In summary, for whatever reason it seems that nanoparticles of some plastics readily penetrate and accumulate in biological tissues. There are also chemicals that will adsorb onto these nanoparticles. This can make a chemical at a given concentration more toxic to an organism, or even potentially make something toxic that was previously not.
You might try DOI 10.1039/C8NR09321K (https://pubs.rsc.org/en/content/articlelanding/2019/nr/c8nr0...).
In summary, for whatever reason it seems that nanoparticles of some plastics readily penetrate and accumulate in biological tissues. There are also chemicals that will adsorb onto these nanoparticles. This can make a chemical at a given concentration more toxic to an organism, or even potentially make something toxic that was previously not.