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

由特拉华大学海洋科学与政策学院和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研究可溶性锰（III）在锰的生物地球化学循环中的重要性。迄今为止，大多数关于海洋环境中Mn的研究都没有考虑Mn(III), Mn（III）是介于可溶性还原态（Mn(II)）和不溶性氧化态（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，特别是在氧水平降低的海洋系统中，改变了Mn在这些位置以及在氧和低氧环境之间的界面上的动力学和稳定性、溶解度、命运和运输。目前尚不清楚这一点，拟议的研究准备提供有关锰循环的新信息，并可能是变革性的研究。项目负责人已经开发了新的方法来检查环境中的锰（III）水平，这种能力将促进项目的成功完成。年代的目标。这些研究不仅将集中于了解锰在不同氧化态之间的循环，而且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。该研究还将研究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，Fe和S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，不仅会给那些对海洋金属循环感兴趣的科学家提供信息，也会给那些专注于氧化还原过渡带研究的科学家提供信息。拟议的研究具有国际组成部分，研究人员已制定计划，向各级学生和社区广泛传播其结果。首席研究员在教育、研究生和博士后支持和指导方面有着悠久的历史，这将在当前的资助下继续下去。

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.