Cerium Redox Chemistry in Seawater: Evaluation as a Tracer of Oxide Mediated Scavenging Processes

铈是唯一表现出氧化还原反应的稀土元素 海洋水体中的化学物质 了解其 地球化学可以提供重要的见解的作用， 氧化还原过程中的微量元素运输。 初步 Ce氧化还原化学的研究表明， 动态氧化还原化学，氧化物表面上的Ce（III）氧化 表面沃茨中Ce（IV）的光还原可能是 在其优先去除的重要过程， 相对于三价稀土的再活化 不同条件 此外，Ce氧化还原化学显示出 与锰的相似性。 肖尔科维茨博士和莫菲特建议进行详细的 铈氧化还原化学的实验室和现场研究 在海水中，扩大我们对自然水的基本知识， 化学和识别过程中重要的运输。 这些数据将用于评价Ce异常的有用性 数据作为金属氧化物介导的运输的示踪剂， 锰的地球化学类似物。

Cerium is the only rare earth element which exhibits a redox chemistry in the marine water column. Understanding its geochemistry may provide important insights into the role of redox processes in minor element transport. A preliminary investigation of Ce redox chemistry indicates that it exhibits a dynamic redox chemistry, with Ce(III) oxidation on oxide surfaces and photoreduction of Ce(IV) in surface waters being potentially important processes in its preferential removal and remobilization relative to the trivalent rare earths under different conditions. Furthermore, Ce redox chemistry shows a close similarity to that of manganese. Dr.Sholkovitz and Moffett propose to carry out a detailed laboratory and field investigation of the redox chemistry of Ce in seawater, to expand our basic knowledge of its natural water chemistry and identify the processes important in its transport. The data will be used to evaluate the usefulness of Ce anomaly data as a tracer of metal oxide mediated transport and a geochemical analog of manganese.