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Photolysis of polycyclic aromatic hydrocarbons adsorbed on polyethylene microplastics
Summary
Researchers investigated the photolysis of polycyclic aromatic hydrocarbons adsorbed onto polyethylene microplastics under natural sunlight conditions, finding that PAH concentrations on microplastic surfaces decreased over time due to photodegradation. The study provides first data on the environmental fate of PAH-microplastic complexes under realistic solar irradiation.
Contaminants adsorbed on microplastics (MPs) are a potential risk to aquatic environments. Several studies have demonstrated that polycyclic aromatic hydrocarbons (PAHs), which adsorb on MPs, can be photolyzed in aqueous solutions. We investigated photolysis of PAHs on MPs under sunlight conditions to estimate their environmental fate for the first time. The PAHs (25 ng each) were added to polyethylene powder, which was used as the MP sample. The MP sample was agitated in water with sunlight irradiation; thereafter, the concentration of the PAHs on the MP sample was determined by high-pressure liquid chromatography with a fluorescence detector. The half-life values of the PAHs were estimated between 3.4 × 10 (pyrene) and 3.2 × 10 min (benz[j]fluoranthene). These values are 0.5 (fluoranthene) to 25 (benzo[a]pyrene) times larger than those in the aqueous phase. Additionally, the degradation of PAHs by OH radicals produced by the photolysis of nitrate was observed.