Atmospheric Particulate Organic Nitrates by Photoelectron Resonance Capture Ionization-Mass Spectrometry

光电子共振捕获电离质谱法测定大气颗粒物有机硝酸盐

• 批准号: 0440074
• 负责人: Giuseppe Petrucci
• 金额: --
• 依托单位: University of Vermont & State Agricultural College
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2005
• 资助国家: 美国
• 起止时间: 2005-02-01 至 2009-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0440074&HistoricalAwards=false
• 关键词: Atmospheric; Particulate; Organic; Nitrates; Photoelectron

This project develops an analytical system using photoelectric resonance electron capture ionization mass spectrometry (PERCI-MS), a technique based on soft-ionization which minimizes the fragmentation of the analyte ions. The system design will enable the measurement of nitrated organics including nitro-polycyclic aromatic hydrocarbons (NPAHs) in atmospheric particulates, useful in gauging the health effects and environmental impact of organics bound to ambient particulate matter. Resonance electron capture profiles will be measured for a number of nitrated organic compounds in order to study radical-initiated particle-phase mechanisms of NPAH formation. In collaboration with the University of North Carolina, an outdoor reaction chamber will be used to analyze organic nitrates formed during secondary aerosol formation. The PERCI-MS system will also be used to make measurements of ambient NPAHs during selected field deployments. The broader impacts of this project include direct relevance to atmospheric processes important to air quality and human health, the value of developing this soft-ionization technique as an analytical tool for atmospheric trace compounds, and support of education and professional development of undergraduate and graduate students in an important area of scientific research. The Division of Atmospheric Sciences Atmospheric Chemistry Program in the Geosciences Directorate and the Division of Chemistry Analytical and Surface Chemistry Cluster in the Mathematical and Physical Sciences Directorate support this award jointly.

本项目开发了一种使用光电共振电子捕获电离质谱（PERCI-MS）的分析系统，该技术基于软电离，最大限度地减少了分析物离子的碎片。 该系统的设计可量度大气颗粒物中的硝化有机物，包括硝基多环芳香族碳氢化合物（NPAH），有助量度与周围颗粒物结合的有机物对健康和环境的影响。 共振电子捕获配置文件将测量一些硝化有机化合物，以研究自由基引发的颗粒相NPAH形成的机制。 与北卡罗来纳州大学合作，将使用一个室外反应室来分析二次气溶胶形成过程中形成的有机硝酸盐。 PERCI-MS系统还将用于在选定的实地部署期间测量环境中的非多环芳烃。 该项目的更广泛影响包括与对空气质量和人类健康至关重要的大气过程的直接相关性，开发这种软电离技术作为大气痕量化合物分析工具的价值，以及支持本科生和研究生在重要科学研究领域的教育和专业发展。 地球科学理事会大气科学部大气化学计划和数学和物理科学理事会化学分析和表面化学集群部共同支持该奖项。