Photo-Oxidation and Photobleaching of Chromophoric Dissolved Organic Matter in Coastal Waters

近年来，大量证据表明海洋沃茨中溶解有机物的地球化学转化在很大程度上是由光和痕量金属催化作用介导的。 在这个项目中，主要研究者将对发色团的光氧化动力学进行全面研究（即，有色）溶解有机物（CDOM）在沿海沃茨。 实验室研究将在存在和不存在各种自由基清除剂和氧气的情况下进行，并使用动力学模型进行解释。 为了研究氢氧化物自由基的参与，将在无光的情况下通过化学或放射性分解产生氢氧化物。 本论文的主要内容包括：（1）Fe在海水中CDOM光氧化、光漂白和产物形成中的重要作用;（2）Fe缺乏时CDOM光漂白的光机制;（3）Fe-CDOM相互作用的机理。

ABSTRACTOCE-9819089In recent years, significant evidence has accumulated suggesting that the geochemical transformations of dissolved organic matter in marine waters is mediated in large measure by light and trace metal catalysis. In this project the principal investigator will conduct a comprehensive study of the kinetics of photooxidation of chromophoric (i.e., colored) dissolved organic matter (CDOM) in coastal waters. Laboratory studies will be conducted in the presence and absence of various radical scavengers and oxygen and interpreted using kinetic modeling. To study the involvement of hydroxide radical, hydroxide would be generated chemically or radiolytically in the absence of light. The specific topics that will be addressed include: (1) the importance of Fe in CDOM photooxidation, photobleaching and product formation in seawater; (2) the photomechanism of CDOM bleaching in the absence of Fe; and (3) the mechanisms of Fe-CDOM interactions.