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, This manuscript reports the temporal evolution of silver (Ag) and thallium (Tl) concentrations 616 in sediment cores. These cores, issued from downstream Seine River flood plains, represent 617 extraordinary archives of the sediments flowing across Paris conurbation. Ag and Tl are two 618 toxic metals, released to the environment by human activities and scarcely documented in 619 river sediment. The present work shows a huge Ag sediment contamination around 1960

, In addition, the Ag and Tl 622 geochemical background concentrations in the Seine River were documented