RUI: Chemical Characterization and Reactivity of Chromophoric Dissolved Organic Matter (CDOM) in Rainwater

RUI：雨水中发色溶解有机物 (CDOM) 的化学表征和反应性

• 批准号: 0646153
• 负责人: Robert Kieber
• 金额: --
• 依托单位: University of North Carolina at Wilmington
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 2007
• 资助国家: 美国
• 起止时间: 2007-09-01 至 2011-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0646153&HistoricalAwards=false
• 关键词: RUI; Chemical; Characterization; Reactivity; Chromophoric

This project addresses the questions: (1) What are the origin and chemical characteristics of chromophoric dissolved organic matter (CDOM) in rainwater? (2) What is CDOM's role in photochemical transformations? (3) What is CDOM's involvement in metal speciation? These questions will be studied with a variety of tools including isotopic analysis, NMR, and controlled photolysis experiments. For the analyses, rainwater CDOM samples will be collected during different seasons, storm types, and locations. The rates and quantum yields for the formation of hydrogen peroxide and other small molecules will be determined with photolysis experiments. The contribution of CDOM nitrogen to dissolved organic nitrogen in rainwater will also be assessed. This research will provide new information on the chemical and physical factors influencing sources, fate, and atmospheric impacts of rainwater CDOM, which may be the predominant form of carbon in precipitation. CDOM photochemistry affects the spectral attenuation of solar radiation, tropospheric free radical chemistry, oxidizing capacity, acid generating capacity, and trace metal speciation in the atmosphere. Broader impacts also include education and training of a post-doctoral researcher, two master's level graduate students, two undergraduates and one high school student each year. In addition, a local high school science teacher will participate in this research for one month each year.

该项目解决了以下问题：（1）雨水中发色溶解有机物（CDOR）的起源和化学特征是什么？ （2）CDOR在光化学转换中的作用是什么？ （3）CDOR参与金属物种形成是什么？ 这些问题将使用各种工具进行研究，包括同位素分析，NMR和受控的光解实验。 对于分析，将在不同的季节，风暴类型和位置收集雨水CDOM样品。 通过光解实验确定过氧化氢和其他小分子的形成的速率和量子产率。 还将评估CDOM氮对雨水中溶解有机氮的贡献。 这项研究将提供有关影响雨水CDOR来源，命运和大气影响的化学和物理因素的新信息，这可能是降水中碳的主要形式。 CDOM光化学会影响太阳辐射，对流层自由基化学，氧化能力，产生酸产能和痕量金属物种物种的光谱衰减。 更广泛的影响还包括对博士后研究人员的教育和培训，两名硕士学位的研究生，两名本科生和一名高中生。 此外，当地的高中科学老师每年将参加这项研究一个月。