US-France Cooperative Research: Particle Dynamics and Biogeochemistry of Trace Elements in Natural Waters

该奖项将支持麻省理工学院的Francois Morel博士和法国巴黎高等高等学院的Jean-Marie Martin博士在生物海洋学方面的合作研究。该项目的目的是研究天然水中胶体和微粒的性质、动力学、金属结合和地球化学作用。美国和法国的研究小组有几个共同的长期研究目标：1)表征水生颗粒(包括胶体)及其动力学；2)表征和模拟金属与颗粒和胶体的结合；3)量化；以及模拟溶液/颗粒交换在天然水域中痕量元素的地球化学和地球生物学中的作用。在这个项目中，合作者将专注于1)用于表征水生颗粒和胶体的荧光光谱技术的开发，以及2)金属结合热力学模型的开发，并与新的比量热、动力学和光谱数据进行验证和关联。该项目将受益于美国研究人员在大颗粒和地球化学方面的互补专业知识，以及法国在胶体和物理化学机制方面的经验。由于微粒和胶体是天然水体中痕量元素的主要载体，阐明它们的动力学对于理解微量元素的生物地球化学是至关重要的，无论是天然的还是人为的。

This award will support collaborative research in biological oceanography between Dr. Francois Morel, Massachusetts Institute of Technology and Dr. Jean-Marie Martin, Ecole Normale Superieure, Paris, France. The objective of this project is to study the nature, dynamics, metal binding and geochemical role of colloids and microparticles in natural waters. The US and French groups have several common long term research aims: 1) to characterize aquatic particles (including colloids) and their dynamics 2) to characterize and model the binding of metals to particles and colloids and 3) to quantify; and model the role of solution/particle exchanges in the geochemistry and geobiology of trace elements in natural waters. In this project the collaborators will focus on 1) the development of fluorescence spectroscopy techniques for the characterization of aquatic particles and colloids and 2) the development of thermodynamic models of metal binding, validated and contrained with new specific calorimetric, kinetic and spectroscopic data. The project will benefit from the complementary expertise of the US investigator in large particles and geochemistry and the experience of the French in colloids and physicochemical mechanisms. Because microparticles and colloids have major carriers of trace elements in natural waters, an elucidation of their dynamics is essential to an understanding of the biogeochemistry of trace elements, both natural and anthropogenic.