Nanoparticle inventory in a sediment core from the Iron Gate I reservoir

River sediments are a sink for natural and anthropogenic nanoparticles. Given their risk to harm ecosystems and humans the latter are among contaminants of emerging concern. Here we present multi-element single-particle data of a Danube sediment core, aiming to identify anthropogenic nanoparticles and elucidate their occurrence at different sediment depths. A fly ash dump near Kostolac, Serbia, on the right bank of the Danube River is a likely point source of anthropogenic fly ash particles. Kostolac fly ash particles are enriched in elements such as Cu, Ni, and V. The signatures of these elements within nanoparticles of the sediment core reveal four potential events of fly ash release into the Danube.