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Lead Adsorption Characteristics of Polyethylene and Polypropylene Microplastics under Freshwater Conditions
Original title: 담수조건에서 미세플라스틱인 폴리에틸렌과 폴리프로필렌의 납 흡착특성
Summary
This Korean study investigated how polyethylene and polypropylene microplastics adsorb lead in freshwater conditions, finding that these common plastic types can bind significant amounts of this toxic heavy metal — raising concerns about combined plastic and heavy metal contamination in river systems.
In the both marine and freshwater environments, microplastics and heavy metals such as Pb, Cd, Cr and Hg are considered a global threat to various marine and freshwater animals, and the interaction between these two pollutants are poorly understood. Microplastics such as polyethylene and polypropylene have received less attention in the freshwater environments than in the marine environments. The objective of this research was to investigate the Pb absorption capacity by microplastic polyethylene and polypropylene to estimate the Pb adsorption behavior by microplastic in freshwater ecosystems. The Pb adsorption characteristics by polyethylene and polypropylene were evaluated using both the Freundlich and Langmuir adsorption isotherm equations. Langmuir model for polyethylene and polypropylene provides a slightly better fit than the Freundlich model for Pb adsorption in all stages. The results demonstrate that the adsorption characteristic of Pb by polyethylene and polypropylene is mainly monolayer adsorption. The maximum Pb adsorption capacity of polyethylene was higher than that in polypropylene.