Key factors influencing metal concentrations in sediments along Western European Rivers: A long-term monitoring study (1945–2020)

A comprehensive analysis of over 12,000 sediment samples from seven major Western European rivers reveals significant spatio-temporal trends in metal contamination (Cd, Cr, Cu, Hg, Ni, Pb, Zn) between 1945 and 2020. Key findings include increased metal concentrations downstream of urban-industrial areas like Paris-Rouen on the Seine River and Bonn-Duisburg on the Rhine River, persistent contamination from former mining sites in crystalline zones (Upper Loire, Middle Meuse), and a general decline in metal levels since the 1970s—except for Cr and Ni. The study attributes these trends to effective environmental policies, improved wastewater treatment, and urban-industrial changes, highlighting the resilience of river systems when regulations are enforced.

Dendievel, A.-M., Grosbois, C., Ayrault, S., Evrard, O., Coynel, A., Debret, M., Gardes, T., Euzen, C., Schmitt, L., Chabaux, F., Winiarski, T., Van Der Perk, M., & Mourier, B. (2022). Key factors influencing metal concentrations in sediments along Western European Rivers: A long-term monitoring study (1945–2020). Science of the Total Environment, 805, 149778. https://doi.org/10.1016/j.scitotenv.2021.149778