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

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© The Author(s) 2021

Open Access This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/.

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Microplastic particle abundance on: (a) the Danube River (Iron Gates area); (b) Danube Delta; and (c) Black Sea coast and inner shelf. The concentration is calculated for particles per 1 kg of sediment. (Figures created with the assistance of Cornel Pop, GeoEcoMar, using QGIS 3.4, background data: www.OpenStreetmap.org and https://land.copernicus.eu/).