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

钍（Th）的各种自然产生的放射性同位素在化学海洋学中已经变得突出，因为它们在确定大颗粒和胶体亚颗粒的通量率方面很有用。对粒子动力学（产生、破坏、下沉、混合）来说，Th倾向于优选出好的示踪剂。然而，所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a&m大学的同事将进行实验室实验，以确定海水中粒子、有机分子和胶体聚集成越来越大的聚集体的吸附-描述动力学特性，这一过程负责海洋和其他自然水域中新粒子的形成。这些结果最终将被折叠成一个更现实的Th行为模型，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.