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Sedimentary microplastic concentrations from the Romanian Danube River to the Black Sea
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Researchers measured microplastic concentrations in sediments along the Danube River through the Danube Delta and into the Black Sea, finding that some isolated areas of the Delta still had relatively few plastic particles. The study helps clarify how microplastics move from major rivers into the ocean, an important step for estimating global ocean plastic loads.
A multitude of recent studies have detailed microplastic concentrations in aquatic and terrestrial environments, although questions remain over their ultimate fate. At present, few studies have detailed microplastic characteristics and abundance along a freshwater-marine interface, and considerable uncertainties remain over the modelled contribution of terrestrial and riverine microplastic to the world's oceans. In this article, for the first time, we detail sedimentary microplastic concentrations along a River-Sea transect from the lower reaches of a major continental river, the River Danube, through the Danube Delta, the Black Sea coast to the Romanian and Bulgarian inner shelf of the Black Sea. Our results indicate that isolated areas of the Danube Delta are still relatively pristine, with few microplastic particles in some of the sediments sampled.
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Researchers collected surface water samples from the Western Black Sea near the Danube Delta and Romanian shore, finding micro-, meso-, and macroplastic particles that may contribute significantly to Mediterranean marine pollution via the connecting waterway. Organic matter was digested and plastic particles were isolated and characterised to quantify and identify the polymer types present.
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This IAHR-affiliated study assessed microplastic contamination in the Hungarian section of the Danube River, contributing experimental data on plastic particle abundance and distribution in one of Europe's major river systems. River microplastic data from the Danube are particularly important as this river drains a large European catchment and ultimately discharges into the Black Sea.
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Research digests by email
When a large batch of papers lands in the Atlas, we read through it and send a short write-up of what stood out.