RUI: Chemical phenomena of complex carbonyl-ammonium aqueous aerosol mimics

RUI：复杂的羰基铵水气溶胶的化学现象模拟

• 批准号: 2221933
• 负责人: Melissa Galloway
• 金额: $ 32.72万
• 依托单位: Lafayette College
• 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: 2022-08-01 至 2025-07-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2221933&HistoricalAwards=false
• 关键词: RUI; Chemical; phenomena; complex; carbonyl

This Research in Undergraduate Institutions (RUI) project is focused on improving the understanding of condensed-phase reactions that lead to the formation of brown carbon in the atmosphere. The proposed research effort will explore the mechanistic and kinetic changes that occur through the aqueous reactions of carbonyls and ammonium sulfate. This work includes a systematic study of light absorption as a function of composition and could lead to improved predictions of brown carbon formation in atmospheric particles.This effort involves research on the cross-reactions of ammonium sulfate with paired α-difunctional carbonyls (glycolaldehyde, glyoxal, and methylglyoxal) to determine the effects of carbonyl ratio and identity on product formation, brown carbon light absorption, and reaction rates. The proposed work aims to answer the following key scientific questions: (1) How do cross-reactions of carbonyl compounds with ammonium change product composition? (2) How do light absorption properties of the product mixtures change as a function of cross-reaction between carbonyls? (3) How do product formation and chromophoricity change as additional complexity is added to mixture? Supercritical fluid chromatography-mass spectrometry and UV-visible spectroscopy will be utilized for this study.Undergraduate research students will perform the laboratory experiments and will be involved in all aspects of the data workup and the presentation of the data.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.

该本科院校研究 (RUI) 项目的重点是提高对导致大气中棕色碳形成的凝聚相反应的理解。拟议的研究工作将探索羰基化合物和硫酸铵的水反应所发生的机械和动力学变化。这项工作包括对光吸收作为组成函数的系统研究，并可能改进对大气颗粒中棕色碳形成的预测。这项工作涉及硫酸铵与配对α-双官能羰基（乙醇醛、乙二醛和甲基乙二醛）的交叉反应，以确定羰基比例和特性对产物形成棕色碳的影响 光吸收和反应速率。拟议的工作旨在回答以下关键科学问题：（1）羰基化合物与铵的交叉反应如何改变产物组成？ (2) 产品混合物的光吸收特性如何随着羰基之间的交叉反应而变化？ (3) 当混合物的复杂性增加时，产物形成和发色如何变化？这项研究将采用超临界流体色谱-质谱法和紫外可见光谱法。本科研究生将进行实验室实验，并将参与数据处理和数据呈现的各个方面。该奖项反映了 NSF 的法定使命，并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，被认为值得支持。