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Neue SFB 1357 Pressemeldung: Neue Studie untersucht Mikroplastikbelastung in einer Rheinaue bei Köln
18.05.2022
Wir freuen uns, eine Pressemitteilung der Universität Bayreuth zu der unten stehenden Studie bekannt zu geben:
Die Pressemitteilung der UBT finden Sie hier: https://www.uni-bayreuth.de/pressemitteilung/mikroplastik-rheinaue
Neue Studie untersucht Mikroplastikbelastung in einer Rheinaue bei Köln
Mikroplastikpartikel können sich in Flussauen ablagern und in tiefere Bereiche des Bodens eindringen. Die nachgewiesene Anzahl der Partikel hängt dabei insbesondere vom Bewuchs der Bodenoberfläche, der Häufigkeit von Überschwemmungen und der Bodenbeschaffenheit ab. Dies haben Forscher*innen der Universitäten Bayreuth und Köln bei Untersuchungen in der Rheinaue Langel-Merkenich nördlich von Köln herausgefunden. Die in der Zeitschrift „Science of the Total Environment“ veröffentlichte Studie ist aus der interdisziplinären Zusammenarbeit im DFG-Sonderforschungsbereich 1357 „Mikroplastik“ an der Universität Bayreuth hervorgegangen.
Die Autor*innen der Studie sind: Markus Rolf, Hannes Laermanns, Lukas Kienzler, Christian Pohl, Julia N. Möller, Christian Laforsch, Martin G. J. Löder, Christina Bogner.
"Flooding frequency and floodplain topography determine abundance of microplastics in an alluvial Rhine soil"
DOI: https://doi.org/10.1016/j.scitotenv.2022.155141
veröffentlicht in: Science of the Total Environment
Abstract: Rivers are major pathways for the transport of microplastics towards the oceans, and many studies focus on microplastic abundance in fluvial ecosystems. Although flooding strongly affects transport of microplastics, knowledge about the potential input via floodwaters, spatial distribution, and fate of microplastics in adjacent floodplains remains very limited. In this study, we suggest that local topography and flood frequency could influence the abundance of microplastics in floodplains. Based on this concept, we took soil samples in a Rhine River floodplain in two different depths (0–5 cm and 5–20 cm) along three transects with increasing distance to the river and analysed the abundance of microplastics via FTIR spectroscopy. Flood frequency of the transects was estimated by a combination of hydrodynamic modelling with MIKE 21 (DHI, Hørsholm Denmark) and analysis of time series of water levels. Microplastic abundance per kg dry soil varied between 25,502 to 51,119 particles in the top 5 cm and 25,616 to 84,824 particles in the deeper soil (5–20 cm). The results of our study indicate that local topography and resulting flooding patterns are responsible for the amount of microplastics found at the respective transect. Differences in soil properties, vegetation cover and signs of earthworm activity in the soil profile seem to be related to microplastic migration and accumulation in the deeper soil. The interdisciplinary approach we used in our work can be applied to other floodplains to elucidate the respective processes. This information is essentially important both for locating potential microplastic sinks for process-informed sampling designs and to identify areas of increased bioavailability of microplastics for proper ecological risk assessment.