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Raman Tweezers for Small Microplastics and Nanoplastics Identification in Seawater

Journal article
Authors R. Gillibert
G. Balakrishnan
Q. Deshoules
M. Tardivel
Alessandro Magazzu
M. G. Donato
O. M. Marago
M. L. de La Chapelle
F. Colas
F. Lagarde
P. G. Gucciardi
Science V. P. Rpente.Ej
Published in Environmental Science & Technology
Volume 53
Issue 15
Pages 9003-9013
ISSN 0013-936X
Publication year 2019
Published at Department of Physics (GU)
Pages 9003-9013
Language en
Keywords 20 mu-m, marine-environment, spectroscopy, particles, ingestion, micro, ftir, nanoparticles, aggregation, degradation, Engineering
Subject categories Physical Sciences


Our understanding of the fate and distribution of micro- and nano- plastics in the marine environment is limited by the intrinsic difficulties of the techniques currently used for the detection, quantification, and chemical identification of small particles in liquid (light scattering, vibrational spectroscopies, and optical and electron microscopies). Here we introduce Raman Tweezers (RTs), namely optical tweezers combined with Raman spectroscopy, as an analytical tool for the study of micro- and nanoplastics in seawater. We show optical trapping and chemical identification of sub-20 mu m plastics, down to the 50 nm range. Analysis at the single particle level allows us to unambiguously discriminate plastics from organic matter and mineral sediments, overcoming the capacities of standard Raman spectroscopy in liquid, intrinsically limited to ensemble measurements. Being a microscopy technique, RTs also permits one to assess the size and shapes of particles (beads, fragments, and fibers), with spatial resolution only limited by diffraction. Applications are shown on both model particles and naturally aged environmental samples, made of common plastic pollutants, including polyethylene, polypropylene, nylon, and polystyrene, also in the presence of a thin ecocorona. Coupled to suitable extraction and concentration protocols, RTs have the potential to strongly impact future research on micro and nanoplastics environmental pollution, and enable the understanding of the fragmentation processes on a multiscale level of aged polymers.

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