SGER: Exploratory Research on the Stability and Reactivity of Higher Oxidation State Mn and Fe Complexes in Seawater

高分子聚合物的稳定性和反应活性的探索性研究 海水中氧化态锰、铁络合物 盐沼沉积物中黄铁矿氧化与硫化物氧化 在黑海和切萨皮克湾的沃茨， 厌氧过程这些过程在电子上是化学的 转移步骤，但可以通过生物过程介导。 在溶解铁浓度达到mM的盐沼中， 水平，黄铁矿氧化可以介导的Fe（III）有机 络合物，因为溶解的Fe的快速循环。 主要 铁循环的反应是（1）Fe（III）的增溶， 有机配体，（2）通过还原可溶性Fe（III）为Fe（II）， 这些配体，可溶性还原硫或黄铁矿，（3）氧化 通过Fe（III）将所得Fe（II）（与有机螯合物络合） 矿物释放更多的溶解Fe（III），和（4）形成 当溶解的硫化物过量时，铁硫化物矿物。这 铁溶解的循环将继续，只要细菌 和/或植物产生有机配体。 本研究将调查 硫化物与可溶性Fe（III）和Mn（III）络合物反应 并建立了测定水中溶解锰的方法 缺氧沃茨。 这些络合物甚至应该作为催化剂存在 富含有机物的缺氧沃茨水中的中间体。他们很容易 根据化学文献中的方法制备。//

Exploratory Research On The Stability And Reactivity Of Higher Oxidation State Mn and Fe Complexes In Seawater Pyrite oxidation in salt marsh sediments and sulfide oxidation in the waters of the Black Sea and the Chesapeake Bay can occur by anaerobic processes. These processes are chemical at the electron transfer step, but can be mediated by biological processes. In salt marshes where dissolved Fe concentrations reach mM levels, pyrite oxidation can be mediated by Fe (III) organic complexes because of the rapid cycling of dissolved Fe. The main reactions of the iron cycle are (1) solubilization of Fe(III) by organic ligands, (2) reduction of soluble Fe(III) to Fe(II) by these ligands, soluble reduced sulfur or pyrite, (3) the oxidation of the resulting Fe(II) (complexed to organic chelates) by Fe(III) minerals releasing more dissolved Fe(III), and (4) the formation of iron sulfide minerals when dissolved sulfide is in excess. This cycle of iron solubilization will continue as long as bacteria and/or plants produce organic ligands. This study will investigate the reaction of sulfide with soluble Fe(III) and Mn(III) complexes and develop a method for the determination of dissolved Mn(III) in anoxic waters. These complexes should exist even as catalytic intermediates in organic rich anoxic waters. They are easily prepared based on methods in the chemical literature. //