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Processes Affecting the Speciation of Iodine in the Oceans

影响海洋中碘形态的过程

基本信息

批准号：
8910956
负责人：
George Wong
金额：
$ 15.56万
依托单位：
Old Dominion University Research Foundation
依托单位国家：
美国
项目类别：
Continuing Grant
财政年份：
1989
资助国家：
美国
起止时间：
1989-10-15 至 1992-09-30
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=8910956&HistoricalAwards=false
关键词：
Processes Affecting Speciation Iodine Oceans

项目摘要

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.

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在地球化学上对海洋以及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