Saxony is particularly affected by microplastics as a federal state with several cross-border waters and as a transit country for passenger and truck traffic (tyre abrasion). The aim of the project is to investigate the occurrence and behaviour of microplastics in Saxon waters. This includes the investigation of the sole sediments of border rivers such as the Elbe and Neisse as well as the transport of particles in the water. For the quantification and characterisation of microplastics, a method of sample preparation using electrostatic sorting is further developed and a calorimetric method of analysis for practical use is adapted and calibrated. On the basis of the subsequent processing of a sufficient number of sediment samples as well as tribochemical laboratory tests, the balance of material transport and the assessment of behaviour are carried out. Four young researchers are led to a doctorate. In order to transfer the method, we cooperate closely with the State Operating Company for the Environment and Agriculture, through the development of a sampling, sample preparation and analysis provision, up to training and further training throughout the entire region. A project website, student experiments and a travelling exhibition will provide visibility, especially for the target group of young students, graduates and young engineers in practice.