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Raman spectra of individual microplastic particles recorded in tap water streaming with 1 L/h through the flow cell: (A) as recorded; (B) after background removal and smoothing. The shaded spectral range contains the Raman lines used for identifying polymers. Integration time Topt = Teff = 33 ms; beam width within the flow cell: 1 mm; laser power within the flow cell: 1.54 W/mm2. The spectra were stacked for visibility.
