Composition of Individual Particles Segregated According to Electrical Mobility, Hygroscopicity, Volatility and Mass

根据电迁移率、吸湿性、挥发性和质量分离的单个颗粒的组成

• 批准号: 0096555
• 负责人: Peter McMurry
• 金额: $ 61.52万
• 依托单位: University of Minnesota-Twin Cities
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2001
• 资助国家: 美国
• 起止时间: 2001-06-15 至 2005-11-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0096555&HistoricalAwards=false
• 关键词: Composition; Individual; Particles; Segregated; According

A commercially available Aerosol Time of Flight Mass Spectrometer (ATOFMS) will be used to measure the composition of particles that have been preclassified according to various physical properties. These measurements will provide new insights into the physical/chemical properties and mixing characteristics of atmospheric particles. Such information is valuable for interpreting data from more conventional instrumentation and can be used to evaluate state-of-the-art models that describe the evolution of aerosols from various sources as a function of size and composition. Particles will be classified according to electrical mobility (size) with a differential mobility analyzer (DMA), size and hygroscopicity with a tandem differential mobility analyzer (TDMA), or size with a DMA or TDMA and mass with an Aerosol Particle Mass Analyzer (APM). The effect of volatilization on composition will be studied by heating size-classified particles before analyzing them with the ATOFMS.The first two years of the project will focus on studies with laboratory aerosols of known composition and on the development of sampling protocols for field measurements. An intensive field campaign will be carried out in Atlanta, GA. This project represents a collaboration between the University of Minnesota and Carleton College.

市售的气溶胶飞行时间质谱仪（ATOFMS）将用于测量根据各种物理特性预先分类的颗粒的成分。这些测量将为大气颗粒的物理/化学特性和混合特性提供新的见解。此类信息对于解释来自更传统仪器的数据非常有价值，并且可用于评估最先进的模型，这些模型将各种来源的气溶胶的演变描述为尺寸和成分的函数。将使用差分迁移率分析仪 (DMA) 根据电迁移率（尺寸）对颗粒进行分类，使用串联差分迁移率分析仪 (TDMA) 根据尺寸和吸湿性进行分类，或者使用 DMA 或 TDMA 根据尺寸和气溶胶颗粒质量分析仪 (APM) 的质量对颗粒进行分类。在使用 ATOFMS 分析颗粒之前，将通过加热按尺寸分类的颗粒来研究挥发对成分的影响。该项目的前两年将重点研究已知成分的实验室气溶胶，并开发用于现场测量的采样协议。密集的实地活动将在佐治亚州亚特兰大进行。该项目代表了明尼苏达大学和卡尔顿学院之间的合作。