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Riverine Microplastic Loading to Mersin Bay, Turkey on the North-eastern Mediterranean
Summary
Researchers characterized microplastics in eight rivers discharging into Mersin Bay in the northeastern Mediterranean, finding fibres dominated at 83.5% of particles and calculating a total load of approximately 1,200 billion particles delivered to the bay. Microplastic characteristics in the rivers closely matched those previously documented in the marine environment of Mersin Bay.
Microplastics sampled downstream from a total of eight rivers were analysed as the first attempt to determine microplastic composition in rivers and load to Mersin Bay, in the north-eastern Mediterranean Sea. With a share of 83.5%, fibres were the dominant category from all samples. Basic characteristics (form, colour, average size, polymer) of microplastics from these rivers were similar to those reported from the marine environment in Mersin bay. The overall average number of microplastics calculated for the eight rivers was determined as 293±59 particles/m3 equalling a load of 1200 billion items (mainly from the Göksu River) discharged annually to the north-eastern Mediterranean. This value equivalent to twice the total stock of microplastics within the water column in Mersin Bay, demonstrates that rivers are a primary source of microplastics pollution for the coastal seas.
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