Comparative analysis of microplastics detection methods applied to marine sediments: A case study in the Bay of Marseille

Gerigny, Olivia; Blanco, Gustavo; Lips, Urmas; Buhhalko, Natalja; Chouteau, Leelou; Georges, Elise; Meyers, Nelle; Vanavermaete, David; Galgani, François; Ourgaud, Melanie; Papillon, Laure; Sempéré, Richard; De Witte, Bavo; Ministry of Climate; Agence Nationale de la Recherche; Belgian Science Policy Office; Agencia Estatal de Investigación; Ministerio de Ciencia, Innovación y Universidades

Comparative analysis of microplastics detection methods applied to marine sediments: A case study in the Bay of Marseille

2024

An intercomparison exercise on “microplastics in sediment” was carried out by five laboratories using samples collected in the Bay of Marseille in September 2021. The results from different extraction and identification methods varied depending on the type and size classes of MPs, and was better than 80 % for the size class >300 μm and for the fragments. The variability in recovery rates can be attributed to the choice of reagents and extraction protocols. Recovery rates per laboratory were between 47 % and 113 % and the use of ZnCl2 and NaI increased recovery rates by an average of 70 %. The lowest recovery rates (47 and 53 %) were attributed to the reference methods (FTIR and LDIR), conversely the highest (80 and 87 %) were attributed to identification by Nile Red. The average ranged between 23 and 53 items /50 g d.w. with decreases offshore and at greater depth.

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This work has been undertaken as part of the JPI Oceans Andromeda project, which was specifically supported with funding from the Ministry of the Environment of Estonia (MoE), the French Agence Nationale de la Recherche (ANR-19-JOCE-0002-01), the Belgian Science Policy Office (BELSPO) [contract no B2/20E/P1/Andromeda], and the Spanish Ministry of Science, Innovation and Universities (MICIU) [project PCI2020–112047].

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Peer reviewed

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