Surface Chemistry and Reactivity of Metastable Iron Sulfides under Anoxic Marine Conditions

本项目是研究硫化铁矿物的化学组成，以及控制其在天然沉积物中分布和组成的因素。拟议研究的主要重点是过渡金属和“B”类金属与硫化铁矿物的相互作用，并建立在最新结果的基础上。将对Mackinawite反应动力学和非铁金属与该相的共沉淀进行实验研究，以提供与硫化环境中金属行为相关的信息。将研究几种重要的“痕量”金属在各种硫化物沉积物中的“活性”、“溶解”和“黄铁矿”相中的分布，以确定控制这些金属向黄铁矿转移的主要因素。这些研究将通过放射性示踪剂的“JAR”实验得到加强。

This project is a study of the chemistry of iron sulfide minerals, and the factors controlling their distributions and composition in natural sediments. The primary focus of the proposed research is on the interaction of transition and class "B" metals with iron sulfide minerals, and builds on recent results. Experimental research on mackinawite reaction kinetics, and the coprecipitation of non-Fe metals with this phase will be undertaken to provide information relevant to metal behavior in sulfidic environments. The distribution of several important "trace" metals in "reactive", dissolved and pyrite phases will be studied in a variety of sulfidic sediments to determine the primary factors controlling the transfer of these metals into pyrite. These studies will be augmented by "jar" experiments with radiotracers.