Collaborative Research: Towards a Better Understanding of the Atmospheric Fate of PFAS

合作研究：更好地了解 PFAS 在大气中的归宿

• 批准号: 2220919
• 负责人: Jennifer Faust
• 金额: $ 2.44万
• 依托单位: College of Wooster
• 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: 2022-09-01 至 2025-08-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2220919&HistoricalAwards=false
• 关键词: Collaborative; Research; Towards; Better; Understanding

Per- and Poly-fluorinated alkyl substances (PFAS), have been used in many industrial applications (e.g., non-stick coating) as a chemically and thermally stable compound. However, these compounds have known human health impacts, and thus have been largely phased out. Nonetheless, PFAS compounds are still detected in air and water, and there exists a data gap in our understanding of the chemical degradation and environmental fate of PFAS compounds. This work will perform laboratory experiments in order to fill this data gap and improve out understanding of PFAS chemistry – with a focus on perfluorooctanoic acid (PFOA) – and the likely impact of PFAS compounds on the environment and human health.This proposed work has three primary research goals: (1) to quantify the thermodynamic properties relevant for atmospheric phase partitioning of PFAS and PFAS-replacing chemicals; (2) to estimate the atmospheric lifetime of these chemicals against OH chemistry; and (3) to investigate reaction mechanisms of these chemicals. Additionally, this proposed work has an educational objective to establish an exchange to enable undergraduate students to broaden their educational experience by conducting summer research among the collaborative institutions. This proposed work will conduct three primary tasks to reach these objectives. First, the team will quantify the thermodynamic properties – namely saturation vapor pressure, Henry volatility, and acid dissociation constants – that influence the phase partitioning of PFAS. Second, they will conduct multiple oxidation flow reactor experiments to constrain the impact of OH radical chemistry on PFAS. Third, they will estimate rate constants of PFAS against OH and develop potential reaction mechanisms.This project supports one postdoctoral 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.

在许多工业应用（例如，不粘涂层）中用作化学和热稳定的化合物中，使用的烷基物质（PFA）已被用于许多工业应用（例如，不粘涂层）。但是，这些化合物已经知道人类健康的影响，因此在很大程度上被淘汰了。但是，在空气和水中仍发现了PFAS化合物，并且在我们对PFAS化合物的化学降解和环境命运的理解中存在数据差距。工作将进行实验室实验，以填补这一数据差距并提高对PFAS化学的了解 - 重点是全氟辛酸（PFOA） - PFA化合物对环境和人类健康的可能影响可能影响。这项拟议的工作具有三个主要的研究目标：（1）量化对热力学物质的化学物质相关的PFF和PFS pfas pfas和Pfas的pfas和Pf， （2）估计这些化学物质对OH化学的大气寿命； （3）研究这些化学物质的反应机制。此外，这项拟议的工作具有教育目标，可以建立交流，以使本科生通过在协作机构之间进行夏季研究来扩大他们的教育经验。这项拟议的工作将执行三个主要任务以实现这些目标。首先，团队将量化热力学特性 - 即影响PFAS相分配的热力学蒸气压，亨利的波动性和酸解离常数。其次，他们将进行多种氧化流动反应器实验，以限制OH自由基化学对PFA的影响。第三，他们将估算PFA的速率常数针对OH并开发潜在的反应机制。该项目支持一位博士后研究员。该奖项反映了NSF的法定任务，并被认为是通过基金会的知识分子优点和更广泛的影响来评估的评估值得支持的。