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Quantifying surface topography helps reveal the combined effects of microplastics UV-aging and organic matter on trace metal adsorption in seawater.
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Sunlight exposure makes ocean microplastics rougher and more weathered, and this new study shows that "aged" plastic actually soaks up more toxic metals like copper and lead compared to fresh plastic. Since microplastics are found throughout seafood and drinking water, this matters because sun-damaged plastic particles could be carrying higher loads of harmful metals into the food chain than we previously realized.
This study explores the impact of UV-aging and organic matter (humic acid - HA) on adsorption of essential (Cu, Co, Ni) and nonessential (Cd, Pb) trace metals onto microplastics (MPs), polypropylene (PP) and polystyrene (PS), in seawater. Surface characterization using atomic force microscopy (AFM), Fourier-transform infrared spectroscopy (FTIR), and scanning electron microscopy (SEM) revealed that UV aging significantly alters microplastic surface properties. AFM measurements show an increase in both surface roughness and surface area under UV radiation. This increase strongly correlated with enhanced metal adsorption, with uptake varying according to polymer type and aging state. Surface transformations upon prolonged MPs aging significantly altered the preferences of Cd, Co and Cu in adsorption dynamics. Cu and Pb showed the highest adsorbed amounts, especially on aged microplastics. The influence of HA was metal-specific and dependent on the aging state of the microplastics. HA had no significant effect on Cd, Co, Ni and Pb, but modulated Cu adsorption, enhancing it on unaged MPs and reducing it on aged MPs, which was consistent with the speciation modeling. This work is the first to assess the combined effects of organic matter and aged MPs on the adsorption of Cd, Co, and Ni in seawater, and to employ AFM for microplastic quantitative surface topography in such context.
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Researchers found that microplastics aged by UV sunlight are better at absorbing and carrying lead (a toxic heavy metal) through soil and water than fresh microplastics. The aging process changes the microplastic surface in ways that make it grab onto more lead, potentially spreading this toxic metal further through the environment. This is relevant to human health because aged microplastics in the real world may be transporting more heavy metals into water supplies and food-growing soil than previously thought.
Heavy metal adsorption by pristine and aged microplastics: A focused evidence synthesis
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This review of existing studies found that once microplastics break down and "age" in the environment (from sun exposure, weathering in water, etc.), they actually become better at soaking up toxic heavy metals like lead and copper compared to fresh, unweathered plastic. This matters because most microplastics in nature have already been weathered by the time they reach our water, food, or bodies, so testing only "new" plastic likely underestimates how much heavy metal contamination they can carry and potentially expose us to.
Aging of microplastics increases their adsorption affinity towards organic contaminants
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Researchers found that microplastics that have been weathered by sunlight and environmental exposure absorb significantly more chemical pollutants than fresh microplastics, with up to a 4.7-fold increase in adsorption. Ultraviolet exposure changes the surface chemistry of the plastics, making them stickier for contaminants. This matters because most microplastics in nature are weathered, meaning they may be carrying more toxic chemicals into the food chain than laboratory studies using new plastics would suggest.
Adsorption behavior of Cu(II) on UV-aged polyethylene terephthalate and polypropylene microplastics in aqueous solution
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Researchers studied how UV aging changes the ability of PET and polypropylene microplastics to adsorb copper ions from water. UV exposure altered the surface properties of both plastics, increasing their capacity to bind heavy metals compared to pristine particles. The findings suggest that weathered microplastics in the environment may be more effective at concentrating toxic metals, potentially increasing ecological risks in contaminated waterways.
Adsorption properties and mechanism of Cu(II) on virgin and aged microplastics in the aquatic environment
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Researchers examined how UV aging changes the surface properties of polyamide and polylactic acid microplastics and affects their ability to adsorb copper ions in water. The study found that UV irradiation altered the physical and chemical characteristics of both plastic types, increasing their capacity to bind heavy metals. Evidence indicates that weathered microplastics may act as more effective carriers of heavy metal contaminants in aquatic environments compared to virgin plastics.
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