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.

在化学部环境化学科学计划的支持下，得克萨斯州A＆M大学的Garrett McKay教授将研究溶解有机物中吸收光吸收化合物的化学结构。溶解的有机物是地球上最丰富的碳源之一，与阳光相互作用在环境中循环该碳中起着重要作用。使用先进的分析工具和光谱法，该项目将确定溶解有机物中吸光基团的结构成分以及这些组相互作用的程度。了解这些吸光群体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。除了培训本科和研究生的培训外，还涉及卢夫金高中（卢夫金高中，德克萨斯州卢夫金）的水生科学课程，还将为那些人数不足的学生提供一个机会，可以在当地水域中研究溶解的有机物成色量的机会。元素周期，污染物的衰减以及地球海洋的生产力。但是，了解塑造DOM光学和光化学特性的过程的知识仍然是弹性的。这项研究将将质谱，电化学和分离技术与多个光谱镜结合在一起，以揭示溶解有机物发色团之间供体 - 受体相互作用的患病率和组成。用精心选择的模型化合物进行的研究也将用于评估这些相互作用的结构驱动因素。该奖项反映了NSF的法定任务，并使用基金会的知识分子优点和更广泛的影响审查标准，被认为值得通过评估。