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Passive labeling and fluorescent imaging of various nanoplastic types with Atto 647N. Confocal (a) and STED (b) images of debris released from an expanded polystyrene plate exposed to 90 °C in DI water; (c) confocal and (d) STED image of sanding debris from a polystyrene Petri dish; (e) confocal and (f) STED images of PTFE particles; and (g) confocal and (h) STED images of PMMA particles. Confocal and STED images are of the same field of view.
