Microplastics in Scanian wetlands : Sege river & Kävlinge river

Abstract: It is estimated that 75 million tons of plastics waste is currently in the ocean and expects to increase in line with plastic consumption. Plastic items in natural or aquatic environments are fragmented into smaller pieces called microplastics. Microplastics can enter rivers and lakes through sewage water to end up in wetlands where they sediment. Due to lack of standard monitoring tools, microplastics in a Scanian context are rather uninvestigated. The current work therefore studies microplastics’ abundance in eleven wetlands along the Sege river and Kävlinge river. The aim is with available methods and tools to examine microplastics in sediment and examine if determined microplastics concentrations can relate to urbanization in the two catchments. The study also looked into wetlands position in relation to stream order to test if microplastics concentrations increase downstream. In the study, density separation has been used to extract microplastics from soil samples and analyzed using correlation. The result showed microplastics concentrations in all sampling sites. There was weak negative or no correlation with degree of urbanization nor a relation to higher concentration further downstream along Sege river and Kävlinge river. However, the study concludes that microplastics do appear in Scanian wetlands and not necessarily in the vicinity of human activity which complies with microplastics' ability to travel long distances.