Sesquiterpenoid Compound Emissions from Vegetation--Chemical Analysis Technique for Ambient Measurements of the Contribution to the Formation of Ozone and Aerosols

许多研究在植物排放物中发现了倍半萜类化合物，并怀疑它们参与了大气中的气溶胶形成过程和多相反应。 由于缺乏分析能力和环境测量，了解这些化合物在大气过程中的作用面临挑战。 在本计画中，将建立一个以毛细管扩散为基础的校正系统，以产生定义明确的倍半萜类化合物气相浓度。 气相色谱/火焰离子化检测仪器将对系统输出进行自动和连续的在线监测。 校准系统的设计将允许对分析物添加潜在的分析干扰，例如水和臭氧，以研究这些大气成分对SQT回收率以及分析精密度和准确度的影响。 将研究采用袋和罐中全空气采样技术以及固体吸附柱上收集的采样、储存和分析方法的分析适用性。 这些研究将为环境测量和通量研究制定可靠测量空气中倍半萜类化合物的方法。

Sesquiterpenoid compounds have been identified in plant emissions in numerous studies and are suspected to participate in aerosol-forming processes and heterogeneous reactions in the atmosphere. Understanding the role of these compounds in atmospheric processes is challenged by the lack of analytical capabilities and ambient measurements. In this project, a capillary diffusion-based calibration system will be built to generate well-defined gas-phase concentrations of sesquiterpenoid compounds. A gas chromatography/flame ionization detection instrument will provide automated and continuous on-line monitoring of the system output. The calibration system will be designed to allow addition of potential analytical interferences to the analytes, such as water and ozone, in order to study the effects of these atmospheric components on the SQT recovery rate and the analytical precision and accuracy. Sampling, storage and analysis methods using either whole air sampling techniques into bags and canisters and collection onto solid adsorption cartridges will be investigated for their analytical suitability. These studies will develop methodology for the reliable measurement of sesquiterpenoid compounds in air for ambient measurements and flux studies.