Identification and Quantification of Microplastics in the Marine Environment Using the Laser Direct Infrared (LDIR) Technique
Type | Article | ||||||||||||||||
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Date | 2022-07 | ||||||||||||||||
Language | English | ||||||||||||||||
Author(s) | Ourgaud Mélanie1, Phuong Nam Ngoc1, 2, Papillon Laure1, Panagiotopoulos Christos1, Galgani Francois3, Schmidt Natascha1, Fauvelle Vincent1, Brach-Papa Christophe3, Sempéré Richard1 | ||||||||||||||||
Affiliation(s) | 1 : Aix-Marseille University, Toulon University, CNRS, IRD, M I O, Marseille 13007, France 2 : PhuTho College of Medicine and Pharmacy, 2201 Hung Vuong Boulevard, Viettri City, PhuTho Province 290000, Viet Nam 3 : Laboratoire Environnement Ressources, Provence-Azur-Corse, IFREMER, Centre Méditerranée, Zone Portuaire de Brégaillon, CS20 330, 83507, La Seyne-sur-Mer Cedex, France |
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Source | Environmental Science & Technology (0013-936X) (American Chemical Society (ACS)), 2022-07 , Vol. 56 , N. 14 , P. 9999-10009 | ||||||||||||||||
DOI | 10.1021/acs.est.1c08870 | ||||||||||||||||
WOS© Times Cited | 32 | ||||||||||||||||
Keyword(s) | Microplastics, LDIR, detection, seawater, sediment, marine organisms | ||||||||||||||||
Abstract | Here, we evaluate for the first time the performances of the newly developed laser direct infrared (LDIR) technique and propose an optimization of the initial protocol for marine microplastics (MPs) analysis. Our results show that an 8 μm porosity polycarbonate filter placed on a Kevley slide enables preconcentration and efficient quantification of MPs, as well as polymer and size determination of reference plastic pellets of polypropylene (PP), polyethylene (PE), polystyrene (PS), polyvinyl chloride (PVC), and polyethylene terephthalate (PET), with recoveries ranging from 80–100% and negligible blank values for particle sizes ranging from 200 to 500 μm. A spiked experiment using seawater, sediment, mussels, and fish stomach samples showed that the method responded linearly with significant slopes (R2 ranging from 0.93–1.0; p < 0.001, p < 0.01). Overall, 11 polymer types were identified with limited handling and an analysis time of ca. 3 h for most samples and 6 h for complex samples. Application of this technique to Mediterranean marine samples (seawater, sediment, fish stomachs and mussels) indicated MP concentrations and size distribution consistent with the literature. A high predominance of PVC (sediment, fish stomachs) and PE and PP (seawater, mussels) was observed in the analyzed samples. |
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