Funded by the European Union – NextGenerationEU.

With an aim to gain experience and achieve reliable results in metal nanoparticle determination in natural waters, as well as increase of recognizability of the research group in that research area, we have planned a project for comparative measurement of dissolved and nanoparticulate metals in selected Zagreb streams and in the Mura River. Since several metala are used for medicinal purposes in the form of nanoparticles (e.g., Ag, Ce, Cu, Fe), we will select six streams that flow nearby hospitals in Zagreb, four streams in the vicinity of which there is no medicinal objects, and two reference streams on east and west slopes of the Medvednica mountain. The study will be carried out during low water-level (prolonged dry period) and during increased water-level (rainy period) to establish the influence of dilution and/or potential additional input through soil washout on dissolved metal concentrations and the content of selected metal nanoparticles in the water of the Zagreb streams. Moreover, we will conduct single study on five locations on the Mura River, to gather preliminary data and recognize nanoparticles which are relevant in the area influenced by agriculture, coal mining and pharmaceutical industry.