Pictures of model systems after shaker (A and C) and poured suspensions (B and D). On the right - scheme of separation of samples into fractions of plastic particles, PS - A, B; PMMA - C, D. Floating PS particles - layer of polystyrene particles floating on solution surface, Sediment 1 - sediment after centrifugation at 100 g, 30 min; Sediment 2 - sediment after centrifugation at 4000 g, 30 min. Dispersion 2 - liquid phase after centrifugation at 4000 g. Dispersions 3 and 4 were obtained by filtering Dispersion 2 with 1.2 and 0.45 μm filters, respectively.