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Sorption of organic compounds by aged polystyrene microplastic particles
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Researchers tested the sorption of organic compounds by aged polystyrene microplastic particles and found that weathering increased their sorption capacity, meaning environmental aging makes microplastics more effective at accumulating and transporting pollutants.
Microplastics that are released into the environment undergo aging and interact with other substances such as organic contaminants. Understanding the sorption interactions between aged microplastics and organic contaminants is therefore essential for evaluating the impact of microplastics on the environment. There is little information available on how the aging of microplastics affects their sorption behavior and other properties. We have therefore investigated the effects of an accelerated UV-aging procedure on polystyrene microplastics, which are used in products such as skin cleaners and foams. Physical and chemical particle characterizations showed that aging led to significant surface oxidation and minor localized microcrack formation. Sorption coefficients of organic compounds by polystyrene microplastics following aging were up to one order of magnitude lower than for pristine particles. Sorption isotherms were experimentally determined using a diverse set of probe sorbates covering a variety of substance classes allowing an in-depth evaluation of the poly-parameter linear free-energy relationship (ppLFER) modelling used to investigate the contribution of individual molecular interactions to overall sorption. The ppLFER modelling was validated using internal cross-validation, which confirmed its robustness. This approach therefore yields improved estimates of the interactions between aged polystyrene microplastics and organic contaminants.
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This data article reports the sorption behavior of 21 different chemicals by UV-aged polystyrene microplastics, providing a useful dataset for modeling chemical uptake by weathered plastic in the environment. Aged plastics often absorb more pollutants than fresh plastics, making environmental aging an important factor in assessing microplastic risk.
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Insight into the characteristics and sorption behaviors of aged polystyrene microplastics through three type of accelerated oxidation processes
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Researchers studied how three different UV-based oxidation processes age polystyrene microplastics and how that aging affects the particles' ability to absorb the chemical bisphenol A. They found that aging significantly increased the surface oxidation and water-attracting properties of the microplastics, altering their pollutant-sorbing behavior. The findings suggest that weathered microplastics in the environment may interact with chemical contaminants differently than fresh ones.
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