Stable Carbon and Nitrogen Isotopic Compositions of SelectedOrganic Compounds

选定有机化合物的稳定碳和氮同位素组成

• 批准号: 9103654
• 负责人: Mahlon Kennicutt
• 金额: $ 34.05万
• 依托单位: Texas A&M Research Foundation
• 依托单位国家: 美国
• 项目类别: Continuing Grant
• 财政年份: 1991
• 资助国家: 美国
• 起止时间: 1991-10-15 至 1995-09-30
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9103654&HistoricalAwards=false
• 关键词: Stable; Carbon; Nitrogen; Isotopic; Compositions

Stable carbon and nitrogen isotope compositions of bulk organic matter, lipids and selected pigments (chlorophylls a, b and c; B-cartene; and phaeopigments) will be measured to investigate the sources and cycling of organic matter in slected marine environments. Preparative-scale high-performance liquid chromatographic methods will be used to isolate sufficient quantities of pure parent pigments for precise and accurate stable isotope analysis. Carbon and nitrogen uptake and biosynthetic utilization cause characteristic kinetic fractionations that can be used to define the "life histories" of of specific organic pools. While determinations of bulk organic matter properties are useful, the stable isotopic analysis of specific marker compounds holds great promise for deconvoluting organic matrices produced by multiple sources and complex processes. Field studies will include the characterization of three well- defined oceanographic settings to evaluate the variability, utility and limitations of pigment-specific stable isotope distributions for (1) resolving terrestrial and marine biomass; (2) differentiating organic matter sources in sediments; and (3) determining the relative importance of "new" vs. "recycled" production in the upper water column. //

有机质稳定碳、氮同位素组成 物质、脂质和选定的色素（叶绿素a、B和c; B-胡萝卜素;和phaeopigments）将被测量，以调查 海洋有机质的来源与循环 环境. 大规模高性能液体 将使用色谱方法分离足够的 大量的纯母颜料， 稳定同位素分析 碳和氮的吸收， 生物合成利用特征动力学 可以用来定义“生活史”的分数 特定的有机池。 当大量有机物的测定 物质的性质是有用的，稳定同位素分析， 特定的标记化合物对于去卷积具有很大的希望 有机基质由多种来源和复杂的 流程. 现场研究将包括三口井的特征- 定义海洋学设置来评估变化， 色素特异性稳定同位素的应用和局限性 （1）分辨陆地和海洋生物量的分布; (2)区分沉积物中有机质的来源;（3） 确定“新”与“回收”的相对重要性 在上层水柱中生产。//