My research activities focus on complementary issues related to metallic trace elements, their environmental fate, reactivity, speciation, source apportionment using stable isotopes, toxicity on aquatic organism and exposure to humans. I cover analytical developments in environmental (bio)geochemistry and application of geochemical tracers and metal stable isotopes to large scale (Gironde and Scheldt watersheds) and point source systems related to urban/domestic acticvities (wastewater treatment plants), metal processing plants and ore-forming environments. The purpose is to quantify mixing relationships, investigate transfer processes, speciation and reactivity for legacy (Pb, Cd, As, Cu, Zn,...)  and emerging (Ag, Pt) trace metals.