Relationship of Th(IV) Speciation to Scavenging in Marine Environments

9633125 Santschi是钍(Th)的各种自然存在的放射性同位素，由于它们在测定大颗粒和胶体亚粒子的通量速率方面的应用，在化学海洋学中已变得重要起来。Th优先从良好的粒子动力学示踪剂(生产、破坏、下沉、混合)中出来的趋势。然而，涉及的计算是基于模型的，目前使用的模型相当简单。在这项研究中，PI和他在德克萨斯农工大学的同事们将进行实验室实验，以确定海水中Th的吸附-描述动力学特性，这些颗粒、有机分子和胶体聚集成越来越大的聚集体，这一过程负责在海洋和其他自然水域中形成新的颗粒。这些结果最终将被合并到一个更现实的Th行为模型中，这将有助于海洋化学家和地球化学家更自信地使用Th示踪剂，并更好地了解其局限性和实用性。

9633125 SANTSCHI The various naturally-occurring radioactive isotopes of thorium (Th) have come to prominence in chemical oceanography because of their utility in determining the rates of flux of large particulate and colloidal subparticles. The tendency of Th to preferentially come out of good tracer for particle dynamics (production, destruction, sinking, mixing). However, the computations involved are model-based, and the models currently used are rather simplistic. In this research, the PI and his coworkers at Texas A&M University will conduct laboratory experiments to determine the sorption-description kinetic properties of Th in seawater with particles, organic molecules, and colloids aggregate into larger and larger aggregates, a process responsible for the formation of new particles in marine and other natural waters. The results will finally be folded into a more realistic model of Th behavior that should help marine chemists and geochemists use the Th tracer more confidently and with a better understanding of its limitations as well as its utility.