CAREER: Molecular-Level Behavior of Chromophores in Dissolved Organic Matter

职业：溶解有机物中发色团的分子水平行为

• 批准号: 2237194
• 负责人: Garrett McKay
• 金额: $ 58.41万
• 依托单位: Texas A&M Engineering Experiment Station
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2023
• 资助国家: 美国
• 起止时间: 2023-03-01 至 2028-02-29
• 项目状态: 未结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=2237194&HistoricalAwards=false
• 关键词: CAREER; Molecular; Level; Behavior; Chromophores

With support from the Environmental Chemical Sciences Program of the Chemistry Division, Professor Garrett McKay of Texas A&M University will study the chemical structure of light-absorbing compounds in dissolved organic matter. Dissolved organic matter is one of the most abundant carbon sources on earth, and interaction with sunlight plays an important role in cycling this carbon in the environment. Using advanced analytical tools and spectroscopy, the project will determine the structural components of light-absorbing groups in dissolved organic matter and the extent to which these groups interact with one another. Understanding how these light-absorbing groups interact will improve the ability to predict the fate and reactivity of dissolved organic matter in the environment. In addition to training of undergraduate and graduate students, an educational outreach program, involving Lufkin High School’s (Lufkin, TX) Aquatic Science course, will give students who are members of underrepresented groups an opportunity to study dissolved organic matter chromophores in a local water body using state-of-the art techniques.The structure of chromophores in dissolved organic matter governs the mechanisms and rates of key processes in aquatic systems, such as elemental cycles, attenuation of contaminants, and productivity of the Earth’s oceans. However, knowledge of the processes that shape DOM’s optical and photochemical properties remains elusive. This research will combine mass spectrometric, electrochemical, and separation techniques with multiple spectroscopies to unravel the prevalence and composition of donor-acceptor interactions between dissolved organic matter chromophores. Studies conducted with carefully chosen model compounds will also be used to evaluate the structural drivers of these interactions.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.

在化学系环境化学科学项目的支持下，德克萨斯农工大学的Garrett McKay教授将研究溶解有机物中吸光化合物的化学结构溶解有机物是地球上最丰富的碳源之一。与阳光的相互作用在环境中的碳循环中发挥着重要作用，该项目将利用先进的分析工具和光谱学来确定溶解有机物中光吸收基团的结构成分以及这些基团彼此相互作用的程度。理解这些吸光基团如何相互作用将提高预测环境中溶解有机物的命运和反应性的能力。除了对本科生和研究生的培训之外，还开展了一项教育计划外展，其中包括拉夫金高中（德克萨斯州拉夫金）的水上运动。科学课程将为代表性不足群体的学生提供使用最先进技术研究当地水体中溶解有机物发色团的机会。溶解有机物中发色团的结构控制其机制然而，关于形成 DOM 光学和光化学性质的过程的知识仍然难以捉摸。以及利用多种光谱的分离技术来揭示溶解的有机物质发色团之间供体-受体相互作用的普遍性和组成，也将使用精心选择的模型化合物进行的研究来评估。这些相互作用的结构性驱动因素。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。