Microplastics are contaminants found in aquatic environments, caused by the intentional production or fragmentation of larger plastics. Their accumulation and persistence in the environment, the potential to interact with other pollutants and organisms, as well as altering the abiotic characteristics of ecosystems, can lead to environmental consequences. It is estimated that more than 80 per cent of plastic pollution is transported by rivers to the oceans. However, there is limited knowledge about the contribution of rivers to microplastic pollution. Therefore, the objectives of this project are to investigate the adsorption of organic pollutants on microplastics, including assessing the influence of different constituents and properties of water on these interactions; optimising sampling and analytical techniques for monitoring microplastics in water and; providing training for young scientists and sharing and exchanging scientific knowledge and experience between the Serbian and Portuguese teams.