Capillary Electrophoresis as a Complementary Analytical Tool for the Separation and Detection of Nanoplastic Particles.

23 Figure 1 a shows a typical electropherogram for the separation of an aqueous mixture of five different PS sizes, from 30 to 300 nm, at a concentration range of 10 09 –10 12 particles mL –1 , with an increasing trend in migration time along with size, verified by prior separate injections for 30, 60, 90, 200, and 300 nm.

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It was found that the negative SCD magnitude follows a decreasing trend when particle size increases, in a similar way to that reported in the literature for spherical NPs. 34 Similar effects have also been recently observed in microparticles. 16 A sharp drop in SCD can be observed for the smaller particles, and for larger particles beyond 300 nm, SCD may reach a plateau and become almost independent of size.

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