Sulfur isotope study of sulfide oxidation products: Great Marsh of Delaware and Green Lake NY

硫化物氧化产物的硫同位素研究：特拉华州大沼泽和纽约州绿湖

• 批准号: 0843814
• 负责人: James Farquhar
• 金额: --
• 依托单位: University of Maryland, College Park
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2009
• 资助国家: 美国
• 起止时间: 2009-03-01 至 2011-02-28
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=0843814&HistoricalAwards=false
• 关键词: Sulfur; isotope; study; sulfide; oxidation

Research Goals: Research will focus on describing the expression of sulfur isotope effects of sulfide oxidation products (polysulfides, polythionates, thiosulfate, sulfite, and sulfate) in two aqueous system case studies where sulfide oxidation occurs. We will collect samples from the Delaware Great Marsh during March, June, and August of 2009 and from Green Lake (a meromictic lake) during summer 2009. The aim of the study will be the isolation and isotopic characterization of the products of sulfide oxidation. The research will involve the adaptation of techniques for collection of these compounds so that measurements of the four sulfur isotopes can be made and with the purpose of characterizing and exploring the connections between the isotopic composition of the intermediates, pH, and biological activity. The overarching goal of this research effort is to develop a protocol based on four sulfur isotopes to place quantitative constraints on biological and abiotic pathways for sulfide oxidation in natural aquatic systems and in sediments. The work is rooted in the underlying premise that small isotope effects between products and reactants as well as between the variety of oxidation products will be expressed in different ways depending on the speciation of sulfur and the reaction pathways. This research is part of a larger effort underway by our group and others and extends our recent laboratory culture work with sulfate reducers, sulfur intermediate compound disproportionators, and biological sulfide oxidation.Broader Impacts of Proposed Activity: The results of this research will be prepared for publication in peer-reviewed journals. We anticipate that the outcomes of this research will carry implications for other studies of cycling of sulfur in geochemical systems and provide a context that can be used to inform our understanding of the significance of isotopic effects associated with sulfide oxidation in the sulfur cycle (present and past). The proposed activity will include involvement of undergraduates and will be incorporated into the broader activities of the PI.

研究目标：研究重点是描述硫化物氧化产物（多硫化物、连多硫酸盐、硫代硫酸盐、亚硫酸盐和硫酸盐）在发生硫化物氧化的两个水系统案例研究中硫同位素效应的表达。我们将在 2009 年 3 月、6 月和 8 月期间从特拉华州大沼泽采集样本，并在 2009 年夏季从 Green Lake（分聚湖）采集样本。研究的目的是硫化物氧化产物的分离和同位素表征。该研究将涉及改进收集这些化合物的技术，以便对四种硫同位素进行测量，目的是表征和探索中间体的同位素组成、pH 和生物活性之间的联系。这项研究工作的总体目标是开发一种基于四种硫同位素的协议，对天然水生系统和沉积物中硫化物氧化的生物和非生物途径进行定量限制。这项工作植根于一个基本前提，即产物和反应物之间以及各种氧​​化产物之间的小同位素效应将根据硫的形态和反应途径以不同的方式表达。这项研究是我们小组和其他人正在进行的更大努力的一部分，并扩展了我们最近在硫酸盐还原剂、硫中间化合物歧化剂和生物硫化物氧化方面的实验室培养工作。拟议活动的更广泛影响：这项研究的结果将为在同行评审期刊上发表。我们预计这项研究的结果将对地球化学系统中硫循环的其他研究产生影响，并提供一个背景，可用于帮助我们理解与硫循环中硫化物氧化相关的同位素效应的重要性（目前和过去的）。拟议的活动将包括本科生的参与，并将纳入 PI 更广泛的活动中。