Welcome to the Chappaz research group website! Our main investigation topic is the biogeochemistry of trace elements in the environment. More specifically, we explore the trace metal and metalloid behaviors in lakes and oceans through experimental approach, analysis of diverse natural materials, and transport-reaction modeling. Our aims are to identify the reactions involving trace elements and to determine their speciation in modern and ancient aquatic systems. The implications of our research are extensive and contribute, for example, to a better understanding of how the chemistry of Earth’s oceans has changed through geologic time (paleo-environmental implications), and of how the human activities have drastically impacted the biogeochemical cycling of trace elements in the Great Lakes (modern-environmental implications). We are lucky to work in new research facilities (GEM lab: Geochemistry – Environment – Metal) that were entirely remodeled in 2013 to incorporate a trace metal clean room (ISO 6) allowing us to measure extremely low metal concentrations.
Dr. Anthony Chappaz recently published an article in the prestigious journal Geochimica et Cosmochimica Acta demonstrating for the first time that molybdenum (Mo) is not predominantly bound to pyrite in modern and ancient euxinic settings, as previously thought. These new results reinforce a possible role played by the organic matter to explain Mo burial in euxinic sediments.