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: 1155385
• 负责人: George Luther
• 金额: $ 41.09万
• 依托单位: University of Delaware
• 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=1155385&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以及俄勒冈健康与科学大学环境与生物分子系统系的研究人员进行的这项研究将探讨可溶性 Mn(III) 在锰生物地球化学循环中的重要性。迄今为止，大多数海洋环境中锰的研究都没有考虑锰（III），即可溶性还原态（Mn（II））和更难溶的氧化态（Mn（IV））之间的中间氧化态。海洋系统中 Mn(III) 的存在和稳定性，特别是那些含氧量降低的系统，改变了这些位置以及含氧和低氧环境之间界面处 Mn 的动力学和稳定性、溶解度、归宿和传输。目前这一点尚不清楚，拟议的研究有望提供有关锰循环的新信息，并且是潜在的变革性研究。 PI 开发了新方法来检测环境中的 Mn(III) 水平，这种能力将有助于项目目标的成功实现。这些研究不仅侧重于了解锰在各种氧化态之间的循环，还将确定分层沿海海水和沉积物孔隙水中锰（II）的浓度和分布。该研究还将探讨 Mn(III) 在介导和影响 Mn 与 Fe 和 S 的生物地球化学循环中的潜在重要作用，这两者都是主要海洋化学循环的重要组成部分。更好地了解锰的生物地球化学不仅可以为对海洋金属循环感兴趣的科学家提供信息，也可以为那些专注于跨氧化还原过渡区研究的科学家提供信息。拟议的研究具有国际性，研究人员已制定计划向各级学生和社区广泛传播他们的研究结果。首席研究员在教育、研究生和博士后支持和指导方面拥有悠久的历史，这将在当前的资助下继续下去。