Collaborative Research: The role of soluble Mn(III) in the biogeochemical coupling of the Mn, Fe and sulfur cycles

合作研究：可溶性 Mn(III) 在 Mn、Fe 和硫循环的生物地球化学耦合中的作用

• 批准号: 1154307
• 负责人: Bradley Tebo
• 金额: $ 42.97万
• 依托单位: Oregon Health & Science University
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 2012
• 资助国家: 美国
• 起止时间: 2012-02-01 至 2016-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=1154307&HistoricalAwards=false
• 关键词: Collaborative; Research; role; soluble; Mn

The research conducted by investigators in the School of Marine Science and Policy at the University of Delaware and within the Department of Environmental and Biomolecular Systems of Oregon Health and Science University will examine the importance of soluble Mn(III) in the biogeochemical cycling of Mn. To date, most studies of Mn in marine environments have not considered Mn(III), the intermediate oxidation state between the soluble reduced state (Mn(II)) and the more insoluble oxidized state (Mn(IV)). The presence and stability of Mn(III) in marine systems, especially those where oxygen levels are reduced, changes the dynamics and stability, solubility and fate and transport of Mn in these locations, and at interfaces between oxic and low oxygen environments. This is not understood at present and the proposed research is poised to provide new information concerning the Mn cycle and is potentially transformative research. The PIs have developed new methods to examine Mn(III) levels in the environment and this capability will bolster the successful accomplishment of the project?s goals. The studies will not only focus on understanding the cycling of Mn between its various oxidation states but will determine the concentration and distribution of Mn(II) in stratified coastal ocean waters and in sediment porewaters. The study will also examine the potentially important role of Mn(III) in mediating and influencing the biogeochemical cycling of Mn with that of Fe and S, which are both important components of the major ocean chemical cycles. A better understanding of the biogeochemistry of Mn will inform not only scientists interested in metal cycling in the ocean but also those focused on studies across redox transition zones. The proposed research has an international component and the investigators have developed plans to broadly disseminate their results to students at all levels and to the community. The Principal Investigators have a strong history in education and graduate student and post-doctoral support and mentoring and this will continue under the current grant.

特拉华大学海洋科学与政策学院的研究人员在俄勒冈州健康与科学大学的环境与生物分子系统内进行的研究将研究MN生物地球化学循环中可溶性MN（III）的重要性。迄今为止，大多数在海洋环境中的MN研究尚未考虑MN（III），即可溶性还原状态（MN（II））与更不溶性氧化状态（MN（MN（IV））之间的中间氧化态。 MN（III）在海洋系统中的存在和稳定性，尤其是那些氧气水平降低的人，改变了这些位置中MN的动力学和稳定性，溶解度以及命运以及在氧气和低氧环境之间的接口。目前尚不清楚这一点，拟议的研究有望提供有关MN周期的新信息，并且是潜在的变革性研究。 PI开发了研究环境中MN（III）级别的新方法，这种能力将加强项目目标的成功实现。这些研究不仅将着重于了解MN在其各种氧化态之间的循环，而且还将确定分层沿海海水和沉积物孔隙水中Mn（II）的浓度和分布。该研究还将研究Mn（III）在介导和影响MN的生物地球化学循环中的潜在重要作用，而Mn则是FE和S的生物地球化学循环，这都是主要海洋化学循环的重要组成部分。对MN的生物地球化学的更好理解不仅会告知对海洋中金属循环感兴趣的科学家，而且还将为跨氧化还原过渡区研究的研究提供信息。拟议的研究具有国际成分，研究人员制定了计划，将其成果广泛传播给各个层次和社区的学生。首席调查人员在教育和研究生和博士后支持和指导方面拥有悠久的历史，这将继续根据目前的赠款。