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Microplastic pollution is a growing global concern across terrestrial, marine and freshwater environments. It is welldocumented that a number of organic contaminants are also associated with microplastics in the environment. In a controlled experiment, this study documents the equilibrium sorption potential of 32 persistent organic pollutants, representing different pesticides and polychlorinated biphenyls (PCBs), to the six most commonly-used plastic polymers. Results showed that sorption rates, measured as sorption recoveries or percent return, for individual contaminants varied widely. However, the plastic polymers polyvinyl chloride (PVC) and low-density polyethylene (LDPE) showed the highest average sorption recoveries for PCBs, while LDPE also showed the highest average sorption recoveries for pesticides. The lowest average sorption recoveries for both pesticides and PCBs were observed in the polymer polyethylene terephthalate (PET). Given that these contaminants have high persistence, toxicity and bioaccumulation potential, the results of this study can serve as a guide to industry, government and other stakeholders for prioritizing additional research or regulation for polymers that may pose a higher risk to aquatic ecosystems and human health, due to their higher contaminant sorption potential.

Variations in Sorption of Organochlorine Pesticides and PCBs across Six Different Plastic Polymers