Collaboration with Nanoscale Investigations of Marine Organic Matter Diagenesis

与海洋有机质成岩作用的纳米级研究合作

• 批准号: 0221336
• 负责人: George Cody
• 金额: $ 7.75万
• 依托单位: Carnegie Institution of Washington
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2002
• 资助国家: 美国
• 起止时间: 2002-09-01 至 2005-08-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0221336&HistoricalAwards=false
• 关键词: Collaboration; Nanoscale; Investigations; Marine; Organic

ABSTRACTOCE-0221295OCE-0221029OCE-0221336Investigation of the chemical structures of the uncharacterized fraction of marine dissolved organic matter remains an elusive goal for marine organic chemists. An approach to be used in this work is to directly address supramolecular size scales of marine organic matter structures by assessing their microheterogeneity on micro to nanoscales. Using Scanning Transmission X-ray Microscopy (STXM), a technique that allows the registration of Near Edge X-ray Absorption Fine Structure (NEXAFS) spectra, will allow the quantification of the relative abundance of different functional groups and element bonding types. This spatial mapping of the chemistry of macromolecular assemblages at scales intermediate between bulk chemical analysis and analysis individual molecules or molecular classes offers the capabilities of a important new analytical tool to marine chemistry. In a survey mode, a range of organic materials collected and contributed by several researchers from different parts of the world's oceans will be examined using these techniques. This approach will be extended with additional samples of collected sediment and suspended (trapped) particulates. Laboratory experiments using whole phytoplankton and bacterial cultures will be used to provide materials appropriate to the earlier stages of organic matter diagenesis.

摘要：海洋溶解有机物中未表征组分的化学结构研究一直是海洋有机化学家们难以实现的目标。在这项工作中使用的一种方法是通过在微观到纳米尺度上评估海洋有机物结构的微观非均质性来直接解决超分子尺度的问题。使用扫描透射x射线显微镜（STXM），一种允许近边缘x射线吸收精细结构（NEXAFS）光谱注册的技术，将允许量化不同官能团和元素键合类型的相对丰度。这种在整体化学分析和分析单个分子或分子类别之间的尺度上的大分子组合化学的空间映射为海洋化学提供了一种重要的新分析工具。在调查模式下，将使用这些技术检查由世界海洋不同地区的几位研究人员收集和贡献的一系列有机材料。这种方法将扩展到收集的沉积物和悬浮（捕获）颗粒的额外样本。使用整个浮游植物和细菌培养物的实验室实验将用于提供适合有机质成岩作用早期阶段的材料。