Development of an Integrated System for Analyses of Aerosol Composition and Chemistry

气溶胶成分和化学分析集成系统的开发

• 批准号: 9977745
• 负责人: Darin Toohey
• 金额: $ 56万
• 依托单位: University of Colorado at Boulder
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1999
• 资助国家: 美国
• 起止时间: 1999-09-15 至 2004-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9977745&HistoricalAwards=false
• 关键词: Development; Integrated; System; Analyses; Aerosol

This Major Research Instrumentation (MRI) proposal is to develop a comprehensive laboratory system to characterize the composition and chemistry of aerosols. Three analytical subsystems will be assembled and integrated into a unique and powerful system for studying the composition, size distribution, and reactivity of aerosol particles believed to be important in the earth's atmosphere. Particles of controlled size and chemical composition will be generated with commonly used techniques such an atomizer and a fluidized bed nebulizer. The aerosols will be characterized by differential mobility analyzers and aerodynamic particle sizers and subsequently injected into a pressure- and temperature-controlled flow system similar to those employed for studies of highly reactive radicals and weakly bound species. In this reaction chamber the particles will be exposed to variable concentrations of gases like nitric acid, water vapor, inorganic acids, and organic compounds. The gas-phase composition of stable species (both reactants and products) will be monitored by tunable diode laser spectroscopy (TDLS), chemical ionization mass spectrometry (CIMS), and Fourier transform infrared spectroscopy (FTIR). The particle number and size distributions will be monitored in situ by optical scattering techniques. Finally, the particles will be focused through an aerodynamic inlet into a vacuum chamber where they will be sized by aerosol time-of-flight and their composition determined by mass spectrometry. The long-term goal of this project is to establish a multidisciplinary center for aerosol science which will foster close collaborations between investigators in universities, national laboratories, and industry.

这项主要研究仪器（MRI）提案是开发一个综合的实验室系统来表征气溶胶的组成和化学。三个分析子系统将被组装并集成到一个独特而强大的系统中，用于研究地球大气中重要的气溶胶颗粒的组成、大小分布和反应性。使用常用的技术，如雾化器和流化床雾化器，将产生大小和化学成分可控的颗粒。这些气溶胶将通过微分迁移率分析仪和空气动力学粒度仪进行表征，随后注入压力和温度控制的流动系统，类似于用于研究高活性自由基和弱结合物质的流动系统。在这个反应室中，颗粒将暴露在不同浓度的气体中，如硝酸、水蒸气、无机酸和有机化合物。稳定物质（包括反应物和生成物）的气相组成将通过可调谐二极管激光光谱（TDLS）、化学电离质谱（CIMS）和傅里叶变换红外光谱（FTIR）进行监测。粒子数量和大小分布将通过光学散射技术在现场监测。最后，这些微粒将通过一个空气动力学入口被集中到一个真空室，在那里它们将通过气溶胶的飞行时间被确定大小，并通过质谱测定它们的成分。该项目的长期目标是建立一个多学科的气溶胶科学中心，促进大学、国家实验室和工业界的研究人员之间的密切合作。