Shining light on the sources, sinks and concentrations of singlet oxygen in the atmosphere
揭示大气中单线态氧的来源、汇和浓度
基本信息
- 批准号:RGPIN-2021-02937
- 负责人:
- 金额:$ 2.48万
- 依托单位:
- 依托单位国家:加拿大
- 项目类别:Discovery Grants Program - Individual
- 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:
- 关键词:
项目摘要
The Earth's atmosphere is exclusively oxidizing, and consequently oxidation reactions govern the fate of most organic molecules in the gas and particle phases. The concentration, speciation and reactivity of atmospheric oxidants are necessary to predict the fate of atmospheric pollutants. My long-term research program centers on studying atmospheric oxidants as well as their oxidation mechanisms, with a short-term focus on an understudied and arguably underappreciated oxidant in the context of atmospheric chemistry: singlet oxygen (1O2) the first excited state of ground state triplet molecular oxygen. 1O2 is a well-known excited state molecule: in biology for photodynamic therapy for cancer treatment, in organic chemistry for enhanced reactivity in oxidation and cylcoaddition reactions, and in surface waters as a key oxidant in determining the fate of pollutants. The key ingredients necessary for the production of 1O2 in surface waters include a sensitizer, oxygen and light - all are indeed present in the atmosphere, yet only a handful of reports have described atmospheric 1O2. My proposed research program builds on recent work from my group demonstrating the efficacy of aqueous organic aerosols to act as sensitizers for 1O2 production under sunlit conditions. My team will elucidate the sources (Task 1) and sinks (Task 2) of 1O2 in organic aerosols in indoor and outdoor air, and will undertake groundbreaking studies on 1O2's gas phase chemistry (Task 3). Task 1 addresses two outdoor air projects (MSc1, MSc2) and an indoor air program (PhD1), kick-starting a burgeoning field of indoor air photochemistry. Task 2 will elucidate the sinks of 1O2 in atmospherically-relevant aqueous organic aerosol conditions (PhD2). Furthermore, Task 3 will demonstrate that 1O2 can partition to the gas phase and have unprecedented impact on gas-phase chemical reactions (Postdoc). These three tasks contribute to three impact goals: (A) predict 1O2 steady-state concentrations and quantum yields within organic aerosols; (B) compare the importance of 1O2 reactivity with other oxidants; and (C) demonstrate the presence and impact of 1O2 in the gas phase for the first time. Overall, this research program will train 1 postdoc, 2 PhDs, 2 MSc, and 10 undergraduates and is designed for high training value. Indeed, it is challenging, innovative, and impactful, yet feasible and designed with risk mitigation and EDI strategies. HQP will lead projects, use state-of-the-art photochemistry techniques and participate in multidisciplinary collaborations as part of a unique HQP training program under my leadership. The original scientific research output generated will provide quantitative data including concentrations, rate constants, product distributions and chemical mechanisms to improve fate modelling of key air quality components. This output will support the development of regulatory guidelines by government agencies, Environment and Climate Change Canada and Health Canada.
地球的大气层完全是氧化性的,因此氧化反应决定了大多数有机分子在气相和颗粒相的命运。大气中氧化剂的浓度、形态和反应性是预测大气污染物归宿的必要条件。我的长期研究计划集中在研究大气氧化剂以及它们的氧化机制,短期重点是在大气化学背景下研究不足和可以说是低估的氧化剂:单线态氧(1 O2)基态三重态分子氧的第一激发态。1 O2是一种众所周知的激发态分子:在生物学中用于癌症治疗的光动力疗法,在有机化学中用于增强氧化和环加成反应的反应性,以及在表面沃茨中作为决定污染物命运的关键氧化剂。在地表沃茨中产生1 O2所需的关键成分包括敏化剂、氧气和光--所有这些都确实存在于大气中,但只有少数报告描述了大气中的1 O2。我提出的研究计划建立在我的团队最近的工作基础上,证明了水性有机气溶胶在阳光照射条件下作为1 O2生产敏化剂的功效。我的团队将阐明室内和室外空气中有机气溶胶中1 O2的来源(任务1)和汇(任务2),并将对1 O2的气相化学进行突破性研究(任务3)。任务1涉及两个室外空气项目(MSc 1,MSc 2)和一个室内空气项目(PhD 1),启动了室内空气光化学的新兴领域。任务2将阐明1 O2在大气相关的含水有机气溶胶条件下的汇(PhD 2)。此外,任务3将证明1 O2可以分配到气相中,并对气相化学反应产生前所未有的影响。这三项任务有助于实现三个影响目标:(A)预测有机气溶胶中1 O2的稳态浓度和量子产率;(B)比较1 O2与其他氧化剂反应的重要性;(C)首次证明1 O2在气相中的存在和影响。总体而言,本研究计划将培养1名博士后,2名博士,2名硕士和10名本科生,旨在提高培训价值。事实上,它具有挑战性,创新性和影响力,但可行,并采用风险缓解和EDI策略设计。HQP将领导项目,使用最先进的光化学技术,并参与多学科合作,作为我领导下的独特HQP培训计划的一部分。所产生的原始科学研究成果将提供定量数据,包括浓度、速率常数、产物分布和化学机制,以改进关键空气质量成分的归宿建模。这一产出将支持政府机构、加拿大环境和气候变化部以及加拿大卫生部制定监管准则。
项目成果
期刊论文数量(0)
专著数量(0)
科研奖励数量(0)
会议论文数量(0)
专利数量(0)
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BorduasDedekind, Nadine其他文献
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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 - 财政年份:2022
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Shining light on the sources, sinks and concentrations of singlet oxygen in the atmosphere
揭示大气中单线态氧的来源、汇和浓度
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Shining light on the sources, sinks and concentrations of singlet oxygen in the atmosphere
揭示大气中单线态氧的来源、汇和浓度
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RGPIN-2021-02937 - 财政年份:2021
- 资助金额:
$ 2.48万 - 项目类别:
Discovery Grants Program - Individual
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