Processes Affecting the Speciation of Iodine in the Oceans

碘以碘酸盐、碘化物和有机碘的形式存在于海水中。 虽然碘是最丰富的亲生物微量元素 其无机形态的分布是已知的， 关于可能控制其 物种形成在很大程度上是不完整的。 溶解的吸收 碘物质和伴随的碘酸盐还原， 海洋生物体内的碘化物可能与 与氮的吸收，这是一个主要 海洋初级生产力的控制因素。 碘是 表层海水中含量最丰富的无机还原剂。 碘化物和氧化性痕量物种之间的反应可以 对海洋以及地球化学具有重要影响 全球对流层化学 这个项目的总体目标是 项目是了解和量化生物和 生物过程，控制碘的形态， 海水以及碘系统与其他 地球化学重要物种 调查将（1） 通过以下方法定量溶解碘物质的摄取： 浮游植物，测试碘和 氮系统的过程中，并评估的可能性， 使用碘酸盐作为研究硝酸盐的方便类似物 摄取;和（2）量化碘化物和 海水中的过氧化氢， 这些反应对碘的海洋地球化学 系统

Iodine occurs in seawater as iodate, iodide and organic iodine. Although iodine is the most abundant biophilic minor element and the distributions of its inorganic forms are known, direct evidence concerning the processes that may control its speciation is largely incomplete. The uptake of dissolved iodine species and the accompanying reduction of iodate to iodide by marine organisms may be similar to and/or intertwined with the uptake of nitrogen species which is a major controlling factor of marine primary production. Iodide is the most abundant inorganic reducing agent in surface seawater. The reactions between iodide and oxidizing trace species can have geochemically important implications on marine as well as global tropospheric chemistry. The overall goal of this project is to understand and quantify the biological and biological processes that control the speciation of iodine in seawater and the interactions of the iodine system with other geochemically important species. The investigation will (1) quantify the uptake of dissolved iodine species by phytoplankton, test the interactions between the iodine and nitrogen systems in the process and evaluate the possibility of using iodate as a convenient analog for studying nitrate uptake; and (2) quantify the reactions between iodide and hydrogen peroxide in seawater and estimate the importance of these reactions to the marine geochemistry of the iodine system.