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Could you elaborate on naturally found microplastics?

I meant microplastic concentrations in the real world, i.e. not in a lab.

If the concentrations of those used in a lab are far in excess of those in the real world, then these results may be of less concern.

In the paper they mention a concentration of 20ug/ml. I haven't compared this to what is typical for drinking water, food, etc.

good one haha... nologic but savage... (commenter's handle is nologic, this is supposed to be a pun)