Illuminating an 8 m3 environmental chamber for atmospheric photochemistry for air quality

为 8 m3 环境室提供大气光化学照明，以改善空气质量

• 批准号: RTI-2023-00192
• 负责人: BorduasDedekind, Nadine
• 金额: $ 10.9万
• 依托单位: University of British Columbia
• 依托单位国家: 加拿大
• 项目类别: Research Tools and Instruments
• 财政年份: 2022
• 资助国家: 加拿大
• 起止时间: 2022-01-01 至 2023-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=747792
• 关键词: Illuminating; m3; environmental; chamber; atmospheric

Atmospheric chemists and exposure scientists simulate the atmosphere in the laboratory to study chemical transformations related to human health and climate. The `round bottom flask' and `reaction vessel' for atmospheric studies are environmental chambers. The requested infrastructure is a pioneering light emitting diodes (LEDs) setup to irradiate an environmental chamber for photochemical studies. Last year, Dr. Borduas-Dedekind built a basic 8m3 cubic environmental chamber in her unique high-ceiling lab in Chemistry at the University of British-Columbia. However, this chamber urgently needs the requested lighting infrastructure to launch an interdisciplinary research program studying photochemical processes in the atmosphere, such as OH radical oxidation and smog formation. Without these lights, current HQP in Chemistry and Medicine at UBC and at Vancouver Island University cannot move forward with their research projects on evaluating the fate of pollutants under simulated sunlight. The funds will support a first-of-its-kind large environmental chamber illuminated by LEDs and capable of studying stratospheric, tropospheric and indoor air chemistry within the same infrastructure. The environmental chamber will operate narrow and tunable emission wavelengths of 275, 300, 365, 400, 500 and 600 nm using custom LEDs (Violumas), enabling the use of one, some or all wavelengths for controlled irradiance of outdoor and indoor processes. This infrastructure will be used daily, is intended to have a lifetime of at least 2 decades and is considered to be low risk and high impact. There currently exists no comparable chamber at UBC or in Canada with the specifications we urgently need: large (for gas phase and exposure research), modular (for batch mode and continuous mode experiments) and lit (for OH radical and NOx chemistry). Thus, our modular LED environmental chamber will become the center for air quality collaborative research programs at UBC to study the fate of atmospheric molecules and train the next generation of scientists. The proposed environmental chamber will enable the study of emergent topics: from the chemical composition of cannabis emissions to wildfire photochemical changes to biogeochemical cycling of selenium and to personal cloud chemistry. The team of co-applicants at UBC are experts in gas-phase chemistry and photochemistry (Borduas-D.), aerosol chemistry and physics (Bertram), contaminant fate and mobile measurements (Krogh), air pollution exposure in athletes (Koehle), ensuring the success of the construction, operation and HQP training of the illuminated environmental chamber. The research output will include high quality data relevant for government and industry stakeholders to predict the fate of pollutants and exposure outcomes. Understanding the chemical reactivity and transformation products of compounds under simulated sunlight conditions is necessary to predicting, regulating, and mitigating exposure for Canadians.

大气化学家和暴露科学家在实验室中模拟大气，以研究与人类健康和气候相关的化学变化。用于大气研究的“圆底烧瓶”和“反应容器”是环境室。所需的基础设施是一个开创性的发光二极管 (LED) 设置，用于照射环境室以进行光化学研究。去年，Borduas-Dedekind 博士在不列颠哥伦比亚大学化学系独特的高天花板实验室中建造了一个基本的 8 立方米立方环境室。然而，该室迫切需要所需的照明基础设施来启动一项跨学科研究计划，研究大气中的光化学过程，例如 OH 自由基氧化和烟雾形成。如果没有这些灯，目前 UBC 和温哥华岛大学的化学和医学总部就无法推进评估污染物在模拟阳光下的命运的研究项目。这些资金将支持建造首个由 LED 照明的大型环境室，能够在同一基础设施内研究平流层、对流层和室内空气化学。该环境室将使用定制 LED (Violumas) 运行 275、300、365、400、500 和 600 nm 的窄且可调谐发射波长，从而能够使用一种、部分或所有波长来控制室外和室内过程的辐照度。该基础设施将每天使用，预计使用寿命至少为 20 年，并且被认为风险低、影响大。目前，UBC 或加拿大没有可比的室具有我们迫切需要的规格：大型（用于气相和暴露研究）、模块化（用于批量模式和连续模式实验）和点燃（用于 OH 自由基和 NOx 化学）。因此，我们的模块化 LED 环境室将成为 UBC 空气质量合作研究项目的中心，以研究大气分子的命运并培训下一代科学家。拟议的环境室将能够研究新兴主题：从大麻排放的化学成分到野火光化学变化，再到硒的生物地球化学循环和个人云化学。 UBC 的共同申请人团队是气相化学和光化学 (Borduas-D.)、气溶胶化学和物理学 (Bertram)、污染物归宿和移动测量 (Krogh)、运动员空气污染暴露 (Koehle) 等领域的专家，确保照明环境舱的建造、运行和总部培训的成功。研究成果将包括与政府和行业利益相关者相关的高质量数据，以预测污染物的命运和暴露结果。了解化合物在模拟阳光条件下的化学反应性和转化产物对于预测、调节和减轻加拿大人的暴露是必要的。