JALON ROJAS, Isabel; ROMERO-RAMIREZ, Alicia; FAUQUEMBERGUE, Kelly; ROSSIGNOL, Linda; CACHOT, Jérôme; SOUS, Damien; MORIN, Benedicte

doi:10.1021/acs.est.2c01302

Environnements et Paléoenvironnements OCéaniques [EPOC]

ROMERO-RAMIREZ, Alicia

FAUQUEMBERGUE, Kelly

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Article de revue

Ce document a été publié dans

Environmental Science and Technology. 2022-06-21, vol. 56, n° 12, p. 8114-8123

Résumé en anglais

Vertical dynamics of microplastics (MPs) in the water column are complex and not fully understood due to the diversity of environmental MPs and the impact of weathering and biofouling on their dynamical properties. In this study, we investigate the effects of the particle properties and biofilm on the vertical (settling or rising) velocity of microplastic sheets and fibers under laboratory conditions. The experiments focus on three types of MPs (polyester PES fibers, polyethylene terephthalate PET sheets, and polypropylene PP sheets) of nine sizes and two degrees of biological colonization. Even though pristine PES fibers and PET sheets had a similar density, the sinking velocity of fibers was much smaller and independent of their length. The settling or rising velocity of sheets increased with the particle size up to a threshold and then decreased in the wake of horizontal oscillations in large particles. Biofilms had unexpected effects on vertical velocities. Irregular biofilm distributions can trigger motion instabilities that decrease settling velocities of sheets despite the increase in density. Biofilms can also modify the orientation of fibers, which may increase their settling velocity. Finally, we selected the most performant theoretical formulation for each type of particle and proposed modifications to consider the effect of biofilm distribution.< Réduire

Mots clés en anglais

Microplastics

Vertical velocity

Biofilm

Physical properties

Transport

URI

https://oskar-bordeaux.fr/handle/20.500.12278/170308

DOI

http://dx.doi.org/10.1021/acs.est.2c01302

Unités de recherche

EPOC : Environnements et Paléoenvironnements Océaniques et Continentaux - UMR 5805

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Effects of Biofilms and Particle Physical Properties on the Rising and Settling Velocities of Microplastic Fibers and Sheets

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Résumé en anglais

Mots clés en anglais

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Unités de recherche