of photochemistry, surface charge, and atmospherically relevant additives will be examined. These data will eventually lead to a general, predictive understanding of chemistry at the gas-liquid interface. ***

9632599 Davidovits，这个项目是对对大气化学很重要的多相反应的实验室研究。与Aerodyne Research，Inc.合作，研究人员开发了两种技术，用于研究气体吸收过程，并测量微量大气物种在水和其他液体上的质量调节系数。在第一种方法中，适用于测量相对较大的气体吸收，气相物种与已知大小、温度和化学成分的可控制的单分散小液滴相互作用。在第二种方法中，用于研究吸收相对较小的气体，痕量气体包含在受控制的气泡中，这些气泡被携带在感兴趣的液体的流动中。在本项目中，将在水溶液、硫酸和亚硝酰硫酸溶液中进行一氧化氮、二氧化氮、硝酸根、五氧化二氮、硝酸、亚硝酸、氨、二氧化硫、甲醛和羟基自由基的气体吸收和共沉积随温度变化的研究。将考察光化学、表面电荷和与大气相关的添加剂的影响。这些数据最终将导致对气液界面化学的普遍的、预测性的理解。***