Isotope Biogeochemistry of Polycyclic Aromatic Hydrocarbons in Riverine Sediments (With Application to St. Lawrence and Hudson River)

河流沉积物中多环芳烃的同位素生物地球化学（应用于圣劳伦斯河和哈德逊河）

• 批准号: 0073912
• 负责人: Teofilo Abrajano
• 金额: $ 23.5万
• 依托单位: Rensselaer Polytechnic Institute
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2000
• 资助国家: 美国
• 起止时间: 2000-07-15 至 2004-12-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0073912&HistoricalAwards=false
• 关键词: Isotope; Biogeochemistry; Polycyclic; Aromatic; Hydrocarbons

0073912AbrajanoThe molecular and stable isotopic compositions (C and H) of polycyclic aromatic hydrocarbons (PAH) and other particle-associated organic contaminants in riverine sediments reflect the combined effects of the (1) nature of contaminant sources, (2) biotic and abiotic transformation during transport, (3) dynamics of particle association and source mixing, (4) depositional history and (5) post-depositional diagenetic reactions. This multiplicity of possible sources and processes affecting particle-associated organic contaminants in large river systems requires a complete understanding of specific processes or sources on the molecular and isotopic chemistry of the contaminant. This in turn requires the availability of multiple hydrogeochemical vectors that are able to uniquely identify or seriously constrain specific contaminant sources and/or pathways.Our primary goal is to enhance existing approaches to evaluating the sources and fate of particle-associated organic contaminants in surface water systems. We will focus on the development of compound-specific 13C/12C and molecular organic measurements. The proposed work will examine the source discrimination potential of D/H ratios as well as D/H-specific transformation reactions involving hydrocarbons.Specifically, the impact of volatilization, photodegradation, sorption, and biodegradation on the D/H ratios of individual PAH compounds will be examined under a range of expected near-surface conditions. The proposed research will also examine the utility of the D/H technique for elucidating the sources and fate of PAH in the sediments of the St. Lawrence River (SLR) and Hudson River (HR) basins. These systems exemplify the multiplicity of natural and anthropogenic hydrocarbon sources in this region and elsewhere, and the long history of human use of these two rivers offers some of the most extensive records of anthropogenic hydrocarbon deposition and storage in river sediments.

河流沉积物中多环芳烃（PAH）和其他颗粒相关有机污染物的分子和稳定同位素组成（C和H）反映了（1）污染源的性质，（2）运输过程中的生物和非生物转化，（3）颗粒缔合和源混合的动力学，（4）沉积历史;（5）沉积后成岩反应。 这种多样性的可能来源和过程影响颗粒相关的有机污染物在大型河流系统需要一个完整的理解特定的过程或来源的分子和同位素化学的污染物。 这反过来又需要多个水文地球化学载体，能够唯一地识别或严重限制特定的污染物源和/或pathways.我们的主要目标是加强现有的方法来评估地表水系统中的颗粒相关的有机污染物的来源和命运。 我们将专注于化合物特定的13 C/12 C和分子有机测量的发展。 拟议的工作将检查的D/H比以及D/H特定的转化反应涉及碳氢化合物的源歧视potential。具体而言，挥发，光降解，吸附和生物降解对个别PAH化合物的D/H比的影响将在一系列预期的近地表条件下进行检查。 拟议的研究还将检查的D/H技术的效用，阐明的来源和命运的多环芳烃的沉积物中的圣劳伦斯河（SLR）和哈德逊河（HR）流域。 这些系统在该地区和其他地方的天然和人为碳氢化合物来源的多样性，以及人类利用这两条河流的悠久历史提供了一些最广泛的人为碳氢化合物沉积和储存在河流沉积物中的记录。