RUI: Where does all the molybdenum go? Evaluating the role of iron sulfides in molybdenum accumulation in marine sediments

RUI:所有的钼都去了哪里?

基本信息

  • 批准号:
    2141721
  • 负责人:
  • 金额:
    $ 31.87万
  • 依托单位:
  • 依托单位国家:
    美国
  • 项目类别:
    Standard Grant
  • 财政年份:
    2022
  • 资助国家:
    美国
  • 起止时间:
    2022-05-01 至 2025-04-30
  • 项目状态:
    未结题

项目摘要

The project will study the role of sediment iron sulfides in removing dissolved molybdenum from the ocean. Molybdenum (Mo) is a trace metal found in ocean sediments. It is used as an indicator of low-oxygen and high-sulfide conditions in the past. Understanding the history of ocean oxygenation is important for monitoring low-oxygen “dead zones” in modern coastal waters and predicting the impact of climate change on the oceans. However, the processes by which Mo accumulates in sediments are not well understood. This project will use laboratory experiments to study the interactions between solution Mo and solid iron sulfides. The research will be carried out at an undergraduate institution. The study will provide a structured progression of experiences for students from historically underrepresented groups in STEM. It will include a cohort-mentor approach to support students before they arrive on campus and throughout their introductory science courses. Summer Research Students (rising juniors and seniors) will be engaged in every aspect of this project. These juniors and seniors will also serve as peer mentors for Research Cohort students (rising sophomores), forming an effective research team. Student exposure to graduate school opportunities will occur through meetings with research groups at the Pennsylvania State University. Finally, interest in geochemistry will be fostered by developing an environmentally-themed laboratory module within an introductory General Chemistry course. The goal of this work is to clarify the relative importance in marine sediments of: (1) sorption of Mo to iron sulfides, (2) retention of Mo during the formation of pyrite and/or exclusion of Mo upon growth of crystalline pyrite domains, and (3) possible formation of a distinct FeMoS product. Recent work established that Mo removal from sulfidic waters occurs with the initial formation of metastable iron sulfides and Mo is retained during the transformation of these precursor phases to the thermodynamically stable form of pyrite. With this groundwork, it should be possible to conclusively determine the role that iron sulfides play in the accumulation of Mo in marine sediments by: 1) synthesizing metastable iron sulfides and evaluating Mo adsorption to these species under various conditions to determine the impact of Mo thiolation, iron sulfide surface chemistry, and redox behavior; 2) monitoring the transformation of these materials to pyrite to determine how various initial conditions alter the retention or incorporation of Mo; and 3) developing a model that traces the fate of Mo through these processes and reconciles the disparate literature evidence. Understanding the role that iron sulfides and their phase transformations play in Mo accumulation will provide a strong foundation for work that employs Mo as a paleotracer.This award reflects NSF's statutory mission and has been deemed worthy of support through evaluation using the Foundation's intellectual merit and broader impacts review criteria.
该项目将研究沉积物铁硫化物在从海洋中去除溶解的钼方面的作用。钼(Mo)是一种在海洋沉积物中发现的微量金属。它在过去被用作低氧和高硫化物条件的指示剂。了解海洋氧化的历史对于监测现代沿海沃茨的低氧“死区”和预测气候变化对海洋的影响非常重要。然而,Mo在沉积物中积累的过程还不清楚。本计画将利用实验室实验来研究液态钼与固态铁硫化物之间的相互作用。这项研究将在一所本科院校进行。该研究将为来自STEM历史上代表性不足的群体的学生提供结构化的经验进展。它将包括一个队列导师的方法,以支持学生在他们到达校园之前,并在他们的入门科学课程。暑期研究生(即将入学的大三学生和大四学生)将参与该项目的各个方面。这些大三和大四学生也将作为研究队列学生(上升的学生)的同伴导师,形成一个有效的研究团队。学生接触研究生院的机会将通过与宾夕法尼亚州立大学的研究小组会议发生。最后,在地球化学的兴趣将通过开发一个环境为主题的实验室模块在介绍一般化学课程培养。本工作的目的是澄清在海洋沉积物中的相对重要性:(1)吸附钼的铁硫化物,(2)保留钼在形成黄铁矿和/或排除钼的结晶黄铁矿域的增长,和(3)可能形成一个独特的FeMoS产品。最近的工作建立了从硫化物沃茨中去除钼发生在亚稳铁硫化物的初始形成过程中,并且钼在这些前体相转化为热稳定形式的黄铁矿的过程中被保留。在此基础上,我们可以通过以下方法最终确定铁硫化物在海洋沉积物中钼积累中的作用:1)合成亚稳铁硫化物,并评估在不同条件下钼对这些物种的吸附,以确定钼硫醇化、铁硫化物表面化学和氧化还原行为的影响; 2)监测这些材料向黄铁矿的转化,以确定各种初始条件如何改变Mo的保留或掺入; 3)发展一个模型,通过这些过程追溯莫言的命运,并调和不同的文献证据。了解铁硫化物及其相变在钼积累中的作用将为利用钼作为古示踪剂的工作提供坚实的基础。该奖项反映了NSF的法定使命,并通过使用基金会的知识价值和更广泛的影响审查标准进行评估,被认为值得支持。

项目成果

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Jennifer Morford其他文献

Jennifer Morford的其他文献

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{{ truncateString('Jennifer Morford', 18)}}的其他基金

Collaborative Research: Tracking Middle-late Paleozoic Global-ocean Redox Conditions Using U Isotopes in Marine Carbonates
合作研究:利用海洋碳酸盐中的U同位素追踪中晚古生代全球海洋氧化还原条件
  • 批准号:
    1733641
  • 财政年份:
    2017
  • 资助金额:
    $ 31.87万
  • 项目类别:
    Standard Grant
The Geochemistry of U, Re, Mo in Margin and Coastal Sediments
边缘和沿海沉积物中 U、Re、Mo 的地球化学
  • 批准号:
    0220892
  • 财政年份:
    2002
  • 资助金额:
    $ 31.87万
  • 项目类别:
    Standard Grant

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