Detection and characterisation of microplastics in lake sediments: A study in the Zagreb region

Microplastics (MPs) pose a significant threat to terrestrial and aquatic ecosystems due to their widespread distribution and persistence. This study analyses the presence, types and quantities of MPs in lake sediments in the Zagreb region of Croatia. Sediment samples were collected from four lakes and subjected to density separation (ZnCl2) and filtration (5 µm filters) to isolate MP particles. Micro-Raman spectroscopy with a mapping function was used to quantify and characterise the MPs, which revealed that the predominant polymer types were polystyrene, polyethylene, polyethylene terephthalate, polypropylene and nylon (Fig. 1). The results show that MPs were present in all lake sediments and their total number was between 113,000 and 764,000 MP kg-1 of sediment. The majority of the MPs were in the range of 5 to 10 µm (i.e. small MP). These results highlight the widespread presence of MPs in inland waters and emphasise the need for further research and effective strategies to combat MP pollution. Understanding the occurrence and characteristics of MPs in lake sediments is crucial for the protection of freshwater ecosystems and their associated biota. This study provides insights into the landscape of MP pollution, sheds light on previously understudied regions and provides clues for future research and protection measures. Also see: https://micro2024.sciencesconf.org/556184/document