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

9632599 达维多维茨， 该项目是对大气化学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和测量痕量大气物种对水和其他液体的质量适应系数。在第一种方法中，适用于测量相对较大的气体吸收，气相物质与已知尺寸、温度和化学组成的小的单分散液滴的可控流相互作用。在第二种方法中，用于研究具有相对较小吸收的气体，痕量气体包含在受控气泡中，受控气泡夹带在感兴趣的液体流中。 在这个项目中，气体吸收和共沉积的研究一氧化氮，二氧化氮，硝酸根，五氧化二氮，硝酸，亚硝酸，氨，二氧化硫，甲醛和羟基自由基将进行作为一个函数的温度与水溶液，硫酸和亚硝酰硫酸溶液。将检查光化学、表面电荷和大气相关添加剂的影响。这些数据将最终导致在气液界面的化学一般，预测性的理解。 ***

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. ***