Construction of a gas-handling system for measurement of bond ordering in methane gas

构建用于测量甲烷气体中键序的气体处理系统

• 批准号: 1539023
• 负责人: Edward Young
• 金额: $ 3.1万
• 依托单位: University of California-Los Angeles
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2015
• 资助国家: 美国
• 起止时间: 2015-04-15 至 2016-03-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1539023&HistoricalAwards=false
• 关键词: Construction; gas; handling; system; measurement

This laboratory took delivery of the world?s largest gas-source isotope ratio mass spectrometer. The instrument, referred to as the "Panorama", offers by far the greatest mass resolution of any gas-source isotope ratio instrument. The principle investigators will use the unique capabilities of the new instrument for tracing the provenance of methane gas. This award will provide funding to construct the infrastructure to allow them to process methane gases for isotopic analysis. The benefits of the research program extend beyond basic research to include numerous (and some unforeseen) practical applications that benefit society in general. For example, methane is 20 times more effective as a greenhouse gas than is carbon dioxide. An improved understanding of the sources and sinks of atmospheric methane is of clear benefit to society in providing a means for understanding the causes of variations in atmospheric methane concentrations.Identifying the sources of methane gas with certainty in any particular occurrence has been until now, inexact, but the use of isotopic bond ordering holds the promise of greater certainty. The origins of natural gas and the highly uncertain global budget of methane gas in the atmosphere are two target applications of this novel approach for tracing the sources of methane. Bond ordering will afford temperatures of formation where thermodynamic equilibrium applies. Analyzing both 13CH3D/12CH4 and 12CH2D2/12CH4 will provide evidence for mixing of sources where it has occurred, thus disambiguating the meaning of standard bulk isotope ratios. These isotopologue ratios are also predicted to provide diagnostic patterns for different kinetic pathways involving transport, formation, or destruction of methane.

这个实验室接管了整个世界？S最大气源同位素比质谱仪。该仪器被称为“全景”，提供了迄今为止所有气源同位素比仪器中最大的质量分辨率。主要研究人员将利用新仪器的独特功能来追踪甲烷气体的来源。该奖项将提供资金建设基础设施，使他们能够处理甲烷气体进行同位素分析。该研究项目的好处超出了基础研究，包括许多（和一些不可预见的）实际应用，造福于整个社会。例如，甲烷作为温室气体的效果是二氧化碳的20倍。提高对大气甲烷源和汇的了解显然对社会有益，因为它为了解大气甲烷浓度变化的原因提供了一种手段。到目前为止，在任何特定的地点确定甲烷气体的来源都是不精确的，但使用同位素键排序有希望获得更大的确定性。天然气的来源和高度不确定的大气中甲烷气体的全球预算是这种追踪甲烷来源的新方法的两个目标应用。化学键的顺序将提供适用于热力学平衡的形成温度。对13CH3D/12CH4和12CH2D2/12CH4进行分析，将为发生混合源的地方提供证据，从而消除标准体积同位素比含义的歧义。这些同位素比率也被预测为不同的动力学途径提供诊断模式，包括甲烷的运输、形成或破坏。