Collaborative Research: Investigations into the Temporal & Source-Dependent Chemical Compositions & Reactivity of Natural Dissolved Organic Matter

在该项目中，Old自治领大学和俄亥俄州州立大学的研究人员将把天然溶解有机物（DOM）分子水平化学特征的测定与定量探索DOM与模型化合物反应性的研究结合起来。 他们的初步工作表明，由于季节和来源造成的DOM成分差异会影响天然沃茨的整体化学性质，从而引起特定化合物溶解度等方面的变化。 该团队将调查DOM的组成和反应性随季节（超过2.3年）、有机物来源（从上游黑水河到沿海海洋的6个地点）和水化学（pH值、盐度等）的变化。 一个严格的采样制度，结合实验室工作，旨在详细的散装化学成分和反应的DOM将允许更全面的定量模型DOM化学和人为化合物的相互作用。 作为这项工作的一部分，研究人员计划使用NMR，IR，HLPC和几种质谱方法来全面表征DOM，并使用NMR和IRMS定量跟踪其与同位素标记的模型化合物的化学相互作用。这项研究将在水生/海洋和分析化学领域取得重大进展，污染物迁移和人为化合物对水系的影响以及有机物的固存和保护。 老自治领大学和俄亥俄州州立大学都致力于培养研究生、本科生和K-12学生。 这项工作将提供直接支持，三个研究生的论文主题将集中在DOM表征，变异性和分子相互作用。 本科生将接受高级分析和仪器技术以及结果解释方面的培训。 该项目还将通过与NSF赞助的REU-MUST项目在ODU的海洋科学和OSU的环境分子科学方面的合作得到加强。

ABSTRACTOCE-0453777 / OCE-0453743In this project, investigators at the Old Dominion University and the Ohio State University will integrate the determination of molecular-level chemical characteristics of natural dissolved organic matter (DOM) with investigations that quantitatively explore the reactivity of DOM with model compounds. Their preliminary work shows that compositional differences in DOM attributed to both season and source can influence the bulk chemical properties of natural waters so as to induce changes in, for example, the solubility of specific compounds. The team will investigate changes in composition and reactivity of DOM as a function of season (over 2.3 years), organic matter source (6 sites from upstream blackwater rivers to the coastal ocean) and water chemistry (pH, salinity, etc.). A rigorous sampling regime, combined with laboratory work designed to detail both the bulk chemical composition and reactivity of the DOM will allow for more comprehensive quantitative models of DOM chemistry and interactions with anthropogenic compounds. As part of this work, the researchers plan to use NMR, IR, HLPC and several mass spectral approaches to fully characterize the DOM and use NMR and IRMS to quantitatively follow its chemical interactions with isotopically labeled model compounds.Broader Impacts: This study will provide significant advancements in the areas of aquatic/marine and analytical chemistry, contaminant transport and the impact of anthropogenic compounds in aqueous systems and organic matter sequestration and preservation. Both Old Dominion University and Ohio State University are strongly committed to the training of graduates, undergraduates and K-12 students. This work will provide direct support for three graduate students whose dissertation topics will be centered in DOM characterization, variability and molecular interactions. Undergraduate students will be trained in advanced analytical and instrumental techniques as well as in the interpretation of their results. The project will also be augmented through association with the NSF-sponsored REU-MUST program in ocean science at ODU and environmental molecular science at OSU.