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. 2021 Sep 23;806:150495. doi: 10.1016/j.scitotenv.2021.150495

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Fig. 2 — Comparison of Fourier transform infrared spectroscopy (FT-IR) spectra from face masks of different fabrics, microfibers plucked by each face masks and microfibers collected after laundering. PA = polyamide; PL = polyester; PP = polypropylene; PU = polyurethane; CO = cotton; Sf = surgical face mask (PP fabric).