Sediment trapping - An attempt to monitor temporal variation of microplastic flux rates in aquatic systems

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Saarni , S , Hartikainen , S , Meronen , S , Uurasjarvi , E , Kalliokoski , M & Koistinen , A 2021 , ' Sediment trapping - An attempt to monitor temporal variation of microplastic flux rates in aquatic systems ' , Environmental Pollution , vol. 274 , 116568 . https://doi.org/10.1016/j.envpol.2021.116568

Title: Sediment trapping - An attempt to monitor temporal variation of microplastic flux rates in aquatic systems
Author: Saarni, Saija; Hartikainen, Samuel; Meronen, Senja; Uurasjarvi, Emilia; Kalliokoski, Maarit; Koistinen, Arto
Contributor organization: Ecosystems and Environment Research Programme
Date: 2021-04-01
Language: eng
Number of pages: 9
Belongs to series: Environmental Pollution
ISSN: 0269-7491
DOI: https://doi.org/10.1016/j.envpol.2021.116568
URI: http://hdl.handle.net/10138/329094
Abstract: Sediment trapping as a tool to monitor microplastic influx was tested in an urban boreal lake basin. The one-year-long trap monitoring consisted of 5-month and 7-month periods representing growing season and winter season (including the spring flood event), respectively. Sediment accumulation rate (SAR), and organic content were determined, highest SAR - 14.5 g/m(2)/d - was measured during the winter period. Microplastics were extracted from the sediment applying heavy-liquid density separation method and collected under a microscope for further identification with FTIR spectroscopy. PE was identified as the most abundant synthetic polymer type, while PP and PET are also present. The annual microplastic flux rate is 32 400 pieces/m2/ year, and highest accumulation does not coincide with the highest SAR, but occurs during the growing season. Changes in the microplastic accumulation rates are related to seasonal conditions. Highest microplastic concentration with respect to dry sediment weight (10 200 pieces/kg) was observed in a growing season sample, while highest concentration with respect to sediment volume (1800 pieces/l) was observed during winter. This finding underlines the problems related to reporting microplastic concentrations in various units. The results highlight that sediment trap monitoring is an efficient tool for monitoring microplastic accumulation rate in aquatic environments and provides an opportunity to better understand and define processes controlling microplastic accumulation. (C) 2021 The Authors. Published by Elsevier Ltd. This is an open access article under the CC BY-NC-ND license
Subject: Microplastics
Accumulation rate
Sediment trap
Sedimentation process
Urban lake
1172 Environmental sciences
Peer reviewed: Yes
Rights: cc_by_nc_nd
Usage restriction: openAccess
Self-archived version: publishedVersion


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