Gas Chromotograph/Mass Spectrometer System for the Determination of Atmospheric Sulfur Gases

用于测定大气中含硫气体的气相色谱/质谱仪系统

• 批准号: 8717861
• 负责人: Alan Bandy
• 金额: $ 42.8万
• 依托单位: Drexel University
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1988
• 资助国家: 美国
• 起止时间: 1988-05-01 至 1991-04-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=8717861&HistoricalAwards=false
• 关键词: Gas; Chromotograph; Mass; Spectrometer; System

A basic objective of current research on the chemistry of the atmosphere is to develop an improved understanding of the fundamental processes responsible for creating and destroying the trace chemical compounds present in the atmosphere. In order to study and understand the chemical, physical and biological processes influencing the composition of the atmosphere it is necessary to investigate and develop improved techniques for measuring the compounds present in the air. The objective of this project is to develop reliable new analytical techniques for studying the cycle of sulfur species through the global troposphere. These techniques have been designed to permit measurement of the concentrations of gaseous species currently thought to be important in the biogeochemical cycling of sulfur, carbon disulfide, through the atmosphere. These species include carbonyl sulfide, carbon disulfide, hydrogen sulfide, dimethyl sulfide, methyl mercaptan, and sulfur dioxide. The marine sulfur cycle is particularly interesting because it may link biological activity in the oceans to climate and cloud formation. Measurements of the concentrations of sulfur species provide data that are important for developing a quantitative understanding of the fluxes and reactions of these sulfur compounds. A technique of gas chromatography/mass spectrometer with isotopically labelled internal standards (GC/MS/ILS) has been developed and laboratory tested under NSF grant ATM-8515000. The instrumentation is capable of real time measurements of sulfur gases and is several times more sensitive than flame photometric detection. Isotopically labelled internal standards have improved precision and accuracy. This research will construct a field deployable (aircraft and ship platforms) instrument and test the performance of the instrument in the field.

当前大气化学研究的一个基本目标是更好地了解大气中存在的微量化合物的产生和破坏的基本过程。 为了研究和了解影响大气成分的化学、物理和生物过程，有必要研究和开发测量空气中存在的化合物的改进技术。 该项目的目标是开发可靠的新分析技术来研究全球对流层中硫物质的循环。 这些技术旨在测量目前被认为对硫、二硫化碳通过大气的生物地球化学循环很重要的气态物质的浓度。 这些物质包括羰基硫、二硫化碳、硫化氢、二甲硫醚、甲硫醇和二氧化硫。 海洋硫循环特别有趣，因为它可能将海洋中的生物活动与气候和云的形成联系起来。 硫物质浓度的测量提供的数据对于定量了解这些硫化合物的通量和反应非常重要。 采用同位素标记内标 (GC/MS/ILS) 的气相色谱/质谱仪技术已在 NSF 拨款 ATM-8515000 下开发并进行了实验室测试。 该仪器能够实时测量含硫气体，并且比火焰光度检测灵敏数倍。 同位素标记的内标提高了精度和准确度。 这项研究将建造一个可现场部署（飞机和船舶平台）的仪器并在现场测试该仪器的性能。