The Biogeochemical Dynamics Program is an interdisciplinary research-oriented, graduate-only program within the College of Arts and Sciences. We are investigating important areas in environmental biogeochemistry. For example, the chemical structure of organic nitrogen and phosphorus compounds, and of the organic ligands that react with trace metals and metalloids, controls the environmental reactivity, microbial bioavailability, transport, and fate of these critical elements in aquatic systems. Recent advances in analytical geochemistry at FSU and the National High Magnetic Field Laboratory (NHMFL) offer unique capabilities to probe the organic components in aquatic systems with unprecedented detail. The recent development of multi-collector inductively-coupled plasma mass spectrometers (MC-ICP-MS) allows the use of trace element isotope variations as natural biogeochemical tracers. Combining these capabilities will allow us, for the first time, to obtain a truly molecular-level understanding of trace element complexation and organo-nutrient speciation and cycling in the environment.