Collaborative Research: A Halogen Oxidant Flow Reactor: Development and Use in Laboratory and Field Studies

合作研究：卤素氧化剂流动反应器：实验室和现场研究的开发和使用

基本信息

批准号：
1934352
负责人：
Andrew Lambe
金额：
$ 27.88万
依托单位：
Aerodyne Research Inc
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
2019
资助国家：
美国
起止时间：
2019-12-01 至 2023-11-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1934352&HistoricalAwards=false
关键词：
Collaborative Research Halogen Oxidant Flow

项目摘要

This project is a collaborative effort among three institutions to develop a technique for studying chemical reactions in the atmosphere that involve halogens, such as chlorine and bromine. Recently, the lead scientist on this project developed a similar technique, using an oxidation flow reactor (OFR), for the study of atmospheric reactions involving the hydroxyl radical, the most active oxidizing species in the atmosphere. The development of the OFR has advanced significantly the ability of scientists to study and understand atmospheric reaction processes in the laboratory.The overall goals of this research are to develop methods to generate chlorine (Cl) and bromine (Br) in OFRs, deploy a prototype halogen OFR along with state-of-the-art mass spectrometry techniques in source regions with potential Cl/Br influence, and conduct OFR and environmental chamber (EC) intercomparison studies of the chemical composition and yields of products generated from Cl oxidation of biogenic and anthropogenic precursors. These studies will evaluate the ability of OFRs to conduct laboratory and field studies investigating Cl/Br-initiated oxidative aging processes.The effort is based on investigating the following questions: (1) What is the oxygenated volatile organic compound (OVOC) and secondary organic aerosol (SOA) formation potential of ambient air exposed to halogen atoms in an OFR? How does it change as a function of halogen type, integrated oxidant exposure and source regions? (2) Is the yield and chemical composition of laboratory SOA generated by VOC + Cl reactions independent of the method used to generate it (OFR or EC)? (3) How does the chemical composition and yield of laboratory and ambient OVOC/SOA compare when initiated by Cl/Br versus hydroxyl radical oxidation? Does the multi-oxidant-OFR approach provide additional constraints on OVOC/SOA precursors?This project includes laboratory training for undergraduate and graduate students and a postdoctoral research fellow.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.

该项目是三个机构之间的合作努力，以开发一种研究涉及卤素（例如氯和溴）的化学反应的技术。最近，该项目的主要科学家使用氧化流动反应器（OFR）开发了类似的技术，用于研究涉及羟基自由基的大气反应，这是大气中最活跃的氧化物种。 The development of the OFR has advanced significantly the ability of scientists to study and understand atmospheric reaction processes in the laboratory.The overall goals of this research are to develop methods to generate chlorine (Cl) and bromine (Br) in OFRs, deploy a prototype halogen OFR along with state-of-the-art mass spectrometry techniques in source regions with potential Cl/Br influence, and conduct OFR and environmental chamber (EC) intercomparison studies of the chemical composition以及由CL氧化产生的生物和人为前体氧化产生的产物。 These studies will evaluate the ability of OFRs to conduct laboratory and field studies investigating Cl/Br-initiated oxidative aging processes.The effort is based on investigating the following questions: (1) What is the oxygenated volatile organic compound (OVOC) and secondary organic aerosol (SOA) formation potential of ambient air exposed to halogen atoms in an OFR?它如何随卤素类型，综合氧化剂暴露和源区域的变化而变化？（2）VOC + Cl反应产生的实验室SOA的产量和化学成分与（OFR或EC）所用的方法无关？（3）当通过CL/BR与羟基自由基氧化引发时，实验室和环境OVOC/SOA的化学组成和产量如何？多氧化剂的OFR方法是否在OVOC/SOA前体中提供了其他约束？该项目包括针对本科生和研究生的实验室培训，以及博士后研究员。本奖奖反映了NSF的法定任务，并被认为是通过基金会的知识和更广泛的影响来通过评估来获得的支持，并被认为是值得的。