Collaborative Research: Photochemical Silicon Aerosols: Establishing Atmospheric Sources and Significance

合作研究：光化学硅气溶胶：确定大气来源和意义

• 批准号: 2028764
• 负责人: Charles Stanier
• 金额: $ 85.58万
• 依托单位: University of Iowa
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2021
• 资助国家: 美国
• 起止时间: 2021-02-01 至 2025-01-31
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2028764&HistoricalAwards=false
• 关键词: Collaborative; Research; Photochemical; Silicon; Aerosols

This research is focused on improving the understanding of the chemical and physical transformations of volatile methyl siloxanes (VMS) in the atmosphere. Volatile methyl siloxanes (VMS) are high production chemicals used in many personal care products such as deodorants and lotions. The results of this research are expected to lead to a better assessment of the fate and transport issues important for understanding the environmental and health consequences of the increasing use of VMS.The objective of this project is to assess the chemical speciation and abundance of oxidized VMS in the laboratory and in ambient atmospheric aerosols. This research is expected to confirm the presence of particles formed from ambient organosilicon compounds, establish aerosol yields at near-ambient conditions under urban and remote oxidation conditions, determine the best aerosol tracer compounds for this class of secondary organic aerosols, and integrate the results of this effort into a state-of-science photochemical grid model that will enable the prediction of the fate of VMS upon oxidation at scales ranging from urban airshed to continental.This research includes laboratory studies at the University of Iowa using an oxidative flow reactor (OFR) and experiments in the University of Colorado environmental chambers to probe the oxidation chemistry of VMS. Outdoor ambient sampling for VMS and its gas- and condensed-phase oxidation products will be conducted during a four-week summertime deployment in the New York City metropolitan area. The scientific insights gained from this research will be incorporated into the Community Multiscale Air Quality (CMAQ) modeling system that will lead to better predictions of aerosol formation from personal care products.This project is jointly funded by the NSF Atmospheric Chemistry Program and the Established Program to Stimulate Competitive Research (EPSCoR).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.

这项研究的重点是改善对大气中挥发性甲基硅氧烷（VM）的化学和物理转化的理解。挥发性甲基硅氧烷（VM）是许多个人护理产品（例如除臭剂和乳液）中使用的高生产化学物质。这项研究的结果有望更好地评估命运和运输问题对于理解VM使用增加的环境和健康后果至关重要。该项目的目的是评估实验室和环境大气中的氧化VM的化学物种形成和丰度。预计这项研究将确认存在由环境有机硅化合物形成的颗粒，在城市和远程氧化条件下在近乎镜头的条件下建立气溶胶产量，确定该类别的二级有机气溶胶的最佳气溶胶示踪剂化合物，并将这种努力纳入正式的网格模型中，以估计该量子的范围，并将其整合到稳定的模型中。从Urban Airshed到大陆。这项研究包括使用氧化流动反应器（OFR）的爱荷华大学的实验室研究，以及科罗拉多大学环境室的实验，以探测VMS的氧化化学。 VM及其气体和冷凝相氧化产品的室外环境采样将在纽约市大都市地区进行为期四周的夏季部署。从这项研究中获得的科学见解将纳入社区多尺度空气质量（CMAQ）建模系统中，该系统将更好地预测个人护理产品的气溶胶形成。该项目由NSF大气化学计划共同资助，由NSF大气化学计划和既定计划的既定计划（EPSCOR）进行了支持，并通过竞争性的奖项来反映了NSF的宣传。和更广泛的影响审查标准。