Collaborative Research: A Nitrate Radical Oxidation Flow Reactor: Development and Use in Laboratory and Field Studies

合作研究：硝酸根氧化流动反应器：实验室和现场研究的开发和使用

• 批准号: 2131458
• 负责人: Pengfei Liu
• 金额: $ 33.44万
• 依托单位: Georgia Tech Research Corporation
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2022
• 资助国家: 美国
• 起止时间: 2022-02-15 至 2025-01-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2131458&HistoricalAwards=false
• 关键词: Collaborative; Research; Nitrate; Radical; Oxidation

This project is a collaborative effort to develop a new tool to study of the role of nitrogen in nighttime chemistry in the atmosphere. A field-deployable Oxidation Flow Reactor (OFR) will be built to provide new insights into nitrate radical (NO3)-initiated atmospheric oxidative aging processes. Experiments will be conducted in both environmental chambers and OFRs to distinguish the relative contributions of hydroxyl (OH) and nitrate radicals to the formation of oxidized volatile organic compounds (OVOCs) and secondary organic aerosol (SOA). These species can have widespread impacts on weather, climate, and human health.This effort addresses the following questions: (1) To what extent can OFRs reproducibly generate OVOCs and SOA from VOC + NO3 reactions? (2) Are unique oxidation products formed from sequential multi-day oxidative aging processes that can be used to trace these processes in the atmosphere? (3) What is the OVOC and SOA formation potential of ambient air exposed to NO3 versus OH radicals in an OFR, and how does it change as a function of integrated oxidant exposure and source region? (4) Can NO3-OFR perturbations of ambient air enable clearer delineation between nighttime NO3 and O3 chemistry, especially with respect to identifying non-nitrogen-containing NO3 oxidation products?This project supports several graduate students and an early career researcher.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.

该项目是一项合作项目，旨在开发一种新工具来研究氮在大气夜间化学中的作用。将建造一个可现场部署的氧化流反应器（OFR），为硝酸根（NO3）引发的大气氧化老化过程提供新的见解。实验将在环境室和 OFR 中进行，以区分羟基 (OH) 和硝酸根对氧化挥发性有机化合物 (OVOC) 和二次有机气溶胶 (SOA) 形成的相对贡献。 这些物种会对天气、气候和人类健康产生广泛的影响。这项工作解决了以下问题：(1) OFR 在多大程度上可以通过 VOC + NO3 反应重复生成 OVOC 和 SOA？ (2) 连续多天的氧化老化过程是否形成独特的氧化产物，可用于追踪大气中的这些过程？ (3) 暴露于 NO3 的环境空气相对于 OFR 中的 OH 自由基的环境空气的 OVOC 和 SOA 形成潜力是多少，以及它作为综合氧化剂暴露和源区域的函数如何变化？ (4) 环境空气的 NO3-OFR 扰动能否更清晰地划分夜间 NO3 和 O3 化学，特别是在识别不含氮的 NO3 氧化产物方面？该项目支持几名研究生和一名早期职业研究人员。该奖项反映了通过使用基金会的智力价值和更广泛的影响审查标准进行评估，NSF 的法定使命被认为值得支持。