Development of Photofragmentation Laser Induced Fluorescence Sensor for Measurements of CH31 in the Marine Boundary Layer

开发用于测量海洋边界层中 CH31 的光碎裂激光诱导荧光传感器

• 批准号: 9807653
• 负责人: Scott Sandholm
• 金额: $ 24万
• 依托单位: Georgia Tech Research Corporation
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1998
• 资助国家: 美国
• 起止时间: 1998-09-01 至 2001-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9807653&HistoricalAwards=false
• 关键词: Development; Photofragmentation; Laser; Induced; Fluorescence

This award in the Environmental Geochemistry and Biogeochemistry Program is jointly supported by the Divisions of Atmospheric Science and Chemistry and by the MPS Office of Multidisciplinary Activities. Dr. Scott T. Sandholm of the School of Earth and Atmospheric Sciences, Georgia Institute of Technology, will develop a photofragmentation laser induced fluorescence sensor (PF-LIF) to measure volatile methyl iodide in situ in the marine boundary layer. Current detection methods for organic iodides rely heavily on analysis of stored `grab` samples and can be quite sensitive to preparation and handling of samples and to thermal degradation. The LIF sensor will permit in situ measurements as well as temporal emission profiles of methyl iodide and other simple organic iodides to the atmosphere from oceanic and coastal regions. The method is expected to have the sensitivity and selectivity needed to be effective. The similarities in photofragmentation dynamics of organic iodides enables total iodine emission to be measured by following the cumulative photofragmented production of atomic iodine as I* for all organic iodides known to be emitted from oceanic sources. The role of iodine in tropospheric and stratospheric ozone cycles is not well understood due to lack of quantitative measurements of the source compounds. Organic iodide compounds are thought to evaporate from the ocean and serve as a source. In this research, a new method for direct measurement of iodine will be developed and tested in field deployment off the coast of Georgia.

环境地球化学和生物地球化学项目的这个奖项 由大气科学部和 化学和多学科活动的MPS办公室。 博士 斯科特·T地球与大气科学学院的桑德霍姆， 格鲁吉亚理工学院将开发一种光致碎裂激光器 诱导荧光传感器（PF-LIF）测量挥发性碘甲烷 在海洋边界层。 有机污染物的检测方法 碘化物在很大程度上依赖于对储存的“抓取”样品的分析， 对样品的制备和处理以及对热 降解 激光诱导荧光传感器将允许现场测量，以及 碘甲烷和其他简单有机物时间发射分布 碘从海洋和沿海地区进入大气。 述的方法 预期具有所需的灵敏度和选择性， 有效 有机物光碎裂动力学的相似性 碘化物使总碘排放量能够通过以下方式测量： 原子碘的累积光碎裂产生量，以I* 表示， 已知从海洋排放的有机碘化物。 碘在对流层和平流层臭氧循环中的作用不是 由于缺乏对源的定量测量， 化合物.有机碘化物化合物被认为是从 海洋，并作为一个来源。 本研究提出了一种新的直接 将在实地部署中开发和测试碘的测量方法 在格鲁吉亚海岸附近