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. 2021 Jan 21;11:2000. doi: 10.1038/s41598-021-81724-4

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Microplastic particle abundance in the collected samples from the Danube River (left) to the Black Sea (right), showing the concentration in particles per 1 kg (green) and particles per 0.5 L (purple) of sediment. Also indicated are water level (blue) and sample elevation (red).