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(a) UV–Vis absorption spectra of the aqueous dispersion of label-free PET nanoparticles, distilled water, and, for comparison purposes, the references spectrum of PET dissolved in hexafluoroisopropanol (HIPF) reported by Sonnenschein et al. [53]. (b) Fluorescence of label-free PET microplastics (left vial) and label-free nanoplastic dispersion (right vial) under UV irradiation at 365 nm (distilled water in the center vial).
